+ (UIImage*)scaleImage:(UIImage*)img toSize:(CGSize)size{ int h = img.size.height; int w = img.size.width; if(h <= size.height && w <= size.width) { return img; } else { float destWith = 0.0f; float destHeight = 0.0f; float suoFang = (float)w/h; float suo = (float)h/w; if (w>h) { destWith = (float)size.width; destHeight = size.width * suo; }else { destHeight = (float)size.height; destWith = size.height * suoFang; } CGSize itemSize = CGSizeMake(destWith, destHeight); UIGraphicsBeginImageContext(itemSize); CGRect imageRect = CGRectMake(0, 0, destWith, destHeight); [img drawInRect:imageRect]; UIImage *newImg = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return newImg; } }
UIImage等比缩放图像,按最大尺寸缩放,这才叫真正的缩放
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转载自re-reference.iteye.com/blog/1615287
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