In an alert view method I implemented the following (pretty standard) piece of code for popping a modal view:
else if (buttonIndex == 1) {
EmergencyPlanViewController *emergencyPlanView = [[[EmergencyPlanViewController alloc] init] autorelease];
[emergencyPlanView setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
[self presentModalViewController:emergencyPlanView animated:YES];
}
Somehow it gives me a black screen as result. I can't find what is wrong here.
I created the window in my MainStoryBoard and customized the class of the viewcontroller in IB to EmergencyPlanViewController.
The viewDidLoad method of the emergencyPlanView is triggered but it looks like the view is not loaded. Anyone an idea what's wrong here?
EDIT:
To be clear, I am not using seperate xib-files in my project. I only use the storyboard
In the xib file, is your UIView set to the File Owner's view. That is probably the problem. Also if you just apply init, that will load the EmergencyPlanViewControllerinterface builder file with the same name:
EmergencyPlanViewController.xib
So make sure in that case that either:
The EmergencyPlanViewController nib is indeed: EmergencyPlanViewController.xib
or that you write instead of init: initWithNibName://whatever nib name here
I managed to fix the black screen issue when presenting a modal view controller by setting a background color to the view in Interface Builder. I noticed that by default the background color of the view is set to something like black/white (see picture attached), although it appears in white. I don't know exactly what does this mean or how it is responsible for showing a black screen, but setting a single color or texture fixed it. PS: I've faced this when migrating from iOS SDK 5 to 6.
ios6
Try this:-
EmergencyPlanViewController *emergencyPlanView=[[EmergencyPlanViewController alloc] initWithNibName:#"EmergencyPlanViewController" bundle:nil];
emergencyPlanView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self.navigationController presentModalViewController:emergencyPlanView animated:YES];
Related
- (UIViewController *)activityViewController
I created a custom UIACtivity that returns a view controller that displays a popup. This allows the user to do some editing before performing the actual activity.
With ios below 8, my background with transparency that looks like an overlay works (I can see my game underneath) but after updating to ios8, the background becomes solid color gray. I checked the UIImageView displaying my overlay image with alpha and it is set to clear. Can someone tell me why the background suddenly becomes solid? I couldn't see the view of my game underneath anymore.
Here's my code:
- (IBAction)didPressShareButton:(id)sender
{
...
[_rootViewController presentViewController:[self getActivityViewController] animated:YES completion:nil];
...
}
The _rootViewController is the main view controller of my application.
The [self getActivityViewController] returns an instance of UIActivityViewController which includes my custom UIActivity for instagram
My InstagramUIActivity overrides this function to return a custom viewcontroller (see attached image)
- (UIViewController *)activityViewController
{
dismissalAC = [[InstagramDismissal alloc]init];
presentationAC = [[InstagramPresentation alloc]init];
instagramVC = [[InstagramViewController alloc]initWithInstagramPhoto:_instagramPhoto];
instagramVC.delegate = self;
if ([instagramVC respondsToSelector:#selector(setTransitioningDelegate:)]) {
instagramVC.transitioningDelegate = self;
}
return instagramVC;
}
dismissalAC and presentationAC are just objects that implement the UIViewControllerAnimatedTransitioning protocol so I could have my own transition animation.
When I return my custom view controller, it pops up but along with it is a view with white background. I don't know why.
try
instagramVC.modalPresentationStyle = UIModalPresentationOverFullScreen;
or
instagramVC.modalPresentationStyle = UIModalPresentationOverCurrentContext;
I encountered this problem in my apps too.
Since iOS 8, Apple forbids subclassing nor customizing the subviews of an UIActivityViewController.
If you did so on your app, the app shows an overlay over your view and an empty gray list without any buttons. In this case, you must kill your app to dismiss the UIActivityViewController.
To replace this behavior, I simply creating a view (either programmatically or from storyboard) with the same layout and you can make it appear from bottom of the screen (with an animation). Ask me some example code if needed.
I am trying to programmatically add a Navigation Controller to my View based Application. This is the code I am using (this code gets called after a button press in a view controller):
MainMenu *control = [[MainMenu alloc] initWithNibName: #"MainMenu" bundle: nil];
UINavigationController *navControl = [[UINavigationController alloc] initWithRootViewController: control];
[self.view addSubview:navControl.view];
[control release];
That works, but this ends up happening:
Notice the odd margin above the Navigation control.... My View controller that I am adding the Navigation Controller to has a gray background which you can see.
Any ideas??
If you have a better way of adding a Navigation Controller to a View based Application I am very open to suggestions!
Thank you in advance!
Thank you both for your response, but unfortunately, wantsFullScreenLayout set to YES or NO in the code didn't have any effect. I was able to push the Navigation Controller up by 20 using this line of code:
self.navigationController.navigationBar.frame = CGRectOffset(self.navigationController.navigationBar.frame, 0.0, -20.0);
but then what happened was that the View Controller did not move up with the Navigation bar and left a gap below the Navigation Bar and the View Controller. What eventually worked was checking the Wants Full Screen checkbox in IB in the MainWindow view controller that is automatically generated when you set up a view based application.
The gap you are seeing is the same height as a status bar. Check the status bar settings in your NIB file.
Chances are you want to make the UINavigationController the root view controller for the window, rather than whichever view controller you have now. That would be the better way to do it.
The reason you're seeing that extra margin at the top is because UINavigationController normally expects that it will be sized to fill the entire screen (except perhaps a tab bar at the bottom, if it's inside a UITabBarController), and therefore expects that the top edge of its view will be under the status bar if the status bar is visible. Therefore, it places its navigation bar 20 pixels below the top of its view to leave space for the status bar, without bothering to check whether its view actually is under the status bar. Interestingly, sometimes a re-layout operation will perform this check, but that's unreliable. What I've found works well in a situation like this is to set the UINavigationController's wantsFullScreenLayout property to NO. Then ti doesn't try to leave room for the status bar, so everything works as expected.
I've been struggling with this same issue this morning. Since setting the wantsFullScreenLayout property doesn't seem to have any effect, I resorted to using a little subclass, which worked fine:
#interface MyNavigationController : UINavigationController
#end
#implementation MyNavigationController
- (BOOL)wantsFullScreenLayout;
{
return NO;
}
#end
Its so simple to remove that gap..
self.navigationBar.view.frame = CGRectMake(0, -20, 320, 480);
i got a little problem, when launching my splitview in landscape, there is a little black space above my left view controller:
after rotating my ipad to portrait and switching back to landscape, the space is gone.
if i load the uitableviewcontroller directly into the left view, and not in a navigationcontroller, it works fine:
any ideas why this is happening ??
// Produkte
self.produkteMainTableVC = [[produkteMainTableViewController alloc] initWithStyle:UITableViewStylePlain];
UINavigationController *produkteMainNavigationController = [[UINavigationController alloc] initWithRootViewController:self.produkteMainTableVC];
self.produkteDetailVC = [[produkteDetailViewController alloc] initWithNibName:#"produkteDetailViewController" bundle:nil];
self.produkteSplitVC = [[UISplitViewController alloc] init];
self.produkteSplitVC.delegate = self.produkteDetailVC;
self.produkteMainTableVC.produkteDetailVC = produkteDetailVC;
[self.produkteSplitVC setViewControllers:[NSArray arrayWithObjects:produkteMainNavigationController,self.produkteDetailVC,nil]];
thanks for all help!
edit:
its exactly 20px like the statusbar. does that help anyone?
edit2:
doing something like this:
if(self.navigationController.navigationBar.frame.origin.y >= 20.0) {
self.navigationController.navigationBar.frame = CGRectMake(self.navigationController.navigationBar.frame.origin.x, 0.0, self.navigationController.navigationBar.frame.size.width, self.navigationController.navigationBar.frame.size.height);
}
results that:
a little improvement i would say. but i have no idea how to stick my tableview underneath the navigationbar.
I know this is a very old topic but maybe it'll help other people...
I had the same issue (with the same configuration : splitview in tabbar).
This property solved it !
[self.splitViewController setWantsFullScreenLayout:YES];
UINavigationController has a nasty habit of shifting its contents down by 20px, depending where you place it. I'm guessing it's doing it here because your split view controller is inside of a tabbar controller, and Apple has not blessed this type of arrangement.
I've run into this same issue, with out a resolution. The only thing I've noticed is this does NOT happen when the master does not include a UINavigationController as its root.
Anyone figure a solution to this?
Here's what I did, and it seems to work fine.
I created my own custom tab-view controller, derived from UIViewController. In viewDidLoad I add a UITabBar to the bottom of the view and set the delegate to myself so I can handle tab changes. (I return this UITabBar as the rotatingFooterView) Tab changes result in swapping the current view controller, just like a real UITabBarController. When swapping view controllers (sometimes a UISplitViewController, hosting a UINavigationController in the master view), I add and position the view-controller's view within my view, above the UITabBar. I'm also careful to forward viewWill/DidAppear/Disappear calls to the current view controller, as well as each of the will/didRotate messages.
seems that this problem occurs from iOS 7.0. Setting the frame of UINavigationBar in some cases doesn't work. I think this can solve your problem :
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {
self.navigationController.view.frame = CGRectMake(0, -20, self.navigationController.view.frame.size.width,
self.navigationController.view.frame.size.height);
}
This code should be called only once (for example in - (void)viewDidLoad ).
In my case it works for all device orientation.
Just because I am unable to find a secure way (in a sense that it can be rejected by Apple guys) to customize UITabbar, in particular UITabBarItem I am trying some workaround.
I have a main view on which I recreate a kind of UITabBar, a normal view with two buttons inside. This is (roughly) the current hierarchy:
-MainView
--placeholder(UIView)
--fakeTab (UIView)
What I want to do is, after tapping a button in fakeTab, build a UINavigationController and add it to "placeholder" view so that the fakeTab remain on top and the whole navigation happens on the placeholder level.
I already tried with this piece of code in the method that it's intercepting tap button, and it works, I can see the ipvc.view added to placeholder.
IPPlantsViewController *ipvc = [[IPPlantsViewController alloc] initWithNibName:#"IPPlantsView" bundle:[NSBundle mainBundle]];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:ipvc];
UIView *placeholder = [self.view viewWithTag:200];
[placeholder addSubview:ipvc.view];
But later when I call from inside ipvc, then nothing happens:
IPAttributes *ipas = [[IPFactory findPlantByIndex:indexPath.row] attrs];
[self.navigationController pushViewController:ipa animated:YES];
I find the solution myself. What I was doing wrong is to attach the ipvc controller view to placeholder. Instead of doing this:
[placeholder addSubview:nav.view];
and everything works as expected, with my fake tabbar fully customized :-)
But, as a side note, the viewWillAppear seems to be never called.
It would be interesting to know why. I partially solved by making IPPlantsViewController the delegate of the UINavigationController.
I am trying to create a reusable "picker". It is basically like a keypad of a phone. Since I will be using this a lot in my iPhone app, I have been frustrated with trying to make it appear.
It is in its own XIB file and has its own UIViewController subclass as the FileOwner.
However, when I instantiate this with:
MonthPickerViewController *mpvc
= [[MonthPickerViewController alloc] initWithNibName:#"MonthPicker"
bundle:nil];
Nothing happens on the screen. Yet is does fire the -viewWillAppear methods, etc.
So, what am I doing wrong either in code or in InterfaceBuilder that is preventing my view to appear?
Are you pushing the view controller?
[[self navigationController] pushViewController:mpvc animated:YES];
Or are you adding the view controller's view as a subView of your current view?
First, make sure you've hooked everything up right inside Interface Builder. An easy gotcha is to forget to connect the View object up to the view outlet of your UIViewController subclass.
Then, as Adam says, you need to actually display the view. Assuming you're doing this inside the code of another view controller, you'd need something like the following if you just wanted the new view to appear ontop of your current view:
[self.view addSubview:mpvc.view];
Of if you are using a navigation controller to stack views:-
[[self navigationController] pushViewController:mpvc animated:YES];