I have some view controller, and when I click some button I make modalView (wrapped with UINavigationController) and present it.
DscViewController *enterDescription = [[[DscViewController alloc] init] autorelease];
UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:enterDescription];
[self presentModalViewController:navController animated:YES];
[navController release];
The question is, how to make my (parent)view controller to be delegate, and when I click on some button at modalViewController (Done for example) to call some method in my parent viewController to dismiss modal and do some savings from modal input?
I don't think that it's good practice to make one controller blame its parent controller to do work that it should handel. You can always use self.parentViewController to dismiss the modal you are currently in.
If for some reason you only handle storage in the parentViewController then you can point your done button action to a method in your current viewController and then use self.parentViewController to trigger the parent method for storage.
or just set your buttons delegate directly to self.parentViewController
[button addTarget:self.parentViewController action:#selector(someMethodInParentViewController) forControlEvents:UIControlEventTouchUpInside];
Related
I am using this code to hide a button in a different view controller, but the button does not get hidden when the button is pressed to hide the button in the other view controller.
This is the code I am using to hide the button in the other view controller:
[self dismissModalViewControllerAnimated:YES];
NSLog(#"Exited");
ViewController *vc = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
[vc.mainbutton1 setHidden:YES];
Why is this not working?
Thanks!
take a BOOL variable in ViewController controller and make the property and synthesize also.
and do this.
ViewController *vc = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
vc.check = YES;
in the view controller viewdidload
write this
if(self.check)
[mainbutton1 set hidden:YES];
The other answers should work unless...
Judging by your code I am going to guess that you are trying to hide a button on the viewController that presented the modal view?
If this is correct then what you are doing will not work as you are creating a new instance of ViewController which is not the already existing viewController you want to use.
Although the docs say that it is fine to call [self dismissModalViewControllerAnimated:YES]; from the presented modal view I tend to set up a delegate to handle the dismissal like in Apple's utitliy app template.
The reason this isn't working is because even though you have alloc'd and init'd the ViewController properly, the actual elements of that vc ViewController (including mainbutton1) have not been loaded yet.
Hitman has the right idea (and I'm voting his idea up).
Either put in a BOOL property for setting mainButton1 to hidden when the view appears, or call your [mainButton1 setHidden: YES] right after you explicitly display the view (via animation or adding subviews or whatever).
From your question it sounds like you want to hide the button in an existing view controller, whereas in your code you are creating a new one
ViewController *vc = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
[vc.mainbutton1 setHidden:YES];
Either the view controller which you observe is not the one you expect or the mainbutton1 outlet is not connected properly. You can check if the memory controller is the one you expect by logging its memory address.
NSLog(#"Hid button for view controller %p", vc);
And doing the same in the viewDidAppear callback of ViewController
NSLog(#"In viewDidAppear for view controller %p", self);
It seems you want a certain button to be hidden if something has been happening somewhere else.
You COULD, somewhat as a hack (but I don't mind that very much) control this with a variable on your AppDelegate for instance.
When the "something" is happening "somewhere else", do this:
MyAppDelegate *appDelegate = [[(MyAppDelegate *)UIApplication sharedApplication] delegate];
appDelegate.shouldHideThatOtherButtonLater = YES;
Then, when you create your new ViewController later on you could use this value to determine if your button should be visible or not like this:
ViewController *vc = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
MyAppDelegate *appDelegate = [[(MyAppDelegate *)UIApplication sharedApplication] delegate];
[vc.mainbutton1 setHidden: appDelegate.shouldHideThatOtherButtonLater ];
You will in this case have to prepare your AppDelegate for this by creating and synthesizing that shouldHideThatOtherButtonLater-property.
I'm extremly new to iphone and I have the following misunderstanding.
All over internet the tutorials about how to use NavigationController programatically it says:
NavigationController must be declared in applicationDidFinishLaunching and must be init with a root.After that you can add views to it.
I have this:
A UIViewController class meaning(AdiViewController.h, AdiViewController.m and AdiViewController.xib) and no Delegate file meaning no applicationDidFinishLaunching method.
What I wanna do is from my class-AdiViewController when pressing a button to go to another view.
I understand that I need a NavigationController which should retain my views having the root AdiViewController.
But my problem is where should I initializate that NavigationController in viewDidAppear??...cause I don't have the Delegate files.
If you could provide a minimal example with this small issue of mine it would be great.I'm sure that for those how are senior this is nothing but still I don't get it.Thanks
NavigationController must be declared in applicationDidFinishLaunching -> this is not true.
In your AdiViewController if you have button when you push that button you want to load navigation Controller right ?
// Hook this IBAction to your button in AdiViewController
- (IBAction)pushNavController
{
AnotherViewController* rootView = [[AnotherViewController alloc] initWithNibName:#"Anotherview" bundle:nil];
UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:rootView];
[rootView release];
[self presentModalViewController:navController animated:YES];
[navController release];
}
If you are in AnotherViewController i.e., you are in root view controller of Navigation controller. You need to push and pop view controllers from there. For example if you have a button in AnotherViewController:
// push next view controller onto navigation controller's stack
- (IBAction)pushNextViewController
{
NextViewController* nextView = [[NextViewController alloc] initWithNibName:#"NextView" bundle:nil];
[self.navigationController pushViewController:nextView animated:YES];
[nextView release];
}
// Similarly if you want to go back to AnotherViewController from NextViewController you just pop that from navigation controller's stack
- (IBAction)pushNextViewController
{
[self.navigationController popViewControllerAnimated:YES];
}
I have uinavigation controller with a view controller named VC1,now i have a button in VC1 that when i click on him i go to view controller VC2,this is how i bring VC2 to screen :
VC2 *tmp = [[VC2 alloc]init];
[[self navigationController] pushViewController:tmp animated:YES];
[tmp release];
now when i click in VC2 on the back button of the navigation to return to VC1 its work but i put in VC2 viewDidDisappear and viewWillDisappear methods,and when i click on the back button this function won't called, any one have any idea?
You may call the view[..] methods manually from the UINavigationControllerDelegate callbacks, however the easiest way to ensure that the methods are called by the super implementation of the UINavigationController is just to call them manually once when the UINavigationController is allocated.
See my answer here: iPhone viewWillAppear not firing
So immediately after you have called navController = [[UINavigationController alloc] init.., make sure to call
[navController viewWillAppear:NO];
[navController viewDidAppear:NO];
[navController viewWillDisappear:NO];
[navController viewDidDisappear:NO];
This should ensure events are correctly forwarded to each view controller in the future.
If you want to call the viewWillDisappear/viewDidDisappear methods, your view controller has to do that manually before popping itself off the nav stack. Have a look at this
,you might get an idea how to do it.
I know the SDK documentation says
Taps outside of the popover’s contents automatically dismiss the popover.
But I'm sure the smart people here found a way :)
maybe I should overwrite the popover dismiss function?
Thanks
EDIT:
I tried using the passthroughViews as was suggested here, and it works perfectly. Here's the code for whoever needs it - in this example, I put self.view in the array, which means that where ever outside the button where the popover was originated, nothing dismiss the popover.
popoverController.passthroughViews = [[[NSArray alloc] initWithObjects:self.view, nil] autorelease];
You need to set the passthroughViews property. From the documentation:
An array of views that the user can interact with while the popover is visible.
#property (nonatomic, copy) NSArray *passthroughViews
When a popover is active, interactions with other views are normally disabled until the popover is dismissed. Assigning an array of views to this property allows taps outside of the popover to be handled by the corresponding views.
Set passthroughViews to an array of view(s) that you want to handle the touch event instead of just dismissing the popover.
There is a very simple and legit solution. In the view controller that presents your UIPopoverController, conform to the UIPopoverControllerDelegate protocol and implement the following delegate method. I just tested this and it does prevent popover to dismiss.
- (BOOL)popoverControllerShouldDismissPopover:(UIPopoverController *)popoverController
{
return NO;
}
Just make sure that you have set the delegate of your popover controller to the view controller that implements this.
You can dismiss the popover by using [popoverController dismissPopoverAnimated:NO]; method.
The accepted answer does not really answer the question, "is there a way NOT to have the popover dismissed when pressing outside it?", imo. It does give a possible view but could require hackish access to all parent views and determining what views are on the screen etc. The question could be rephrased as, "how do I make a popover view modal?"
You would do this like so, with a done button to close the popover:
UIViewController* vc = [[[UIViewController alloc] init] autorelease];
UIBarButtonItem* doneButton = [[[UIBarButtonItem alloc] initWithTitle:#"Done"] style:UIBarButtonItemStyleDone target:self action:#selector(processDoneAction)] autorelease];
[vc.navigationItem setLeftBarButtonItem:doneButton];
vc.modalInPopover = YES;
//If you want full screen:
vc.modalPresentationStyle = UIModalPresentationFullScreen;
vc.wantsFullScreenLayout = YES;
UINavigationController* navC = [[[UINavigationController alloc] initWithRootViewController:vc] autorelease];
UIView* view = create your view
vc.view = view;
UIPopoverController* pc = [[[UIPopoverController alloc] initWithContentViewController:navC] autorelease];
pc.delegate = self;
self.popoverController = pc;
Then you'll in your processDoneAction method you will need to dismiss the popover. Other considerations would be dismissing and redisplaying on device orientation changes, but I will leave that to another exercise as that has been answered previously on stackoverflow.
Let me first describe the context of the problem. I have 2 UIViewController call AdminViewController and ButtonReorderViewController. AdminViewController contain 1 button. ButtonReorderViewController contains 1 button and 1 picture. Button in AdminViewController tie to an event call goToReorderButton. The content of goToReorderButton are below:
ButtonReorderViewController *buttonReorder = [[ButtonReorderViewController alloc] initWithNibName:#"ButtonReorderViewController" bundle:[NSBundle mainBundle]];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:buttonReorder]; //Add a Navigation Controller to the root view
[navController setNavigationBarHidden:TRUE];
buttonReorder = (ButtonReorderViewController *) navController;
[[buttonReorder view] setFrame:CGRectMake(0, -20, 320, 470)];
[self.view addSubview:buttonReorder.view];
I use UINavigationController to allow me to swipe left and right.So I am in AdminViewController, and I click on goToReorderButton, it load ButtonReorderViewController. I am able to swipe left and right (awesome !!!) So I click the button in ButtonReorderViewController call goToAdmin, simply to go back to the AdminViewController
-(void) goToAdmin{
[self.view removeFromSuperview];
}
However, as soon as I go back to AdminViewController, I cant click anything at all. The program does not seg fault, it just that I cant click the button at all. if I remove the line buttonReorder = (ButtonReorderViewController *) navController; inside goToReorderButton, then everything work fine. Any idea how to fix this?
I'm not sure that I follow you, but I think that you should use the UINavigationController methods to navigate between the view controllers:
The admin view controller should be the root view controller of the navigation controller and then you may push and pop the reorder view controller.
In app delegate (applicationDidFinishLaunching: method):
// TODO: Instantiate the adminController
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:adminController];
[window addSubview:navController.view];
In AdminViewController (button touch up inside event handler method):
// TODO: Instantiate the buttonReorder
[self.navigationController pushViewController:buttonReorder animated:YES];
In ButtonReorderViewController (back button touch up inside event handler method):
[self.navigationController popViewControllerAnimated:YES];
Of course, you have to instantiate the view controllers before using them...
Cheers,
Michael.
Sounds like the app crashed on that line you pointed out. Does the debug console output anything when it crashes?
Looks like the line buttonReorder = (ButtonReorderViewController *) navController; is failing on the cast. Are you sure ButtonReorderViewController extends UINavigationController? If not, then you can't cast it like that.
I am not sure but i think you can use PusViewController method of NavigationController to do your job.