UIImage的擴展方法——裁剪圖片和等比列縮放圖片-翻轉-圓形等

@interface UIImage (extend) //按比例改變圖片大小 -(UIImage*)changeImageSizeWithOriginalImage:(UIImage*)image percent:(float)percent; //圓形 -(UIImage*)circleImage:(UIImage*)image; //截取部分圖像 -(UIImage*)getSubIma

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