An animation block that calls the subviews updateConstraints method
2015-06-03 17:45
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原文链接：http://www.cnblogs.com/newBlash/p/4549816.html
[self.view layoutIfNeeded];
[self.subView setNeedsUpdateConstraints];
[self.subView updateConstraintsIfNeeded];
[UIView animateWithDuration:1.0f delay:0.0f options:UIViewAnimationOptionLayoutSubviews animations:^{
[self.view layoutIfNeeded];
} completion:nil];
转载于:https://www.cnblogs.com/newBlash/p/4549816.html
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