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[UIView animateWithDuration:0.3 animations:^{
imageView.transform = CGAffineTransformMakeScale(2, 2);
} completion:^(BOOL finished) {
imageView.transform = CGAffineTransformMakeScale(1.0, 1.0);
}];
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原文地址：http://www.cnblogs.com/dzhs/p/5736213.html
