在flutter的工程中引入第三方插件后选择模拟器运行(我是在安卓模拟器可以运行，但是iOS模拟器报错)时报错，错误信息如下：

Xcode's output:
↳
    warning: The iOS Simulator deployment target is set to 7.0, but the range of supported deployment target versions for this platform is 8.0 to 12.2.99. (in target 'Flutter')
    /Users/flutter/.pub-cache/hosted/pub.flutter-io.cn/flutter_des-1.1.0/ios/Classes/FlutterDesPlugin.m:2:9: fatal error: 'flutter_des/flutter_des-Swift.h' file not found
    #import <flutter_des/flutter_des-Swift.h>
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    1 error generated.
    note: Using new build systemnote: Planning buildnote: Constructing build description

这里说是找不到头文件，使用xcode打开Flutter工程目录下ios目录中的Runner.xcworkspace文件，然后选择pods下的podfile文件，在其头部添加

use_frameworks!

然后执行 pod install 即可。