Heavy inspiration drawn from https://github.com/Rheeseyb/RBParallaxTableViewController and https://github.com/tapi/PXParallaxViewController. Much credit to both of those projects, as I probably wouldn't have had a good enough understanding of parallax without reading through their code. I wanted a parallax view that had an image (UIPageControl) indicator, allowed you to add images after the view controller was initialized, and had a parallax effect while scrolling down instead of just while scrolling up (as Path does it).
GKLParallaxPicturesViewController *paralaxViewController = [[GKLParallaxPicturesViewController alloc] initWithImages:uiimagesArray andContentView:contentView];
Where contentView is the detailed view you want below your images. You can always add more images after the view controller is instantiated by calling:
[paralaxViewController addImages:moarImages];
GKLParallaxPictures accepts both UIImages and NSStrings (of an image URL) for adding UIImageViews into the top gallery. By default it uses dispatch_queue to load images asynchronously, but you can subclass GKLParallaxPictures and overwrite this method to handle image loading however you choose.
Default image loading:
-(void)loadImageFromURLString:(NSString*)urlString forImageView:(UIImageView*)imageView{
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);
dispatch_async(queue, ^{
NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:urlString]];
dispatch_sync(dispatch_get_main_queue(), ^{
UIImage *downloadedImage = [[UIImage alloc] initWithData:imageData];
[imageView setImage:downloadedImage];
});
});
}
Image loading with SDWebImage:
-(void)loadImageFromURLString:(NSString*)urlString forImageView:(UIImageView*)imageView{
[imageView setImageWithURL:[NSURL URLWithString:urlString]];
}
Currently there is only one delegate method, imageTapped:. Implementing this and setting a parallaxDelegate will give you a callback whenever the picture gallery is double tapped by the user, along with the UIImage that was tapped.
