Rotating UIImage give blank UIImage - iphone

Question

I Want to rotate UIImage in 90 degrees with this method :
static inline double radians (double degrees) {return degrees * M_PI/180;}
UIImage* rotate(UIImage* src, UIImageOrientation orientation)
{
UIGraphicsBeginImageContext(src.size);
CGContextRef context = UIGraphicsGetCurrentContext();
if (orientation == UIImageOrientationRight) {
CGContextRotateCTM (context, radians(90));
} else if (orientation == UIImageOrientationLeft) {
CGContextRotateCTM (context, radians(-90));
} else if (orientation == UIImageOrientationDown) {
// NOTHING
} else if (orientation == UIImageOrientationUp) {
CGContextRotateCTM (context, radians(90));
}
[src drawAtPoint:CGPointMake(0, 0)];
return UIGraphicsGetImageFromCurrentImageContext();
}
the problem is that it give me a blank UIImage

Answer 1

Here is the code :-
UIImage *PortraitImage;
PortraitImage = [[UIImage alloc] initWithCGImage: currentImage.CGImage
scale: 1.0
orientation: UIImageOrientationLeft];
if you want to rotate UIImage at some particular angle then you can use CIIFilter to rotate at whatever angle you want but that is possible in IOS 5.0
CIImage *inputImage = [[CIImage alloc] initWithImage:[UIImage imageNamed:#"old-country-rain.jpg"]];
CIFilter *RotateFilter = [CIFilter filterWithName:#"CIStraightenFilter"];
[RotateFilter setValue:[NSNumber numberWithFloat: 1.04667f] forKey:#"inputAngle"];
[RotateFilter setValue:inputImage forKey:kCIInputImageKey];
CIImage *displayImage = RotateFilter.outputImage;
UIImage *finalImage = [UIImage imageWithCIImage:displayImage];