CGImageRef temImg = image.CGImage;
float width = CGImageGetWidth(temImg);
float height = CGImageGetHeight(temImg);
temImg = CGImageCreateWithImageInRect(temImg, CGRectMake(width * 0.5 - height * 0.5, 0, height, height));
//得到新的图片
UIImage *new = [UIImage imageWithCGImage:temImg];
shopImage.image = new;
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