flutter run
Launching lib/main.dart on iPhone 12 Pro Max in debug mode...

Running Xcode build...
Xcode build done.                                           18.8s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **

                                                  andler:
    In module 'UIKit' imported from
    /Users/Singer/work/iOSProject/Access/ios/Pods/Target Support
    Files/launch_review/launch_review-prefix.pch:2:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
    m/Developer/SDKs/iPhoneSimulator14.5.sdk/System/Library/Frameworks/UIKit.fra
    mework/Headers/UIApplication.h:123:1: note: 'openURL:' has been explicitly
    marked deprecated here
    - (BOOL)openURL:(NSURL*)url
    API_DEPRECATED_WITH_REPLACEMENT("openURL:options:completionHandler:",
    ios(2.0, 10.0)) NS_EXTENSION_UNAVAILABLE_IOS("");
    ^
........
Xcode's output:
Command PhaseScriptExecution failed with a nonzero exit code
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Analyzing workspace
    note: Constructing build description
    note: Build preparation complete

Could not build the application for the simulator.
Error launching application on iPhone 12 Pro Max.

模拟器调试始终报错，真机调试就正常。

这让我感觉可能是指令集的问题

看了下输出的日志并没有明显的错误，都是一些警告，无关痛痒
看了下build目录已经生成了Runner.app
用命令查看了一下下面几个文件的指令集

lipo -info ios/Flutter/App.framework/App          //x86_64 arm64

lipo -info ios/Flutter/Flutter.framework/Flutter        ///x86_64 armv7 arm64

lipo -info build/ios/iphonesimulator/Runner.app/Runner          //arm64

Runner是arm64指令集的，我的MacBookPro是Intel的也就x86_64的指令集 模拟器也就是x86_64，arm64的Runner.app无法安装到x86_64上面去

这让我想起了前几天配置的一个环境变量

查看环境变量

export -p

在里面发现一行

export FLUTTER_BUILD_MODE=release

通过下面的命令把FLUTTER_BUILD_MODE删除

unset FLUTTER_BUILD_MODE

重新执行

flutter run

OK 搞定 成功在iOS模拟器运行起来