错误一：In file includedfromViewController.m:9:**./ViewController.h:9:9: ****fatal error: ****'UIKit/UIKit.h'filenotfound**#import <UIKit/UIKit.h>** ^**1error generated.
1、进入终端，键入命令vim ~/.bash_profile
2、在vim界面输入i进入编辑编辑状态并且键入：alias rewriteoc='clang -x objective-c -rewrite-objc -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk'
3、键入完毕，点esc退出编辑状态，再键入:wq退出vim并保存，执行source ~/.bash_profile<-这句一定要执行，执行才会生效
错误二： 'UIWebView' is unavailable: not available on macOS
解决办法：
指定真机
xcrun -sdk iphoneos clang -rewrite-objc ViewController.m
指定模拟器
xcrun -sdk iphonesimulator clang -rewrite-objc ViewController.m
指定SDK版本
xcrun -sdk iphonesimulator10.3 clang -rewrite-objc ViewController.m
Ç语言转C ++
zhangquaniMac:~ zq$ cd /Users/zq/Desktop/Test/Test
zhangquaniMac:Test zq$ clang -rewrite-objc main.c
参考：
HTTPS：//cotin.tech/iOS/clang-rewrite-objc/
https://blog.csdn.net/qq_34003239/article/details/84230019
https://www.jianshu.com/p/43a09727eb2c
