layout布局动画不生效问题
2018-05-21 本文已影响4人
iOSCoder_XH
动画不生效调用方式如下：
[UIView animateWithDuration:1 animations:^{
self.constraint.constant = height;
[self.view layoutIfNeeded];
}completion:^(BOOL finished) {
}];
修改方式如下：
[UIView animateWithDuration:1 animations:^{
self.constraint.constant = -height;
[self.view layoutIfNeeded];
}completion:^(BOOL finished) {
}];
