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//the following is appropriate call to do this if img is the UIImage instance. //img=[img scaleProportionalToSize:CGSizeMake(320, 480)]; @interface UIImage (UIImageFunctions) - (UIImage *) scaleToSize: (CGSize)size; - (UIImage *) scaleProportionalToSize: (CGSize)size; @end @implementation UIImage (UIImageFunctions) - (UIImage *) scaleToSize: (CGSize)size { // Scalling selected image to targeted size CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, size.width, size.height, 8, 0, colorSpace, kCGImageAlphaPremultipliedLast); CGContextClearRect(context, CGRectMake(0, 0, size.width, size.height)); if(self.imageOrientation == UIImageOrientationRight) { CGContextRotateCTM(context, -M_PI_2); CGContextTranslateCTM(context, -size.height, 0.0f); CGContextDrawImage(context, CGRectMake(0, 0, size.height, size.width), self.CGImage); } else CGContextDrawImage(context, CGRectMake(0, 0, size.width, size.height), self.CGImage); CGImageRef scaledImage=CGBitmapContextCreateImage(context); CGColorSpaceRelease(colorSpace); CGContextRelease(context); UIImage *image = [UIImage imageWithCGImage: scaledImage]; CGImageRelease(scaledImage); return image; } - (UIImage *) scaleProportionalToSize: (CGSize)size1 { if(self.size.width>self.size.height) { NSLog(@"LandScape"); size1=CGSizeMake((self.size.width/self.size.height)*size1.height,size1.height); } else { NSLog(@"Potrait"); size1=CGSizeMake(size1.width,(self.size.height/self.size.width)*size1.width); } return [self scaleToSize:size1]; } @end |