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- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.mediaFocusManager = [[ASMediaFocusManager alloc] init];
    self.mediaFocusManager.delegate = self;
    // Tells which views need to be focusable. You can put your image views in an array and give it to the focus manager.
    [self.mediaFocusManager installOnViews:self.imageViews];
}

#pragma mark - ASMediaFocusDelegate
// Returns an image that represents the media view. This image is used in the focusing animation view.
// It is usually a small image.
- (UIImage *)mediaFocusManager:(ASMediaFocusManager *)mediaFocusManager imageForView:(UIView *)view
{
    return ((UIImageView *)view).image;
}

// Returns the final focused frame for this media view. This frame is usually a full screen frame.
- (CGRect)mediaFocusManager:(ASMediaFocusManager *)mediaFocusManager finalFrameforView:(UIView *)view
{
    return self.parentViewController.view.bounds;
}

// Returns the view controller in which the focus controller is going to be added.
// This can be any view controller, full screen or not.
- (UIViewController *)parentViewControllerForMediaFocusManager:(ASMediaFocusManager *)mediaFocusManager
{
    return self.parentViewController;
}

// Returns a local media path, it must be an image path. This path is used to create an image at full screen.
- (NSString *)mediaFocusManager:(ASMediaFocusManager *)mediaFocusManager mediaPathForView:(UIView *)view
{
    NSString *path;
    NSString *name;
    
    // Here, images are accessed through their name "1f.jpg", "2f.jpg", …
    name = [NSString stringWithFormat:@"%df", ([self.imageViews indexOfObject:view] + 1)];
    path = [[NSBundle mainBundle] pathForResource:name ofType:@"jpg"];
    
    return path;
}