iOS Xcode 意外退出 打不开工程

The last time you opened Xcode, it unexpectedly quit while reopening windows. Do you want to try to reopen its windows again?

If you choose not to reopen windows, you may have to open and position the windows yourself.

Dont reopne    reopen  两个按钮  但是点哪个都打不开

解决方法:

/Users/(自己电脑名字)/Library/Developer/Xcode/DerivedData 

把这个文件夹里面的文件清理掉 这是Xcode的缓存文件 

退出Xcode 重新打开项目