iOS下的Masonry适配

// 左侧

@property
(nonatomic,strong,readonly)
MASConstraint *left;

// 顶部

@property
(nonatomic,strong,readonly)
MASConstraint *top;

// 右侧

@property
(nonatomic,strong,readonly)
MASConstraint *right;

// 底部

@property
(nonatomic,strong,readonly)
MASConstraint *bottom;

// 首部

@property
(nonatomic,strong,readonly)
MASConstraint *leading;

// 尾部

@property
(nonatomic,strong,readonly)
MASConstraint *trailing;

// 宽

@property
(nonatomic,strong,readonly)
MASConstraint *width;

// 高

@property
(nonatomic,strong,readonly)
MASConstraint *height;

// 中心点x

@property
(nonatomic,strong,readonly)
MASConstraint *centerX;

// 中心点y

@property
(nonatomic,strong,readonly)
MASConstraint *centerY;

// 文本基线

@property
(nonatomic,strong,readonly)
MASConstraint *baseline;

//设置约束
- (NSArray *)mas_makeConstraints:(void(^)(MASConstraintMaker *))block;
//如果之前已经有约束,则更新新的约束,如果没有约束,则添加约束
- (NSArray *)mas_updateConstraints:(void(^)(MASConstraintMaker *))block;
//将之前的约束全部删除,添加新的约束

- (NSArray *)mas_remakeConstraints:(void(^)(MASConstraintMaker *make))block;