今天学到了masonry的一个新的小技巧
给view添加/移除单个约束
1、声明属性
@property (nonatomic, strong) MASConstraint *label1CentryX;
2.存储约束
[_label1 mas_updateConstraints:^(MASConstraintMaker *make) {
_label1CentryX = make.centerX.equalTo(self).priority(1000);
}];
3.添加约束
[_label1CentryX install];
4.移除约束
[_label1CentryX uninstall];