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只需加这么一段代码，如下：
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.autoresizesSubviews = YES;
imageView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
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原文地址：http://www.cnblogs.com/jyking/p/5336472.html
