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Scale a UIImage to any given rect keeping the aspect ratio
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| @implementation UIImage (scale) | |
| /** | |
| * Scales an image to fit within a bounds with a size governed by | |
| * the passed size. Also keeps the aspect ratio. | |
| * | |
| * Switch MIN to MAX for aspect fill instead of fit. | |
| * | |
| * @param newSize the size of the bounds the image must fit within. | |
| * @return a new scaled image. | |
| */ | |
| - (UIImage *)scaleImageToSize:(CGSize)newSize { | |
| CGRect scaledImageRect = CGRectZero; | |
| CGFloat aspectWidth = newSize.width / self.size.width; | |
| CGFloat aspectHeight = newSize.height / self.size.height; | |
| CGFloat aspectRatio = MIN ( aspectWidth, aspectHeight ); | |
| scaledImageRect.size.width = self.size.width * aspectRatio; | |
| scaledImageRect.size.height = self.size.height * aspectRatio; | |
| scaledImageRect.origin.x = (newSize.width - scaledImageRect.size.width) / 2.0f; | |
| scaledImageRect.origin.y = (newSize.height - scaledImageRect.size.height) / 2.0f; | |
| UIGraphicsBeginImageContextWithOptions( newSize, NO, 0 ); | |
| [self drawInRect:scaledImageRect]; | |
| UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext(); | |
| UIGraphicsEndImageContext(); | |
| return scaledImage; | |
| } | |
| @end |
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