Question

Is there such a thing as an “on load complete” for images in iphone?

I want to be able to destroy a UIActivity indicator once and image is loaded.

What the general best practice for doing this?

Answer 1

If you simply want to dismiss a UIActivityIndicatorView after a UIImage has been loaded and displayed properly in a UIImageView, you can try the following:

- (void)loadImageAtPath:(NSString*)path
{
    // show the indicator
    [_myIndicatorView startAnimating];

    // give UIKit a chance to setup and draw the view hierarchy:
    [self performSelector:@selector(_loadImageAtPath:)
               withObject:path
               afterDelay:0];
}

- (void)_loadImageAtPath:(NSString*)path
{
    // load the image
    _myImageView.image = [UIImage imageWithContentsOfFile:path];

    // force the image to load and decompress now
    _myImageView.image.CGImage

    // image is ready, so we can remove the indicator view
    [_myIndicatorView removeFromSuperview];
}

I have to admit, I did not test the above code. Please leave a comment if it works.