self.OneImage.clipsToBounds = YES;
[self.OneImage setContentScaleFactor:[[UIScreen mainScreen] scale]];
self.OneImage.contentMode = UIViewContentModeScaleAspectFill;
self.OneImage.autoresizingMask = UIViewAutoresizingFlexibleHeight;
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iOS 截取图片,并且保持图片原有比例,同时填充imageView
原文：http://blog.csdn.net/liufp/article/details/47780131
