One other thing, in your code you center the image, but it's not the case all time, i just want when i (pinch out/ double tape) to comeback to the original display. Thanks.

The cocoawithlove site has some very informative articles. The link that you posted addresses zooming and also scaling while rotating the image in tandem with the screen (i.e. at a 45 degree turn the image diagonal has been sized to the screen width). It looks very slick. Handling rotation wasn't part of your original post. Your original post addressed making images go to full screen if not full screen, and reduce to original size if full screen. The cocoawithlove link does this nicely, (as does mine, without the cool rotation and no eyecandy, but I was only trying to demonstrate function not form) but if you have run the code, you can see that the image "fills" the screen with a border. Running the project with different aspect ratio images results in different borders. None of them completely fill the screen. In the cocoawithlove example, even if the image was proportional to the screen (320 x 460), by design he has a black border around the image.
Regarding having images not necessarily being centered, you simply need to store a CGPoint with the original location (either the origin or center) and when doing the CGAffineTransform exiting full screen, set the image's location at that point.

Bob

Thanks, you're right in my post i don't said any thing about rotation because i want just a full screen with pinch and tap. Can i integrate a border to fill the screen let's say black border? Thanks.

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A border can be added. The cocoawithlove link project handles it that way. Check out how the GradientBackgroundView is implemented and used in that example.

Bob

Thank you very much. my problem is now solved really big thanks for your effort and great code .

Regards.

I am glad you have solved your problem.

Bob