升级flutter(1.20.3+)，运行旧项目报错。

报错信息如下：

iOS Command PhaseScriptExecution failed with a nonzero exit code

xxxxx
xxxxx
xxxxx

The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 7.0, but the range ...

1.首先 解决了

The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 7.0, but the range ...

在项目 ios端目录里面找到 PodFile 文件
然后打开修改里面信息、如果没有post_install do |installer| 这条，请在最后添加这句
如下：

post_install do |installer|
    installer.pods_project.targets.each do |target|
        target.build_configurations.each do |config|
            config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '8.0'
        end
    end
end

补充 修改或者添加完毕 再检查一下 顶部
ios, '8.0' 需要跟上面设置的一致
'Runner' do 是你工程名字

# platform :ios, '8.0' 
# target 'Runner' do

最好再 重新执行 Pod install 命令

Pod install

2.解决 iOS Command PhaseScriptExecution failed with a nonzero exit code

首先 尝试

flutter clean

测试 是否解决

flutter run 

如果还是出错

flutter pub cache repair

/*
备注
当 flutter pub cache repair 过程报错时，
就退出终端，
执行flutter clean，
再次执行flutter pub cache repair
*/

最后

flutter clean