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出现这个警告的原因是presentViewController的receiver是一个detached view controller。比方说:window有一个root view controller,然后我们把某个view controller(VC1)的view添加到了root view controller的subview上面,然后在VC1上面presentViewController。这时我们需要将VC1添加到root view controller的childController里面去。
Presenting view controllers on detached view controllers is discouraged
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原文地址:http://www.cnblogs.com/wkdwangjun/p/5784165.html