I have an app which consists of three layers of view controllers: UITabBarController => UINavigationController => UIViewController. They are all generated in code rather than using IB. The tab bar is on the bottom as per the usual design guidelines. In my UIViewController I am using this code to present the modalViewController:
myModalVC = [[MyModalViewController alloc] init];
[self.navigationController presentModalViewController:myModalVC animated:YES];
This work fine and the modal view controller pops up and covers the entire screen.
However when a button is pressed within the modal view controller, I run this:
[self dismissModalViewControllerAnimated:YES];
And the modal view controller animates away. However I can see the original UIViewcontroller view but the tab bar disappears completely. I've googled a lot but I can't find anyone that has this same problem.
You should delegate your modal view controller to your parent view controller. [self dismissModalViewControllerAnimated:YES]; should be done by the delegate and not the modal view itself, parent view are responsible for dismissing the modal view.
Actually I found this by googling a bit more. I made my tab bar controller a property of the app delegate and when it presents the modal vc, it does this
UIApplication *myApp = [UIApplication sharedApplication];
noIBAppDelegate*appDelegate = (noIBAppDelegate*)myApp.delegate;
[appDelegate.tabBarController presentModalViewController:myModalVC animated:YES];
Then it dismisses it by this bit of code
UIApplication *myApp = [UIApplication sharedApplication];
noIBAppDelegate*appDelegate = (noIBAppDelegate*)myApp.delegate;
[appDelegate.tabBarController dismissModalViewControllerAnimated:YES];
This fixes the the tab bar disappearing.
Try
[self.navigationController dismissModalViewControllerAnimated:YES];
Thanks for your answer! I had the same problem, but I'm writing in Swift, so thought I'd include my solution that I figured out from looking at yours. I only had to use these two lines to fix the problem. Nothing else was needed.
tabBarController?.presentViewController(viewController, animated: true, completion: nil)
and
tabBarController?.dismissViewControllerAnimated(true, completion: nil)
I should also mention that the line: tabBarController?.delegate = self, is in the viewDidLoad function of my NavigationController.
Related
I have this code:
-(void)applicationDidBecomeActive:(UIApplication *)application {
JUnlockController *passcodeView = [[JUnlockController alloc] init];
[self.navigationController presentModalViewController:passcodeView animated:YES];
}
The problem is, when i have a modal view controller open in my app, it doesn't appear on top of it. I want to be able to find out which is the current viewcontroller that the user is looking at, so I can display it on top of there.
Instead of:
[self.navigationController presentModalViewController:passcodeView animated:YES];
use:
[self presentModalViewController:passcodeView animated:YES];
If your app is only navigated by that nav controller, you can ask it which viewController is visible:
[self.navigationController.visibleViewController presentModalViewController:passcodeView animated:YES];
Or else you can leverage the UIApplicationDidBecomeActiveNotification by having all ov your view controllers extend a custom class which registers for this on viewWillAppear and unregisters in viewWillDissapear; and in your custom base class you implement the callback which displays your modal.
edit note that this assumes you have a self.navigationController in your app delegate (which you setup). You may need to use something like self.window.rootViewController instead.
How can i go back 2 or 3 views back without using navigation controller? That is in my app, there is a main menu view. i want to reach that menu from all the other pages (from multiple views). How can this be implemented? with
[self dismissModalViewControllerAnimated:YES]; this cannot be implemented i suppose.
Anybody please help me..
I found the solution.
Of course you can find the solution in the most obvious place so reading from the UIViewController reference for the dismissModalViewControllerAnimated method ...
If you present several modal view controllers in succession, and thus build a stack of modal view controllers, calling this method on a view controller lower in the stack dismisses its immediate child view controller and all view controllers above that child on the stack. When this happens, only the top-most view is dismissed in an animated fashion; any intermediate view controllers are simply removed from the stack. The top-most view is dismissed using its modal transition style, which may differ from the styles used by other view controllers lower in the stack.
so it's enough to call the dismissModalViewControllerAnimated on the target View. I used the following code:
[[[[[self parentViewController] parentViewController] parentViewController] parentViewController] dismissModalViewControllerAnimated:YES];
to go back to my home.
Copied from here
"Going 2 views back without navigation controller"
Hmmm, I'm not sure if this misses the point, but the easiest way to do this is to use the popToRootViewControllerAnimated in the Navigation Controller:
[self.navigationController popToRootViewControllerAnimated:TRUE];
So, supposing you had a series of three screens in a Navigation Controller, and on the third screen you wanted the "Back" button to take you back to the initial screen.
On the third screen, you would add this code:
-(void)viewDidLoad
{
[super viewDidLoad];
// change the back button and add an event handler
self.navigationItem.leftBarButtonItem =
[[UIBarButtonItem alloc] initWithTitle:#"Back"
style:UIBarButtonItemStyleBordered
target:self
action:#selector(handleBack:)];
}
-(void)handleBack:(id)sender
{
NSLog(#"About to go back to the first screen..");
[self.navigationController popToRootViewControllerAnimated:TRUE];
}
Do you want to go "two or three VIEWS back"? Use removeFromSuperview? Or are you talking about ViewControllers?
Are you using Storyboard?
If yes do:
- (void)showModalAssistantViewController
{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"AssistantStoryboard" bundle:nil];
AssistantRootViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:#"AssistantNavigationController"];
[viewController setModalPresentationStyle:UIModalPresentationFullScreen];
[viewController setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[self.navigationController presentModalViewController:viewController animated:YES];
//... or pushToViewController ... whatever, you get the point.
}
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES];
So I have a tabBarController as a modalview, and it shows up fine. As I click some of the tabs, the views are loading properly. I want to dismiss the modalView when I click on tabBarController.selectedIndex ==4
So I write in the viewDidLoad and also tried in the viewWillAppear of that view controller to dismissModalViewController and it does not work.
I tried
[self.parentViewController dismissModalViewControllerAnimated:YES];
// ... And also //
[self dismissModalViewControllerAnimated:YES];
Could someone point out why it does not work ?
All you have to do is pass a reference to the modally presented VC pointing on the VC that will present it modally.
Define a weak reference as a property in the UITabBarController subclass, and send a message to dismiss it when required.
For example using a property named mainViewController :
MySubclass *tbController = [[MySubclass ....];
tbController.mainViewController = self;
[self presentModalViewController:tbController animated:YES];
Then in MySubclass define
#property(assign) UIViewController *mainViewController;
and synthesize it, then when the tab you want gets selected :
[self.mainViewController dismissModalViewControllerAnimated:YES];
I think the 4th view controller (of the tab bar controller) is trying to get dismissed by the line
[self.parentViewController dismissModalViewControllerAnimated:YES];
Since this 4th view controller was not presented by any controller, this wont work.
And it is dismissing it's modal view controller by the line
[self dismissModalViewControllerAnimated:YES];
Since, this 4th view controller did not presented any view controller, this again should not work.
You want to dismiss the tab bar controller and not its 4th view controller.
Basically, you can get the reference of tab bar controller from the 4th view controller.
As, [yourFourthViewController.tabBarController.parentViewController dismissModalViewControllerAnimated:YES];
I am guessing this without actually trying. Let me know if this works.
If you have the UINavigationController as the parent controller then the following line will work for you.
[self dismissModalViewControllerAnimated:YES];
But here I think you have the UIViewController is the parent controller instead of the UINavigationController. So, You can do one thing when presentModalViewController.
if(objView == nil)
objView = [[YourViewController alloc] initWithNibName:#"YourViewController" bundle:nil];
UINavigationController *navigationController1 = [[UINavigationController alloc] initWithRootViewController:objView];
[self presentModalViewController:navigationController1 animated:YES];
Let me know if you need more help or any questions.
I have a subclass of TTMessageController that shows ... BUT it is not animated even though it should be. The code that displays the modal view looks like this (where PostToWebMessageController is the subclass of TTMessageController:
if (self.toWebMsgController == nil) {
self.toWebMsgController = [[PostToWebMessageController alloc] init];
}
UINavigationController *navController = [[UINavigationController alloc] init];
[navController pushViewController:self.toWebMsgController animated:NO];
[self presentModalViewController:navController animated:YES];
What happens though is this: The screen goes black ... the keyboard scrolls up into view ... and THEN the TTMessageController view shows up (not animated). When I dismiss the view via a Cancel button the screen goes black and then just disappears (no animation again).
Any ideas why this is happening? I've this with a number of other TT* controllers and I can't get one to animate right with showing modally.
Thanks
UPDATE:
This is happening in EVERY UIViewController that I try to present modally. Screen goes black, keyboard animates upwards and then view displays. Any ideas why this might be happening???
A day to figure this out ... hopefully someone will benefit from my pains!
Here is what is happening:
The UIViewController calling presentModalViewController is itself nested inside a UIScrollView that is contained in ANOTHER UIViewController. Apparently, cocoa touch doesn't much like this. Anyhow, to rectify the problem I did the following:
Add a property of type UIViewController to the UIViewController that will present a modal view controller (e.g. #property (nonatomic, retain) UIViewController *owningController;)
Set that property = to the topmost UIViewController (the one that contains the UIScrollView in this case)
In the UIViewController that shows the modal view ... change this
[self presentModalViewController:controller animated:YES];
to this ...
[owningController presentModalViewController:controller animated:YES];
I'm not sure why you are using a UINavigationController. If it is because you would like your toWebMsgController controller to have a nav bar when it loads in the modal view, try the following alterations to your code:
if (self.toWebMsgController == nil) {
self.toWebMsgController = [[PostToWebMessageController alloc] init];
}
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:toWebMsgController];
//[navController pushViewController:self.toWebMsgController animated:NO];
[self presentModalViewController:navController animated:YES];
If you don't require a nav bar in your modal view, you probably don't need a UINavigationController at all.
I had same issue.
Check that you root controller (if you present controller over it) for presentationStyle DOES NOT set to UIModalPresentationCurrentContext
I have a view that I want to take up the full screen, so I override the init method, and some of the view methods:
- (id) init {
if (self = [super init]) {
self.wantsFullScreenLayout = YES;
}
return self;
}
- (void) viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
}
- (void) viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[[UIApplication sharedApplication] setStatusBarHidden:NO animated:YES];
}
Now, from another screen, I want to display it as a modal view:
UIViewController *screen = [[MyScreen alloc] init];
[self presentModalViewController:screen];
[screen release];
All pretty standard stuff. When I want the full-screen view to go away, however, the previous view is shifted or stretched up by about 40 pixels.
Specificially, I have a UITabBarController with a UINavigationController inside, displaying a UITableViewController, which is the view that displays the subview, and also the view that gets shifted up. If the table is not in a navigation controller, everything works just fine, nothing gets shifted up at all. If I experiment with commenting out the wantsFullScreenLayout and setStatusBarHidden lines with no navigation bar, it sometimes shifts up just 20 pixels, or doesn't actually display on the full screen (but later it does without changing any code), or sometimes doesn't break at all (but I am not getting the full full screen with any of these)
What am I doing wrong?
Through some combination of Sean's suggestion and jumping up the responder chain, I've found a solution that works is what seems like all circumstances (so far).
First issue:
The Table View by itself does not display in a navigation controller, but may show up in one if being selected from the more view in the tab bar, and that's the case where displaying the modal view in full screen causes the table to underlap the navigation bar upon return.
Second issue:
When not displayed in a navigation controller, presenting the modal view does not take up the full screen (even though wantsFullScreenLayout is set to YES). When returning from this view, the view is shifted up by 20 pixels and you can see a gap between the bottom of the table and the top of the tab bar.
Solution:
- (void) viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:YES animated:NO];
[self.navigationController setNavigationBarHidden:NO animated:NO];
}
- (void) presentModalViewController:(UIViewController *)screen animated:(BOOL)animated {
UIResponder *responder = self;
while (responder && ![responder isKindOfClass:[UITabBarController class]]) {
responder = [responder nextResponder];
}
[(UIViewController *)responder presentModalViewController:screen animated:YES];
}
The toggling of the navigation bar's visibility forces the relayout. Overriding presentModalViewController actually calls presentModalViewController on the tab bar controller instead, which then causes it to show in the full screen. For some reason, self.tabBarController is nil when not in the more view controller, so I had to jump up the responder chain to find it.
Your UINavigationController will get called with the viewWillAppear before the modal view is dismissed. Have you tried calling [[UIApplication sharedApplication] setStatusBarHidden:NO animated:NO]; inside the controllers that can be visible post modal dismissal. I have run into tons of problems displaying modal views on top of UINavigationControllers when bounds change. It fights any layout changes and requires lots of resetting to previous states to get it behaving nicely. It might also not hurt to call [self.navigationController setNavigationBarHidden:NO animated:NO] as well to force layout.
If this works well it might serve you to create a simple baseclass that sets these in it's viewWillAppear and then just subclass it for all non modal view controllers.
If this doesn't work you might try placing a swap view at the top level that contains the tab bar controller and then you could remove the tab bar controller with a transition when you present your modal view. Yes this isn't technically modal but would still look nice and offer the same effect. At that time since the view controller is out of the view hierarchy it shouldn't get it's layout all munged.
I think this has to do with the timing of the presentModalViewController: call. As a test you could try adding sleep(3) before you call that method. If that fixes anything, or even if it doesn't i guess I would try moving the order of things around. maybe viewDidDisappear and viewDidAppear instead of 'Will'