约束动画，关键代码 [self.view layoutIfNeeded];

只有加上 [self.view layoutIfNeeded];这一句才会有动画

 [UIView animateWithDuration:0.25 animations:^{
        [self.pinView mas_updateConstraints:^(MASConstraintMaker *make) {
            make.height.mas_equalTo(@(172 * kAppUIScaH));
        }];
        [self.view layoutIfNeeded];
    } completion:^(BOOL finished) {
    }];