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copied!<p>After multiple trials here is how I got it working for what I wanted. This is what I was trying. - I have a view with a image. and I wanted to have the image go full screen. - I have a navigation controller with a tabBar too. So i need to hide that too. - Also, my main requirement was not just hiding, but having a fading effect too while showing and hiding.</p> <p>This is how I got it working. </p> <p>Step 1 - I have a image and user taps on that image once. I capture that gesture and push it into the new <code>imageViewController</code>, its in the <code>imageViewController</code>, I want to have full screen image.</p> <pre><code>- (void)handleSingleTap:(UIGestureRecognizer *)gestureRecognizer { NSLog(@"Single tap"); ImageViewController *imageViewController = [[ImageViewController alloc] initWithNibName:@"ImageViewController" bundle:nil]; godImageViewController.imgName = // pass the image. godImageViewController.hidesBottomBarWhenPushed=YES;// This is important to note. [self.navigationController pushViewController:godImageViewController animated:YES]; // If I remove the line below, then I get this error. [CALayer retain]: message sent to deallocated instance . // [godImageViewController release]; } </code></pre> <p>Step 2 - All these steps below are in the ImageViewController</p> <p>Step 2.1 - In ViewDidLoad, show the navBar</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. NSLog(@"viewDidLoad"); [[self navigationController] setNavigationBarHidden:NO animated:YES]; } </code></pre> <p>Step 2.2 - In <code>viewDidAppear</code>, set up a timer task with delay ( I have it set for 1 sec delay). And after the delay, add fading effect. I am using alpha to use fading.</p> <pre><code>- (void)viewDidAppear:(BOOL)animated { NSLog(@"viewDidAppear"); myTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(fadeScreen) userInfo:nil repeats:NO]; } - (void)fadeScreen { [UIView beginAnimations:nil context:nil]; // begins animation block [UIView setAnimationDuration:1.95]; // sets animation duration self.navigationController.navigationBar.alpha = 0.0; // Fades the alpha channel of this view to "0.0" over the animationDuration of "0.75" seconds [UIView commitAnimations]; // commits the animation block. This Block is done. } </code></pre> <p>step 2.3 - Under <code>viewWillAppear</code>, add singleTap gesture to the image and make the navBar translucent. </p> <pre><code>- (void) viewWillAppear:(BOOL)animated { NSLog(@"viewWillAppear"); NSString *path = [[NSBundle mainBundle] pathForResource:self.imgName ofType:@"png"]; UIImage *theImage = [UIImage imageWithContentsOfFile:path]; self.imgView.image = theImage; // add tap gestures UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)]; [self.imgView addGestureRecognizer:singleTap]; [singleTap release]; // to make the image go full screen self.navigationController.navigationBar.translucent=YES; } - (void)handleTap:(UIGestureRecognizer *)gestureRecognizer { NSLog(@"Handle Single tap"); [self finishedFading]; // fade again. You can choose to skip this can add a bool, if you want to fade again when user taps again. myTimer = [NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(fadeScreen) userInfo:nil repeats:NO]; } </code></pre> <p>Step 3 - Finally in <code>viewWillDisappear</code>, make sure to put all the stuff back </p> <pre><code>- (void)viewWillDisappear: (BOOL)animated { self.hidesBottomBarWhenPushed = NO; self.navigationController.navigationBar.translucent=NO; if (self.navigationController.topViewController != self) { [self.navigationController setNavigationBarHidden:NO animated:animated]; } [super viewWillDisappear:animated]; } </code></pre>

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