If you have a gif image and you want to show it in UIImageView, then one method is to split all images from gif and use startAnimation method of UIImageView.

To split the gif, you can use this command

convert +adjoin loading.gif out%d.gif
After you get all images, you can use following code to display these in a UIImageView,

UIImageView* animatedImageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
animatedImageView.animationImages = [NSArray arrayWithObjects:    
                               [UIImage imageNamed:@"image1.gif"],
                               [UIImage imageNamed:@"image2.gif"],
                               [UIImage imageNamed:@"image3.gif"],
                               [UIImage imageNamed:@"image4.gif"], nil];
animatedImageView.animationDuration = 1.0f;
animatedImageView.animationRepeatCount = 0;
[animatedImageView startAnimating];
[self.view addSubview: animatedImageView];

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