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.
This is how I got it working.
Step 1 - I have a image and user taps on that image once. I capture that gesture and push it into the new imageViewController, its in the imageViewController, I want to have full screen image.
- (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];
}
Step 2 - All these steps below are in the ImageViewController
Step 2.1 - In ViewDidLoad, show the navBar
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
NSLog(@"viewDidLoad");
[[self navigationController] setNavigationBarHidden:NO animated:YES];
}
Step 2.2 - In viewDidAppear, 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.
- (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.
}
step 2.3 - Under viewWillAppear, add singleTap gesture to the image and make the navBar translucent.
- (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];
}
Step 3 - Finally in viewWillDisappear, make sure to put all the stuff back
- (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];
}
