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copied!<p><a href="http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-the-right-way/" rel="nofollow noreferrer">resize-a-uiimage-the-right-way</a> explains some of the issues many code samples for doing this have, and has some code snippets to help deal with UIImages - the private helper method in UIImage+resize.m accepts a transform to allow rotation, so you'd just need to expose that as a public interface.</p> <pre><code>// Returns a copy of the image that has been transformed using the given affine transform and scaled to the new size // The new image's orientation will be UIImageOrientationUp, regardless of the current image's orientation // If the new size is not integral, it will be rounded up - (UIImage *)resizedImage:(CGSize)newSize transform:(CGAffineTransform)transform drawTransposed:(BOOL)transpose interpolationQuality:(CGInterpolationQuality)quality { CGRect newRect = CGRectIntegral(CGRectMake(0, 0, newSize.width, newSize.height)); CGRect transposedRect = CGRectMake(0, 0, newRect.size.height, newRect.size.width); CGImageRef imageRef = self.CGImage; // Build a context that's the same dimensions as the new size CGContextRef bitmap = CGBitmapContextCreate(NULL, newRect.size.width, newRect.size.height, CGImageGetBitsPerComponent(imageRef), 0, CGImageGetColorSpace(imageRef), CGImageGetBitmapInfo(imageRef)); // Rotate and/or flip the image if required by its orientation CGContextConcatCTM(bitmap, transform); // Set the quality level to use when rescaling CGContextSetInterpolationQuality(bitmap, quality); // Draw into the context; this scales the image CGContextDrawImage(bitmap, transpose ? transposedRect : newRect, imageRef); // Get the resized image from the context and a UIImage CGImageRef newImageRef = CGBitmapContextCreateImage(bitmap); UIImage *newImage = [UIImage imageWithCGImage:newImageRef]; // Clean up CGContextRelease(bitmap); CGImageRelease(newImageRef); return newImage; } </code></pre> <p>This is the license from that file:</p> <pre><code>// Created by Trevor Harmon on 8/5/09. // Free for personal or commercial use, with or without modification. // No warranty is expressed or implied. </code></pre>

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