Masonry基础使用

//设置某个View的宽高比

[thumbImageView mas_makeConstraints:^(MASConstraintMaker *make) {
    make.top.equalTo(@0);
    make.left.equalTo(@0);
    make.width.equalTo(self);
    make.height.equalTo(thumbImageView.mas_width).multipliedBy(0.8);
}];