深海游弋的鱼 – 第 2 页

Caught error: Unsupported operation: Platform._operatingSystem

Flutter 代码运行在 Chrome 上的时候报错 “Caught error: Unsupported operation: Platform._operatingSystem”。

报错的原因是因为代码中使用了 Platform.isIOS、Platform.isAndroid 等函数判断系统类型，可惜的是，这些函数并不能在 Chrome 上运行。

修改方法就是自己封装一个自定义工具类，先使用 kIsWeb 排除一下浏览器。参考如下：

import 'dart:io';

import 'package:flutter/foundation.dart';

class PlatformKit {
  /// 是否是移动设备，如果系统是 Android 、iOS 则返回 true 否则返回 false
  static bool isMobile() {
    return (!kIsWeb) && (Platform.isAndroid || Platform.isIOS);
  }

  /// 是否是macOS，如果系统 macOS 则返回 true 否则返回 false
  static bool isMacOS() {
    return (!kIsWeb) && Platform.isMacOS;
  }
}

import 'dart:io';

import 'package:flutter/foundation.dart';

class PlatformKit {

/// 是否是移动设备，如果系统是 Android 、iOS 则返回 true 否则返回 false

static bool isMobile() {

return (!kIsWeb) && (Platform.isAndroid || Platform.isIOS);

}

/// 是否是macOS，如果系统 macOS 则返回 true 否则返回 false

static bool isMacOS() {

return (!kIsWeb) && Platform.isMacOS;

}

参考链接

Flutter Web 警告 Local variable for "serviceWorkerVersion" is deprecated

升级到 Flutter 3.22.0 之后，在 Chrome 上运行 Flutter Web 应用程序时收到以下警告：

Launching lib/main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...
Warning: In index.html:40: Local variable for "serviceWorkerVersion" is deprecated. Use "{{flutter_service_worker_version}}" template token instead. See https://docs.flutter.dev/platform-integration/web/initialization for more details.

Launching lib/main.dart on Chrome in debug mode...

Waiting for connection from debug service on Chrome...

Warning: In index.html:40: Local variable for "serviceWorkerVersion" is deprecated. Use "{{flutter_service_worker_version}}" template token instead. See https://docs.flutter.dev/platform-integration/web/initialization for more details.

这个警告的原因是，新版本的 Flutter Web 应用加载 service_worker.js 的方式发生了变化，原来的加载脚本被 {{flutter_bootstrap_js}} 替代。

调整为新的初始化代码即可解决此问题。

原始的代码如下：

<!DOCTYPE html>
<html>
<head>
  <!--
    If you are serving your web app in a path other than the root, change the
    href value below to reflect the base path you are serving from.

    The path provided below has to start and end with a slash "/" in order for
    it to work correctly.

    For more details:
    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base

    This is a placeholder for base href that will be replaced by the value of
    the `--base-href` argument provided to `flutter build`.
  -->
  <base href="$FLUTTER_BASE_HREF">

  <meta charset="UTF-8">
  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
  <meta name="description" content="A new Flutter project.">

  <!-- iOS meta tags & icons -->
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <meta name="apple-mobile-web-app-title" content="xxxx">
  <link rel="apple-touch-icon" href="icons/Icon-192.png">

  <!-- Favicon -->
  <link rel="icon" type="image/png" href="favicon.png"/>

  <title>xxxx</title>
  <link rel="manifest" href="manifest.json">
</head>
<body>
  <!-- This script installs service_worker.js to provide PWA functionality to
       application. For more information, see:
       https://developers.google.com/web/fundamentals/primers/service-workers -->
  <script>
    var serviceWorkerVersion = null;
    var scriptLoaded = false;
    function loadMainDartJs() {
      if (scriptLoaded) {
        return;
      }
      scriptLoaded = true;
      var scriptTag = document.createElement('script');
      scriptTag.src = 'main.dart.js';
      scriptTag.type = 'application/javascript';
      document.body.append(scriptTag);
    }

    if ('serviceWorker' in navigator) {
      // Service workers are supported. Use them.
      window.addEventListener('load', function () {
        // Wait for registration to finish before dropping the <script> tag.
        // Otherwise, the browser will load the script multiple times,
        // potentially different versions.
        var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
        navigator.serviceWorker.register(serviceWorkerUrl)
          .then((reg) => {
            function waitForActivation(serviceWorker) {
              serviceWorker.addEventListener('statechange', () => {
                if (serviceWorker.state == 'activated') {
                  console.log('Installed new service worker.');
                  loadMainDartJs();
                }
              });
            }
            if (!reg.active && (reg.installing || reg.waiting)) {
              // No active web worker and we have installed or are installing
              // one for the first time. Simply wait for it to activate.
              waitForActivation(reg.installing || reg.waiting);
            } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
              // When the app updates the serviceWorkerVersion changes, so we
              // need to ask the service worker to update.
              console.log('New service worker available.');
              reg.update();
              waitForActivation(reg.installing);
            } else {
              // Existing service worker is still good.
              console.log('Loading app from service worker.');
              loadMainDartJs();
            }
          });

        // If service worker doesn't succeed in a reasonable amount of time,
        // fallback to plaint <script> tag.
        setTimeout(() => {
          if (!scriptLoaded) {
            console.warn(
              'Failed to load app from service worker. Falling back to plain <script> tag.',
            );
            loadMainDartJs();
          }
        }, 4000);
      });
    } else {
      // Service workers not supported. Just drop the <script> tag.
      loadMainDartJs();
    }
  </script>
</body>
</html>

100

101

102

103

104

<!DOCTYPE html>

<html>

<head>

<!--

If you are serving your web app in a path other than the root, change the

href value below to reflect the base path you are serving from.

The path provided below has to start and end with a slash "/" in order for

it to work correctly.

For more details:

* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base

This is a placeholder for base href that will be replaced by the value of

the `--base-href` argument provided to `flutter build`.

-->

</head>

<body>

<!-- This script installs service_worker.js to provide PWA functionality to

application. For more information, see:

https://developers.google.com/web/fundamentals/primers/service-workers -->

var serviceWorkerVersion = null;

var scriptLoaded = false;

function loadMainDartJs() {

if (scriptLoaded) {

return;

}

scriptLoaded = true;

var scriptTag = document.createElement('script');

scriptTag.src = 'main.dart.js';

scriptTag.type = 'application/javascript';

document.body.append(scriptTag);

}

if ('serviceWorker' in navigator) {

// Service workers are supported. Use them.

window.addEventListener('load', function () {

// Wait for registration to finish before dropping the <script> tag.

// Otherwise, the browser will load the script multiple times,

// potentially different versions.

var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;

navigator.serviceWorker.register(serviceWorkerUrl)

.then((reg) => {

function waitForActivation(serviceWorker) {

serviceWorker.addEventListener('statechange', () => {

if (serviceWorker.state == 'activated') {

console.log('Installed new service worker.');

loadMainDartJs();

}

});

}

if (!reg.active && (reg.installing || reg.waiting)) {

// No active web worker and we have installed or are installing

// one for the first time. Simply wait for it to activate.

waitForActivation(reg.installing || reg.waiting);

} else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {

// When the app updates the serviceWorkerVersion changes, so we

// need to ask the service worker to update.

console.log('New service worker available.');

reg.update();

waitForActivation(reg.installing);

} else {

// Existing service worker is still good.

console.log('Loading app from service worker.');

loadMainDartJs();

}

});

// If service worker doesn't succeed in a reasonable amount of time,

// fallback to plaint <script> tag.

setTimeout(() => {

if (!scriptLoaded) {

console.warn(

'Failed to load app from service worker. Falling back to plain <script> tag.',

);

loadMainDartJs();

}

}, 4000);

});

} else {

// Service workers not supported. Just drop the <script> tag.

loadMainDartJs();

}

</script>

</body>

</html>

调整后的代码如下：

<!DOCTYPE html>
<html>
<head>
  <!--
    If you are serving your web app in a path other than the root, change the
    href value below to reflect the base path you are serving from.

    The path provided below has to start and end with a slash "/" in order for
    it to work correctly.

    For more details:
    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base

    This is a placeholder for base href that will be replaced by the value of
    the `--base-href` argument provided to `flutter build`.
  -->
  <base href="$FLUTTER_BASE_HREF">

  <meta charset="UTF-8">
  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
  <meta name="description" content="A new Flutter project.">

  <!-- iOS meta tags & icons -->
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <meta name="apple-mobile-web-app-title" content="xxxx">
  <link rel="apple-touch-icon" href="icons/Icon-192.png">

  <!-- Favicon -->
  <link rel="icon" type="image/png" href="favicon.png"/>

  <title>xxxx</title>
  <link rel="manifest" href="manifest.json">
</head>
<body>
  <!-- This script installs service_worker.js to provide PWA functionality to
       application. For more information, see:
       https://developers.google.com/web/fundamentals/primers/service-workers -->
    <script>
      {{flutter_bootstrap_js}}
    </script>
</body>
</html>

<!DOCTYPE html>

<html>

<head>

<!--

If you are serving your web app in a path other than the root, change the

href value below to reflect the base path you are serving from.

The path provided below has to start and end with a slash "/" in order for

it to work correctly.

For more details:

* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base

This is a placeholder for base href that will be replaced by the value of

the `--base-href` argument provided to `flutter build`.

-->

</head>

<body>

<!-- This script installs service_worker.js to provide PWA functionality to

application. For more information, see:

https://developers.google.com/web/fundamentals/primers/service-workers -->

</script>

</body>

</html>

参考链接

Flutter error G5FE39F1E: Type 'UnmodifiableUint8ListView' not found

问题描述

原本在 macOS 开发的项目，现在 Windows 10 运行时报如下错误：

Building Windows application...
/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(32,9): error G5FE39F1E: Type 'UnmodifiableUint8ListView' not found. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]
/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(32,9): error G027421CC: 'UnmodifiableUint8ListView' isn't a type. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]
/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(52,17): error G311314CC: Method not found: 'UnmodifiableUint8ListView'. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]
/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(56,31): error G311314CC: Method not found: 'UnmodifiableUint8ListView'. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]
/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(100,17): error G311314CC: Method not found: 'UnmodifiableUint8ListView'. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]
D:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(254,5): error MSB8066: “D:\Source\xxxx\build\windows\x64\CMakeFiles\3280cb0897b7497e569be324d43ba4f0\flutter_windows.dll.rule;D:\Source\xxxx\build\windows\x64\CMakeFiles\7cbe39a26ff33b9ec6d721697d74fbd8\flutter_assemble.rule”的自定义生成已退出，代码为 1。 [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]
Error: Build process failed.

Building Windows application...

/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(32,9): error G5FE39F1E: Type 'UnmodifiableUint8ListView' not found. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]

/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(32,9): error G027421CC: 'UnmodifiableUint8ListView' isn't a type. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]

/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(52,17): error G311314CC: Method not found: 'UnmodifiableUint8ListView'. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]

/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(56,31): error G311314CC: Method not found: 'UnmodifiableUint8ListView'. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]

/C:/Users/Administrator/AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/win32-5.5.0/lib/src/guid.dart(100,17): error G311314CC: Method not found: 'UnmodifiableUint8ListView'. [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]

D:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(254,5): error MSB8066: “D:\Source\xxxx\build\windows\x64\CMakeFiles\3280cb0897b7497e569be324d43ba4f0\flutter_windows.dll.rule;D:\Source\xxxx\build\windows\x64\CMakeFiles\7cbe39a26ff33b9ec6d721697d74fbd8\flutter_assemble.rule”的自定义生成已退出，代码为 1。 [D:\Source\xxxx\build\windows\x64\flutter\flutter_assemble.vcxproj]

Error: Build process failed.

解决方法

$ flutter pub upgrade win32
 
$ flutter pub cache clean
 
$ flutter channel stable
 
$ flutter clean && flutter pub get
 
$ flutter pub upgrade

$ flutter pub upgrade win32

$ flutter pub cache clean

$ flutter channel stable

$ flutter clean && flutter pub get

$ flutter pub upgrade

参考链接

Flutter Error: Type ‘UnmodifiableUint8ListView‘ not found

Flutter调试 iOS 真机卡在启动页面，报错 “try setting IDEPreferLogStreaming=YES”

最近，Flutter 升级到最新版本之后，iOS 真机调试的时候持续卡住在启动页面。

Xcode 输出如下报错信息：

Logging Error: Failed to initialize logging system. Log messages may be missing. If this issue persists, try setting IDEPreferLogStreaming=YES in the active scheme actions environment variables.

1	Logging Error: Failed to initialize logging system. Log messages may be missing. If this issue persists, try setting IDEPreferLogStreaming=YES in the active scheme actions environment variables.

Flutter 系统信息如下：

$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.22.0, on macOS 14.5 23F79 darwin-arm64, locale zh-Hans-CN)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2023.3)
[✓] IntelliJ IDEA Ultimate Edition (version 2018.3.6)
[✓] IntelliJ IDEA Community Edition (version 2024.1)
[✓] VS Code (version 1.89.0)
[✓] Connected device (4 available)
[✓] Network resources

• No issues found!

$ flutter doctor

Doctor summary (to see all details, run flutter doctor -v):

[✓] Flutter (Channel stable, 3.22.0, on macOS 14.5 23F79 darwin-arm64, locale zh-Hans-CN)

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)

[✓] Xcode - develop for iOS and macOS (Xcode 15.3)

[✓] Chrome - develop for the web

[✓] Android Studio (version 2023.3)

[✓] IntelliJ IDEA Ultimate Edition (version 2018.3.6)

[✓] IntelliJ IDEA Community Edition (version 2024.1)

[✓] VS Code (version 1.89.0)

[✓] Connected device (4 available)

[✓] Network resources

• No issues found!

继续阅读Flutter调试 iOS 真机卡在启动页面，报错 “try setting IDEPreferLogStreaming=YES”

make: *** No rule to make target `sqlite_cfg.h', needed by `.target_source'

前置条件

macOS Sonoma (14.4.1)
MacBook Pro 2023-Apple M2 Pro （4能效核、8性能核、32GB内存、2TB磁盘）
Homebrew (4.2.18 或更高版本)
Xcode Version 15.3 (15E204a)
DevEco Studio NEXT Developer Preview2 4.1.3.700

错误信息

源代码编译 sqlite3 ：

# https://github.com/clemensg/sqlite3pod
$ wget https://www.sqlite.org/2024/sqlite-src-3450100.zip

$ unzip sqlite-src-3450100.zip

$ cd sqlite-src-3450100

$ ./configure

$ make

# https://github.com/clemensg/sqlite3pod

$ wget https://www.sqlite.org/2024/sqlite-src-3450100.zip

$ unzip sqlite-src-3450100.zip

$ cd sqlite-src-3450100

$ ./configure

$ make

或者使用 pod 安装 sqlite3 报错：

$ pod try sqlite3
Updating spec repositories

Trying sqlite3
[!] /opt/homebrew/bin/bash -c 
set -e
cd sqlite-src-3450100
./configure
make sqlite3.c sqlite3.h sqlite3ext.h

checking build system type... arm-apple-darwin23.4.0
checking host system type... arm-apple-darwin23.4.0
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for a sed that does not truncate output... /opt/homebrew/bin/gsed
checking for grep that handles long lines and -e... /opt/homebrew/bin/ggrep
checking for egrep... /opt/homebrew/bin/ggrep -E
checking for fgrep... /opt/homebrew/bin/ggrep -F
checking for ld used by gcc... /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld
checking if the linker (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld) is GNU ld... no
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B
checking the name lister (/usr/bin/nm -B) interface... BSD nm
checking whether ln -s works... yes
checking the maximum length of command line arguments... 786432
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... yes
checking for /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld option to reload object files... -r
checking for objdump... objdump
checking how to recognize dependent libraries... pass_all
checking for ar... ar
checking for strip... strip
checking for ranlib... ranlib
checking command to parse /usr/bin/nm -B output from gcc object... ok
checking for dsymutil... dsymutil
checking for nmedit... nmedit
checking for lipo... lipo
checking for otool... otool
checking for otool64... no
checking for -single_module linker flag... no
checking for -exported_symbols_list linker flag... yes
checking how to run the C preprocessor... gcc -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for dlfcn.h... yes
checking for objdir... .libs
checking if gcc supports -fno-rtti -fno-exceptions... yes
checking for gcc option to produce PIC... -fno-common -DPIC
checking if gcc PIC flag -fno-common -DPIC works... yes
checking if gcc static flag -static works... no
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.o... (cached) yes
checking whether the gcc linker (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld) supports shared libraries... yes
checking dynamic linker characteristics... darwin23.4.0 dyld
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking for a BSD-compatible install... /opt/homebrew/bin/ginstall -c
checking for special C compiler options needed for large files... no
checking for _FILE_OFFSET_BITS value needed for large files... no
checking for int8_t... yes
checking for int16_t... yes
checking for int32_t... yes
checking for int64_t... yes
checking for intptr_t... yes
checking for uint8_t... yes
checking for uint16_t... yes
checking for uint32_t... yes
checking for uint64_t... yes
checking for uintptr_t... yes
checking for sys/types.h... (cached) yes
checking for stdlib.h... (cached) yes
checking for stdint.h... (cached) yes
checking for inttypes.h... (cached) yes
checking malloc.h usability... no
checking malloc.h presence... no
checking for malloc.h... no
checking for fdatasync... yes
checking for gmtime_r... yes
checking for isnan... yes
checking for localtime_r... yes
checking for localtime_s... no
checking for malloc_usable_size... no
checking for strchrnul... no
checking for usleep... yes
checking for utime... yes
checking for pread... yes
checking for pread64... no
checking for pwrite... yes
checking for pwrite64... no
checking for tclsh8.7... no
checking for tclsh8.6... tclsh8.6
configure: Version set to 3.45
configure: Release set to 3.45.1
checking for WASI SDK directory... no
checking whether to support threadsafe operation... yes
checking for library containing pthread_create... none required
checking for library containing pthread_mutexattr_init... none required
checking whether to support shared library linked as release mode or not... no
checking whether to use an in-ram database for temporary tables... no
checking if executables have the .exe suffix... unknown
checking for Tcl configuration... found /opt/homebrew/Cellar/tcl-tk/8.6.14/lib/tclConfig.sh
checking for existence of /opt/homebrew/Cellar/tcl-tk/8.6.14/lib/tclConfig.sh... loading
checking for library containing readline... -ledit
not using linenoise
checking for library containing fdatasync... none required
checking build type... release
checking zlib.h usability... yes
checking zlib.h presence... yes
checking for zlib.h... yes
checking for library containing deflate... -lz
checking for library containing dlopen... none required
checking whether to support math functions... yes
checking for library containing ceil... none required
checking whether to support JSON functions... yes
checking whether to support MEMSYS5... no
checking whether to support MEMSYS3... no
checking whether to support FTS3... no
checking whether to support FTS4... no
checking whether to support FTS5... no
checking whether to support LIMIT on UPDATE and DELETE statements... no
checking whether to support GEOPOLY... no
checking whether to support RTREE... no
checking whether to support SESSION... no
configure: creating ./config.status
config.status: creating Makefile
config.status: creating sqlite3.pc
config.status: creating sqlite_cfg.h
config.status: sqlite_cfg.h is unchanged
config.status: executing libtool commands
gcc  -g -O2 -o mkkeywordhash -DSQLITE_ENABLE_MATH_FUNCTIONS  /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/mkkeywordhash.c
./mkkeywordhash >keywordhash.h
gcc  -g -O2 -o lemon /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/lemon.c
cp /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/lempar.c .
cp /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/src/parse.y .
./lemon -DSQLITE_ENABLE_MATH_FUNCTIONS  -S parse.y
sh /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/cktclsh.sh 8.4 tclsh8.6
touch has_tclsh84
cat parse.h /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/src/vdbe.c | tclsh8.6 /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/mkopcodeh.tcl >opcodes.h
tclsh8.6 /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/mkopcodec.tcl opcodes.h >opcodes.c
make: *** No rule to make target `sqlite_cfg.h', needed by `.target_source'.  Stop.

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$ pod try sqlite3

Updating spec repositories

Trying sqlite3

[!] /opt/homebrew/bin/bash -c

set -e

cd sqlite-src-3450100

./configure

make sqlite3.c sqlite3.h sqlite3ext.h

checking build system type... arm-apple-darwin23.4.0

checking host system type... arm-apple-darwin23.4.0

checking for gcc... gcc

checking whether the C compiler works... yes

checking for C compiler default output file name... a.out

checking for suffix of executables...

checking whether we are cross compiling... no

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether gcc accepts -g... yes

checking for gcc option to accept ISO C89... none needed

checking for a sed that does not truncate output... /opt/homebrew/bin/gsed

checking for grep that handles long lines and -e... /opt/homebrew/bin/ggrep

checking for egrep... /opt/homebrew/bin/ggrep -E

checking for fgrep... /opt/homebrew/bin/ggrep -F

checking for ld used by gcc... /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld

checking if the linker (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld) is GNU ld... no

checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B

checking the name lister (/usr/bin/nm -B) interface... BSD nm

checking whether ln -s works... yes

checking the maximum length of command line arguments... 786432

checking whether the shell understands some XSI constructs... yes

checking whether the shell understands "+="... yes

checking for /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld option to reload object files... -r

checking for objdump... objdump

checking how to recognize dependent libraries... pass_all

checking for ar... ar

checking for strip... strip

checking for ranlib... ranlib

checking command to parse /usr/bin/nm -B output from gcc object... ok

checking for dsymutil... dsymutil

checking for nmedit... nmedit

checking for lipo... lipo

checking for otool... otool

checking for otool64... no

checking for -single_module linker flag... no

checking for -exported_symbols_list linker flag... yes

checking how to run the C preprocessor... gcc -E

checking for ANSI C header files... yes

checking for sys/types.h... yes

checking for sys/stat.h... yes

checking for stdlib.h... yes

checking for string.h... yes

checking for memory.h... yes

checking for strings.h... yes

checking for inttypes.h... yes

checking for stdint.h... yes

checking for unistd.h... yes

checking for dlfcn.h... yes

checking for objdir... .libs

checking if gcc supports -fno-rtti -fno-exceptions... yes

checking for gcc option to produce PIC... -fno-common -DPIC

checking if gcc PIC flag -fno-common -DPIC works... yes

checking if gcc static flag -static works... no

checking if gcc supports -c -o file.o... yes

checking if gcc supports -c -o file.o... (cached) yes

checking whether the gcc linker (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld) supports shared libraries... yes

checking dynamic linker characteristics... darwin23.4.0 dyld

checking how to hardcode library paths into programs... immediate

checking whether stripping libraries is possible... yes

checking if libtool supports shared libraries... yes

checking whether to build shared libraries... yes

checking whether to build static libraries... yes

checking for a BSD-compatible install... /opt/homebrew/bin/ginstall -c

checking for special C compiler options needed for large files... no

checking for _FILE_OFFSET_BITS value needed for large files... no

checking for int8_t... yes

checking for int16_t... yes

checking for int32_t... yes

checking for int64_t... yes

checking for intptr_t... yes

checking for uint8_t... yes

checking for uint16_t... yes

checking for uint32_t... yes

checking for uint64_t... yes

checking for uintptr_t... yes

checking for sys/types.h... (cached) yes

checking for stdlib.h... (cached) yes

checking for stdint.h... (cached) yes

checking for inttypes.h... (cached) yes

checking malloc.h usability... no

checking malloc.h presence... no

checking for malloc.h... no

checking for fdatasync... yes

checking for gmtime_r... yes

checking for isnan... yes

checking for localtime_r... yes

checking for localtime_s... no

checking for malloc_usable_size... no

checking for strchrnul... no

checking for usleep... yes

checking for utime... yes

checking for pread... yes

checking for pread64... no

checking for pwrite... yes

checking for pwrite64... no

checking for tclsh8.7... no

checking for tclsh8.6... tclsh8.6

configure: Version set to 3.45

configure: Release set to 3.45.1

checking for WASI SDK directory... no

checking whether to support threadsafe operation... yes

checking for library containing pthread_create... none required

checking for library containing pthread_mutexattr_init... none required

checking whether to support shared library linked as release mode or not... no

checking whether to use an in-ram database for temporary tables... no

checking if executables have the .exe suffix... unknown

checking for Tcl configuration... found /opt/homebrew/Cellar/tcl-tk/8.6.14/lib/tclConfig.sh

checking for existence of /opt/homebrew/Cellar/tcl-tk/8.6.14/lib/tclConfig.sh... loading

checking for library containing readline... -ledit

not using linenoise

checking for library containing fdatasync... none required

checking build type... release

checking zlib.h usability... yes

checking zlib.h presence... yes

checking for zlib.h... yes

checking for library containing deflate... -lz

checking for library containing dlopen... none required

checking whether to support math functions... yes

checking for library containing ceil... none required

checking whether to support JSON functions... yes

checking whether to support MEMSYS5... no

checking whether to support MEMSYS3... no

checking whether to support FTS3... no

checking whether to support FTS4... no

checking whether to support FTS5... no

checking whether to support LIMIT on UPDATE and DELETE statements... no

checking whether to support GEOPOLY... no

checking whether to support RTREE... no

checking whether to support SESSION... no

configure: creating ./config.status

config.status: creating Makefile

config.status: creating sqlite3.pc

config.status: creating sqlite_cfg.h

config.status: sqlite_cfg.h is unchanged

config.status: executing libtool commands

gcc -g -O2 -o mkkeywordhash -DSQLITE_ENABLE_MATH_FUNCTIONS /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/mkkeywordhash.c

./mkkeywordhash >keywordhash.h

gcc -g -O2 -o lemon /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/lemon.c

cp /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/lempar.c .

cp /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/src/parse.y .

./lemon -DSQLITE_ENABLE_MATH_FUNCTIONS -S parse.y

sh /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/cktclsh.sh 8.4 tclsh8.6

touch has_tclsh84

cat parse.h /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/src/vdbe.c | tclsh8.6 /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/mkopcodeh.tcl >opcodes.h

tclsh8.6 /private/var/folders/z8/_cvsdvbd4x51vm4szw5xkw0w0000gn/T/CocoaPods/Try/sqlite3/sqlite-src-3450100/tool/mkopcodec.tcl opcodes.h >opcodes.c

make: *** No rule to make target `sqlite_cfg.h', needed by `.target_source'. Stop.

观察源代码目录，也确实没有 sqlite_cfg.h 文件生成。

继续阅读make: *** No rule to make target `sqlite_cfg.h', needed by `.target_source'

Flutter: Xcode error “Unable to boot the Simulator“

使用 flutter、Android Studio ，通过iOS模拟器运行项目，一直一切正常。

某次重启后无法启动模拟器，报错信息如下：

 "Unable to boot the simulator".

1	"Unable to boot the simulator".

解决方法，亲测有效：

macOS 14.4.1以及更高版本：
进入 “系统设置”→“通用”→“存储空间”→“开发者” 删除 “XCode 缓存” 。

在 macOS 13 及更高版本上：
进入 “系统设置”→“常规”→“存储”→“开发人员”
删除“开发者缓存”

在 macOS 12 及更低版本上：
转到“关于本机”→“存储”→“管理”→“开发人员”

参考链接

Flutter: XCode error “Unable to boot the Simulator

为容器添加基于BoxDecoration的labelText (作为TextField)

TextField 有一个很好的方法来在它的 BoxDecoration 装饰上放置一个文本标签，如下：

通过以下方式：

TextField(
        onTap: onTap,
        controller: controller,
        decoration: InputDecoration(
          labelText: "XP",
          border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(50.0),
          ),
        ));

TextField(

onTap: onTap,

controller: controller,

decoration: InputDecoration(

labelText: "XP",

border: OutlineInputBorder(

borderRadius: BorderRadius.circular(50.0),

));

有没有办法在 Container 的其他 BoxDecoration 上实现同样的效果？例如，我想指定标签"XP"：

        Container(
          decoration: BoxDecoration(
            borderRadius: BorderRadius.all(Radius.circular(5)),
            border: Border.all(color: color, width: 2.0),
            labelText: Text("XP"),   // No such attribute
          ),
          child: child,
        ),

Container(

decoration: BoxDecoration(

borderRadius: BorderRadius.all(Radius.circular(5)),

border: Border.all(color: color, width: 2.0),

labelText: Text("XP"), // No such attribute

child: child,

但是 Flutter 没有为 BoxDecoration 提供 labelText (仅存在于 InputDecoration )。

我们可以使用 InputDecorator 作为父对象来完成上述需求，如下：

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const Home(),
      debugShowCheckedModeBanner: false,
    );
  }
}

class Home extends StatefulWidget {
  const Home({super.key});

  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Container(
          height: 100,
          width: 400,
          child: InputDecorator(
            decoration: InputDecoration(
                labelText: 'XP',
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(10),
                )),
            child: Text("Container Content"),
          ),
        ),
      ),
    );
  }
}

import 'package:flutter/material.dart';

void main() {

runApp(const MyApp());

}

class MyApp extends StatelessWidget {

const MyApp({super.key});

// This widget is the root of your application.

@override

Widget build(BuildContext context) {

return MaterialApp(

title: 'Flutter Demo',

theme: ThemeData(

primarySwatch: Colors.blue,

home: const Home(),

debugShowCheckedModeBanner: false,

);

}

class Home extends StatefulWidget {

const Home({super.key});

@override

State<Home> createState() => _HomeState();

}

class _HomeState extends State<Home> {

@override

Widget build(BuildContext context) {

return Scaffold(

body: Center(

child: Container(

height: 100,

width: 400,

child: InputDecorator(

decoration: InputDecoration(

labelText: 'XP',

border: OutlineInputBorder(

borderRadius: BorderRadius.circular(10),

)),

child: Text("Container Content"),

);

}

输出

参考链接

Flutter TextField/TextFormField垂直方向完整填充父容器高度（或者全屏显示）

正常情况下，我们使用 TextField/TextFormField 的时候，都是单行的表单或者指定行数的情况。但是有时候，我们希望能自适应父容器的高度，或者高度动态自适应变化。

那么我们应该怎么操作呢？

继续阅读Flutter TextField/TextFormField垂直方向完整填充父容器高度（或者全屏显示）

Flutter中AspectRatio、Card 卡片组件

1. AspectRatio 组件

AspectRatio 的作用是根据设置调整子元素 child 的宽高比。

AspectRatio 首先会在布局限制条件允许的范围内尽可能的扩展，widget 的高度是由宽度和比率决定的，类似于 BoxFit 中的 contain，按照固定比率去尽量占满区域。

如果在满足所有限制条件过后无法找到一个可行的尺寸，AspectRatio 最终将会去优先适应布局限制条件，而忽略所设置的比率。

常见属性：

1. aspectRatio 宽高比。页面最终也许不会按这个值去布局，具体则要看综合因素，这只是一个参考值；

2. child 子组件。值的类型为Widget；

代码示例：

import 'package:flutter/material.dart';

void main(){
    runApp(MyApp());
}

// 抽离成一个单独的组件
class MyApp extends StatelessWidget{
    @override
    Widget build(BuildContext context) {
        return MaterialApp(
            home: Scaffold(
                // 导航条
                appBar:AppBar(title:Text('Flutter App')),
                // 主体
                body:HomeContent(),
            ),
            // 主题
            theme: ThemeData(primarySwatch:Colors.yellow),
        );
    }
}

// AspectRatio组件的用法
class HomeContent extends StatelessWidget{
    @override
    Widget build(BuildContext context) {
        return AspectRatio(
            // 高度与宽度的比值
            aspectRatio: 5.0/1.0 ,
            child:Container(
                color:Colors.red
            )
        );
    }
}

import 'package:flutter/material.dart';

void main(){

runApp(MyApp());

}

// 抽离成一个单独的组件

class MyApp extends StatelessWidget{

@override

Widget build(BuildContext context) {

return MaterialApp(

home: Scaffold(

// 导航条

appBar:AppBar(title:Text('Flutter App')),

// 主体

body:HomeContent(),

// 主题

theme: ThemeData(primarySwatch:Colors.yellow),

);

}

// AspectRatio组件的用法

class HomeContent extends StatelessWidget{

@override

Widget build(BuildContext context) {

return AspectRatio(

// 高度与宽度的比值

aspectRatio: 5.0/1.0 ,

child:Container(

color:Colors.red

)

);

}

继续阅读Flutter中AspectRatio、Card 卡片组件

Flutter-Container详解

概述

Container是一个拥有绘制、定位、调整大小的 widget，是开发中最常用、最基础的组件。虽然最基础但不可小觑，熟悉每一个属性可以帮助我们更好更快的实现想要的效果，避免走弯路，也能避免代码冗余。本文主要针对其属性进行讲解。

属性

  Container({
    Key? key,
    this.alignment,
    this.padding,
    this.color,
    this.decoration,
    this.foregroundDecoration,
    double? width,
    double? height,
    BoxConstraints? constraints,
    this.margin,
    this.transform,
    this.transformAlignment,
    this.child,
    this.clipBehavior = Clip.none,
  })

Container({

Key? key,

this.alignment,

this.padding,

this.color,

this.decoration,

this.foregroundDecoration,

double? width,

double? height,

BoxConstraints? constraints,

this.margin,

this.transform,

this.transformAlignment,

this.child,

this.clipBehavior = Clip.none,

})

key

key用于控制控件如何取代树中的另一个控件，即若widget指定了相同的key，则这些widget可以复用。如果widget的key值不为空，会判断key._currentElement值所指向的widget，和当前widget的类型key都相同，那么就从旧的父节点上移除，作为当前的节点的子widget之一，否则将进行真实的创建新的Element。若开发中对组建的复用没有较高要求，一般不设置该属性。

继续阅读Flutter-Container详解

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