問(wèn)題一：圖片導(dǎo)入配置后編譯時(shí)報(bào)錯(cuò)
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
這種問(wèn)題是由于 pubspec.yaml 文件配置不對(duì)導(dǎo)致的螺戳。
錯(cuò)誤配置：flutter 下 assets: 與 uses-material-design: true層級(jí)結(jié)構(gòu)未對(duì)齊
# 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/
正確配置：flutter 下 assets: 與 uses-material-design: true層級(jí)結(jié)構(gòu)對(duì)齊
# 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 文件配置后醋旦，需要 cd 進(jìn)入 flutter目錄下 執(zhí)行終端命令flutter pub get,使配置生效。
bogon:learn_flutter zhanghua$ flutter pub get
Running "flutter pub get" in learn_flutter... 1,691ms
問(wèn)題二：圖片導(dǎo)入后圖片資源無(wú)法加載咒劲、查找不到問(wèn)題
The following assertion was thrown resolving an image codec:
Unable to load asset: assets/images/3.0x/wenhao@3x.png
這種問(wèn)題也是由于 pubspec.yaml 文件圖片路徑配置不對(duì)導(dǎo)致的顷蟆。
配置如圖：
調(diào)用：
Widget build(BuildContext context) {
//圖片路徑
final imageLoc = "assets/images/3.0x/wenhao@3x.png";
return Image(
image:AssetImage(imageLoc),
);
}
如果圖片還是加載不出來(lái)的話 , cd 進(jìn)入 flutter目錄下 執(zhí)行終端命令flutter pub get，重新運(yùn)行腐魂。
問(wèn)題三：No such module 'Flutter'
在 flutter 新項(xiàng)目做 Swift 混編的時(shí)候 帐偎，打開(kāi)Xcode編譯報(bào)錯(cuò) 如下圖：
如果是在運(yùn)行模擬器時(shí)出現(xiàn) Module '… ’ not found或者 No such module 'Flutter'柬讨。您可以事先打開(kāi)您的模擬器奄抽，在Android studio中選擇iphone模擬器先運(yùn)行一次蛔琅，再在Xcode里面運(yùn)行台谍，可以正常跑通
問(wèn)題四： 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.
解決：
flutter clean
還是出錯(cuò)的話可運(yùn)行：
flutter pub cache repair
最后：flutter clean
問(wèn)題五：Xcode installation is incomplete; a full installation is necessary for iOS development
執(zhí)行命令：
flutter doctor
報(bào)如下錯(cuò)誤：
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)
解決辦法：
終端中執(zhí)行下面兩行命令
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo gem install cocoapods
再然后執(zhí)行
//1.清除
flutter clean
//2.加載插件
flutter pub get
文章持續(xù)更新中嘁扼、希望對(duì)各位有所幫助树灶、有問(wèn)題可留言 大家共同學(xué)習(xí).
