Rotate UIImage without quality loss - ios

Question

I have a problem to rotate UIImage without quality loss. Now I am using ready method provided by BFKit imageRotatedByDegrees:, but my image become diffused (blurred).
Sample code:
UIImage *image = [[UIImage imageNamed:#"car"] imageRotatedByDegrees:(((float)arc4random() / ARC4RANDOM_MAX) * (360))];
Code of imageRotatedByDegrees: :
- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees
{
// calculate the size of the rotated view's containing box for our drawing space
UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.size.width, self.size.height)];
CGAffineTransform t = CGAffineTransformMakeRotation(DegreesToRadians(degrees));
rotatedViewBox.transform = t;
CGSize rotatedSize = rotatedViewBox.frame.size;
// Create the bitmap context
UIGraphicsBeginImageContext(rotatedSize);
CGContextRef bitmap = UIGraphicsGetCurrentContext();
// Move the origin to the middle of the image so we will rotate and scale around the center.
CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2);
// // Rotate the image context
CGContextRotateCTM(bitmap, DegreesToRadians(degrees));
// Now, draw the rotated/scaled image into the context
CGContextScaleCTM(bitmap, 1.0, -1.0);
CGContextDrawImage(bitmap, CGRectMake(-self.size.width / 2, -self.size.height / 2, self.size.width, self.size.height), [self CGImage]);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Is there another way to rotate UIImage without quality loss?

Answer 1

I'm the author of BFKit, and when I read about your question I investigated about that issue.
In the latest version (1.6.4) I've fixed that!
Now the image will no more be diffused (blurred).

Answer 2

My aim was to rotate an image that was in my MKAnnotationView. So I solved the problem by rotating not image, but whole MKAnnotationView.
An answer which helped me is this.
My code in MKMapViewDelegate method mapView:viewForAnnotation::
annotationView.transform = CGAffineTransformMakeRotation((((float)arc4random() / ARC4RANDOM_MAX) * (360)));