iOS动画 Masonry约束弹框动画animateWithDuration:

 

[self.containtView mas_makeConstraints:^(MASConstraintMaker *make) {

        make.left.right.mas_equalTo(0);

        make.bottom.mas_equalTo(self.mas_bottom).offset(kContaintViewHeight);

        make.height.mas_equalTo(kContaintViewHeight)；

    }];

// 告知父控件 初始位置约束

   [self.containtView.superview layoutIfNeeded];

//告知需要更改约束

    [UIView animateWithDuration:0.3 animations:^{

        [self.containtView mas_updateConstraints:^(MASConstraintMaker *make) {

            make.bottom.mas_equalTo(0);

        }];

//告知父类控件绘制，不添加注释的这两行的代码无法生效

        [self.containtView.superview layoutIfNeeded];

    }];