Masonry使用

1 //设置约束2 - (NSArray *)mas_makeConstraints:(void(^)(MASConstraintMaker *))block;3 4 //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5 - (NSArray *)mas_updateConstraints:(void(^)(MASConstraintMaker *))block;6 7 //将之前的约束全部删除,添加新的约束8 - (NSArray *)mas_remakeConstraints:(void(^)(MASConstraintMaker *make))block;

以下为代码使用实现布局效果：
 1     //添加两个控件 2     UIView *blueView = [[UIView alloc] init]; 3     blueView.backgroundColor = [UIColor blueColor]; 4     blueView.translatesAutoresizingMaskIntoConstraints = NO; 5     [self.view addSubview:blueView]; 6      7     UIView *redView = [[UIView alloc] init]; 8     redView.backgroundColor = [UIColor redColor]; 9     redView.translatesAutoresizingMaskIntoConstraints = NO;10     [self.view addSubview:redView];11 12     //给蓝色View设置约束13     [blueView mas_makeConstraints:^(MASConstraintMaker *make) {14         make.left.equalTo(self.view.mas_left).offset(30);//和父view的左边间距为30;15         make.bottom.equalTo(self.view.mas_bottom).offset(-30);//和父view的底部间距为30;16         make.right.equalTo(redView.mas_left).offset(-30);//和红色view的间距为30;17         make.height.mas_equalTo(50);//蓝色view的高度为5018     }];19     20     //给红色View设置约束21     [redView mas_makeConstraints:^(MASConstraintMaker *make) {22         make.right.equalTo(self.view.mas_right).offset(-30);//和父view的右边间距为30;23         make.bottom.equalTo(blueView.mas_bottom);//和蓝色view的底部对齐24         make.height.equalTo(blueView.mas_height);//和蓝色view的高度相等25         make.width.equalTo(blueView.mas_width);//和蓝色view的宽度相等26     }];

效果图如下：