Masonry的使用2

    //居中，尺寸是父控件的一半    [blueView mas_makeConstraints:^(MASConstraintMaker *make) {        make.size.mas_equalTo(self.view).multipliedBy(0.5);        make.center.mas_equalTo(self.view);    }];

 //内边距，距离父控件四周都是50的间距    CGFloat margin = 50;    [blueView mas_makeConstraints:^(MASConstraintMaker *make) {        make.edges.mas_equalTo(self.view).insets(UIEdgeInsetsMake(margin, margin, margin, margin));    }];