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1.先check下你的VC在添加的时候是否忘记勾选了target,检查方法如下
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如果这个蓝色的勾没打,记得打上
2.如果无效,将VC 和StoryBoard/xib 文件Remove Reference 后重新添加一次
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3.如果无效,删除掉Xcode的DerivedData ,重启xcode,DeriveData的路径:
~/Library/Developer/Xcode/DerivedData
4.如果使用的系统默认生成的ViewController ,不妨将这个ViewController 重命名试试看
顺便提下重命名的方法:
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