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copied!<p>This code will fix your problem:</p> <pre><code>+ (UIImage *)scaleImageProportionally:(UIImage *)image { if (MAX(image.size.height, image.size.width) <= DEFAULT_PHOTO_MAX_SIZE) { return image; } else { CGFloat targetWidth = 0; CGFloat targetHeight = 0; if (image.size.height > image.size.width) { CGFloat ratio = image.size.height / image.size.width; targetHeight = DEFAULT_PHOTO_MAX_SIZE; targetWidth = roundf(DEFAULT_PHOTO_MAX_SIZE/ ratio); } else { CGFloat ratio = image.size.width / image.size.height; targetWidth = DEFAULT_PHOTO_MAX_SIZE; targetHeight = roundf(DEFAULT_PHOTO_MAX_SIZE/ ratio); } CGSize targetSize = CGSizeMake(targetWidth, targetHeight); UIImage *sourceImage = image; UIImage *newImage = nil; CGSize imageSize = sourceImage.size; CGFloat width = imageSize.width; CGFloat height = imageSize.height; targetWidth = targetSize.width; targetHeight = targetSize.height; CGFloat scaleFactor = 0.0; CGFloat scaledWidth = targetWidth; CGFloat scaledHeight = targetHeight; CGPoint thumbnailPoint = CGPointMake(0.0, 0.0); if (!CGSizeEqualToSize(imageSize, targetSize)) { CGFloat widthFactor = targetWidth / width; CGFloat heightFactor = targetHeight / height; if (widthFactor < heightFactor) scaleFactor = widthFactor; else scaleFactor = heightFactor; scaledWidth = roundf(width * scaleFactor); scaledHeight = roundf(height * scaleFactor); // center the image if (widthFactor < heightFactor) { thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5; } else if (widthFactor > heightFactor) { thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5; } } UIGraphicsBeginImageContext(targetSize); CGRect thumbnailRect = CGRectZero; thumbnailRect.origin = thumbnailPoint; thumbnailRect.size.width = scaledWidth; thumbnailRect.size.height = scaledHeight; [sourceImage drawInRect:thumbnailRect]; newImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); if (newImage == nil) NSLog(@"could not scale image"); return newImage; } } </code></pre>

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