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http://stackoverflow.com/questions/20087408/lag-between-viewwillappear-and-viewdidappear
两种解决方案 :
1.
dispatch_async(dispatch_get_main_queue(), ^{
[presentingViewController presentViewController:VC
animated:YES
completion:^{
}];
});
2.
[self performSelectorOnMainThread:@selector(methodName) withObject:nil waitUntilDone:NO];
// methodName方法只是一个空方法就行
iOS7 之后 presentviewcontroller 延迟的解决方案
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原文地址:http://www.cnblogs.com/houtou118/p/5056654.html