How can I rotate UIImage on clicking rotate button

Question

I would like to rotate UIImage not the UIImageView on clicking rotate button not on orientation change. Please reply.

Answer 1

Edited:

use http://developer.apple.com/library/ios/documentation/uikit/reference/UIImage_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40006890-CH3-SW37 for IOS 4 , if you want to rotate image

or you can use: http://www.platinumball.net/blog/2010/01/31/iphone-uiimage-rotation-and-scaling/

or

• http://blog.logichigh.com/2008/06/05/uiimage-fix/

Answer 2

You can use imageWithCGImage:scale:orientation: (available from 4.0)

Answer 3

CGSize size =  sizeOfImage;
UIGraphicsBeginImageContext(size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextRotateCTM(ctx, angleInRadians);
CGContextDrawImage(UIGraphicsGetCurrentContext(),
  CGRectMake(0,0,size.width, size.height),
  image);

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;