参数1. 动画时长 参数2. 要改变属性 3.
[UIView animateWithDuration:2 animations:^{
self.changeView.backgroundColor = [UIColor greenColor];
} completion:^(BOOL finished) {
参数1. 动画时长 参数2. 要改变属性 3.
[UIView animateWithDuration:2 animations:^{
self.changeView.backgroundColor = [UIColor greenColor];
} completion:^(BOOL finished) {
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