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//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); }];
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原文地址：http://www.cnblogs.com/xiongzenghui/p/4686712.html
