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[self.view layoutIfNeeded]; [self.subView setNeedsUpdateConstraints]; [self.subView updateConstraintsIfNeeded]; [UIView animateWithDuration:1.0f delay:0.0f options:UIViewAnimationOptionLayoutSubviews animations:^{ [self.view layoutIfNeeded]; } completion:nil];
An animation block that calls the subviews updateConstraints method
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原文地址：http://www.cnblogs.com/newBlash/p/4549816.html
