问题一：图片导入配置后编译时报错
Error detected in pubspec.yaml:
Error on line 48, column 4: Expected a key while parsing a block mapping.
╷
48 │ assets:
│ ^
╵
Please correct the pubspec.yaml file at /Users/zhanghua/Desktop/learn_flutter/pubspec.yaml
这种问题是由于 pubspec.yaml 文件配置不对导致的。
错误配置：flutter 下 assets: 与 uses-material-design: true层级结构未对齐
# The following section is specific to Flutter.
flutter:
# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
# the material Icons class.
uses-material-design: true
# To add assets to your application, add an assets section, like this:
assets:
- assets/images/
- assets/images/2.0x/
- assets/images/3.0x/
正确配置：flutter 下 assets: 与 uses-material-design: true层级结构对齐
# The following section is specific to Flutter.
flutter:
# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
# the material Icons class.
uses-material-design: true
# To add assets to your application, add an assets section, like this:
assets:
- assets/images/
- assets/images/2.0x/
- assets/images/3.0x/
最后修改 pubspec.yaml 文件配置后，需要 cd 进入 flutter目录下 执行终端命令flutter pub get,使配置生效。
bogon:learn_flutter zhanghua$ flutter pub get
Running "flutter pub get" in learn_flutter... 1,691ms
问题二：图片导入后图片资源无法加载、查找不到问题
The following assertion was thrown resolving an image codec:
Unable to load asset: assets/images/3.0x/wenhao@3x.png
这种问题也是由于 pubspec.yaml 文件图片路径配置不对导致的。
配置如图：
截屏2022-03-14 下午8.23.21.png
调用：
Widget build(BuildContext context) {
//图片路径
final imageLoc = "assets/images/3.0x/wenhao@3x.png";
return Image(
image:AssetImage(imageLoc),
);
}
如果图片还是加载不出来的话 , cd 进入 flutter目录下 执行终端命令flutter pub get，重新运行。
问题三：No such module 'Flutter'
在 flutter 新项目做 Swift 混编的时候 ，打开Xcode编译报错 如下图：
截屏2022-03-23 下午4.36.55.png
如果是在运行模拟器时出现 Module '… ’ not found或者 No such module 'Flutter'。您可以事先打开您的模拟器，在Android studio中选择iphone模拟器先运行一次，再在Xcode里面运行，可以正常跑通
问题四： Error output from Xcode build:
Launching lib/main.dart on iPhone 12 Pro Max in debug mode...
Running Xcode build...
Xcode build done. 8.6s
Failed to build iOS app
Error output from Xcode build:
↳
** BUILD FAILED **
**************省略部分********************
Command PhaseScriptExecution failed with a nonzero exit code
note: Using new build system
note: Planning build
note: Constructing build description
Could not build the application for the simulator.
Error launching application on iPhone 11 Pro Max.
解决：
flutter clean
还是出错的话可运行：
flutter pub cache repair
最后：flutter clean
问题五：Xcode installation is incomplete; a full installation is necessary for iOS development
执行命令：
flutter doctor
报如下错误：
zhanghua@Breeze chinads_flutter_module % flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, 2.13.0-0.0.pre.575, on macOS 12.1 21C52 darwin-x64, locale zh-Hans-CN)
[!] Xcode - develop for iOS and macOS
✗ Xcode installation is incomplete; a full installation is necessary for iOS development.
Download at: https://developer.apple.com/xcode/download/
Or install Xcode via the App Store.
Once installed, run:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo xcodebuild -runFirstLaunch
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.1)
[✓] VS Code (version 1.66.2)
[✓] Connected device (1 available)
解决办法：
终端中执行下面两行命令
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo gem install cocoapods
再然后执行
//1.清除
flutter clean
//2.加载插件
flutter pub get
文章持续更新中、希望对各位有所帮助、有问题可留言 大家共同学习.
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