PhotoViewer provides a method for displaying images from Web or local file. it includes SDWebImage so it has features that SDWebImage has.

Just draging class files to your project.

Getting start with PhotoViewer is dead simple. Just initialize it with delegate. Like this: self.pvc = [[PhotoViewer alloc] initWithDelegate:self];

If you want to display a specific index of photo when PhotoViewer shows, you should assign a number to "currentPageIndex", Like this: self.pvc.currentPageIndex = 3;

PhotoViewr provides view controller Animated transition if implements transitionDelegate of PhotoViewer class. Like this: self.pvc.transitioningDelegate = self;

Then you must implement:

• (id)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source { if ([presented isKindOfClass:PhotoViewer.class]) { return [[ImageZoomPresentAnimation alloc] initWithReferenceImageView:[self referenceImageView]]; } return nil; }

• (id)animationControllerForDismissedController:(UIViewController *)dismissed { if ([dismissed isKindOfClass:PhotoViewer.class]) { return [[ImageZoomPresentAnimation alloc] initWithReferenceImageView:[self referenceImageView]]; } return nil; }

You should take responsibility for calculating the right position of image view. If images is in a table view cell, you should use convertRect:fromView: method to calculate the frame. Maybe like this: [self.view convertRect:imageView fromView: cell]; If images is in a UIView, maybe you can just pass the frame of image view itself. Both two situations mentioned above are in the Demo project.

PhotoViewer has several delegate methods:

@protocol PhotoViewerDelegate

• (void)dismissViewController;

• (NSUInteger)numberOfPhotos;

• (UIImage *)photoViewer: (PhotoViewer *)photoViewer thumbnailAtIndex: (NSUInteger)index;

@optional // Uses photoViewer:photoAtIndex: first

• (UIImage *)photoViewer: (PhotoViewer *)photoViewer photoAtIndex: (NSUInteger)index; // If can not find photoViewer:photoAtIndex:, then uses photoViewer:photoUrlAtIndex:
• (NSString *)photoViewer: (PhotoViewer *)photoViewer photoUrlAtIndex: (NSUInteger)index;

@end

PhotoViewer will call photoViewer:photoAtIndex: first. If it can't get a UIImage Object, then it calls photoViewer:photoUrlAtIndex: . thumnail is used as placeholder when downloading images from Internet and also used for view controller transition.

You'd better implement the dismissViewController method, and note that only if you call the dissmissViewControllerAnimated: completion: method with animated: YES, PhotoViewer can perform animation while dismissing.