Error running pod install .Error launching application on iPhone 12 Pro Max.

• 首先检查 pod install 可不可以运行，我这里报错了

• 然后 运行 sudo gem install ffi 成功运行

• 继续 pod install 还是报错 ，先确认是否安装了 cocoapods，如果没有安装需要先安装，如果安装了， 在iOS 目录下
  的podfile文件中添加source源

    source 'https://cdn.cocoapods.org/'
    source 'https://github.com/aliyun/aliyun-specs.git'
    pod 'AlicloudPush', '~> 1.9.9'

• 然后执行 pod install 启动项目，出现了另外一个错误 如图
  

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

• 再修改下podfiel里面的 post_install

 post_install do |installer|
   installer.pods_project.targets.each do |target|
     target.build_configurations.each do |config|
         config.build_settings['ENABLE_BITCODE'] = 'NO'
         config.build_settings.delete 'IPHONEOS_DEPLOYMENT_TARGET'
         # config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '13.6'
         config.build_settings['SWIFT_VERSION'] = '4.1'
      end
   end
end

• 再启动～～～成功啦！！！