最近做iOS开发，老是遇到这种问题，正好我有两个版本的Xcode，换了另一个，就正常了，所以也一直没解决。
今天又遇到这个问题，就查了一下资料，找到了解决办法，在次记录一下方便查找，就是在Xcode中把项目clean一下，就正常了。
目录在Xcode的product------>clean.
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