Highest scored 'iphone+uiviewcontroller' questions

168 votes

12 answers

147k views

Given a view, how do I get its viewController?

I have a pointer to a UIView. How do I access its UIViewController? [self superview] is another UIView, but not the UIViewController, right?

mahboudz

39.3k

asked Sep 3, 2009 at 11:55

156 votes

16 answers

94k views

Display clearColor UIViewController over UIViewController

I have a UIViewController view as a subview/modal on top of another UIViewController view, such as that the subview/modal should be transparent and whatever components is added to the subview should ...

hightech

3,762

asked Jun 27, 2012 at 23:56

142 votes

6 answers

83k views

Animate change of view controllers without using navigation controller stack, subviews or modal controllers?

NavigationControllers have ViewController stacks to manage, and limited animation transitions. Adding a view controller as a sub-view to an existing view controller requires passing events to the sub-...

TigerCoding

8,710

asked Nov 16, 2011 at 3:18

138 votes

13 answers

94k views

viewWillDisappear: Determine whether view controller is being popped or is showing a sub-view controller

I'm struggling to find a good solution to this problem. In a view controller's -viewWillDisappear: method, I need to find a way to determine whether it is because a view controller is being pushed ...

Michael Waterfall

20.5k

asked Nov 29, 2009 at 20:09

137 votes

20 answers

205k views

Get the current displaying UIViewController on the screen in AppDelegate.m

The current UIViewController on the screen need to response to push-notifications from APNs, by setting some badge views. But how could I get the UIViewController in methodapplication:...

lu yuan

7,217

asked Jul 24, 2012 at 19:09

127 votes

14 answers

166k views

Dismissing a Presented View Controller

I have a theoretic question. Now İ'm reading Apple's ViewController guide. They wrote: When it comes time to dismiss a presented view controller, the preferred approach is to let the presenting ...

nikitahils

1,402

asked Jan 31, 2013 at 23:14

122 votes

5 answers

121k views

Storyboard - refer to ViewController in AppDelegate

consider the following scenario: I have a storyboard-based app. I add a ViewController object to the storyboard, add the class files for this ViewController into the project and specify the name of ...

Matthias D

1,591

asked Nov 18, 2011 at 17:24

115 votes

16 answers

164k views

Removing viewcontrollers from navigation stack

I have a navigation stack, with say 5 UIViewControllers. I want to remove the 3rd and 4th viewcontrollers in the stack on the click of a button in the 5th viewcontroller. Is it possible to do this? If ...

Jean Paul

2,419

asked Apr 23, 2012 at 13:30

110 votes

12 answers

137k views

presentViewController and displaying navigation bar

I have a view controller hierarchy and the top-most controller is displayed as a modal and would like to know how to display the navigation bar when using 'UIViewController:presentViewController:...

Jonas Gardner

2,468

asked Mar 15, 2012 at 16:41

83 votes

4 answers

34k views

dismissModalViewController AND pass data back

I have two view controllers, firstViewController and secondViewController. I am using this code to switch to my secondViewController (I am also passing a string to it): secondViewController *second = ...

Andrew Davis

2,320

asked Jun 1, 2011 at 15:34

80 votes

21 answers

93k views

How to use presentModalViewController to create a transparent view

I am displaying a modal view with [self presentModalViewController:controller animated:YES]; When the view moves up the screen it is transparent as per the setting in the xib file it is created from,...

Darryl Braaten

5,225

asked Feb 25, 2009 at 20:20

75 votes

8 answers

112k views

Display UIViewController as Popup in iPhone

Since there is no complete, definitive answer to this common recurring question, I'll ask and answer it here. Often we need to present a UIViewController such that it doesn't cover full screen, as in ...

CRDave

9,289

asked Apr 26, 2013 at 7:13

74 votes

8 answers

120k views

How to add an UIViewController's view as subview

Note to googlers, this Q-A is now six years out of date! As Micky below and others mention, this is now done on an everyday basis with Containers in iOS. I have a ViewController which controls many ...

sperumal

749

asked Sep 28, 2009 at 12:47

70 votes

10 answers

23k views

CAGradientLayer, not resizing nicely, tearing on rotation

I'm trying to get my CAGradientLayers, that i'm using to create nice gradient backgrounds, to resize nicely on rotation and modal view presentation, but they will not play ball. Here is a video I ...

Woodstock

22.5k

asked Jul 9, 2013 at 18:53

68 votes

14 answers

70k views

How to allow only single UIViewController to rotate in both Landscape and Portrait direction?

My app is only for iphone device (both iphone 4 and 5) and built to support only ios 6. My whole app only supports portrait mode. But there is one view called "ChatView" , which i want to support ...

Rohan

2,939

asked Jul 4, 2013 at 8:57

67 votes

15 answers

46k views

Checking if a UIViewController is about to get Popped from a navigation stack?

I need to know when my view controller is about to get popped from a nav stack so I can perform an action. I can't use -viewWillDisappear, because that gets called when the view controller is moved ...

Jasarien

58.4k

asked Mar 13, 2009 at 11:46

64 votes

9 answers

82k views

Pass data back to previous viewcontroller

I am trying to pass data BACK TO previous viewController. Does anyone know how to pass data back from ViewController B to ViewController A? So I want a string to go 'from' ...

Anthony

889

asked Oct 13, 2013 at 9:07

63 votes

3 answers

57k views

iPhone how to check the type of an Object?

I want to check the type of an Object. How can I do that? The scenario is I'm getting an object. If that object is of type A then do some operations. If it is of type B then do some operations. ...

g.revolution

12.1k

asked Sep 2, 2009 at 14:42

62 votes

4 answers

65k views

How to force layoutSubviews of UIView?

I have a custom UIView which has a dedicated, manually set frame for portrait and landscape orientation because autoresizingMasks just don't work in my case. I set this frame in: - (void)...

myell0w

2,210

asked Sep 27, 2011 at 14:03

60 votes

6 answers

35k views

How to press "Back" button in UINavigationController programmatically

I have a UIViewController called FriendsViewController inside a UINavigationController. And a second UIViewController called FriendsDetailedViewController. When navigating from the first view ...

Timur Mustafaev

4,919

asked Oct 4, 2011 at 9:48

58 votes

4 answers

23k views

Do I have to call addSubview after calling addChildViewController?

I'm trying to create a container view controller using iOS5 and new methods like addChildViewController. Do I have to call addSubview after calling addChildViewController? Do I have to call ...

Ricardo

2,891

asked Apr 13, 2012 at 15:36

57 votes

7 answers

26k views

What is the process of a UIViewController birth (which method follows which)?

There are many methods to override, like initWithNibname:, awakeFromNib, loadView, viewDidLoad, viewDidAppear:, layoutSubviews, and I just cannot decide in which order gets these method called. I ...

Geri Borbás

16.2k

asked Feb 24, 2011 at 16:38

55 votes

6 answers

71k views

Custom Animation for Pushing a UIViewController

I want to show a custom animation when pushing a view controller: I would like to achieve something like an "expand" animation, that means the new view expands from a given rectangle, lets say [100,...

Erik

12k

asked Sep 10, 2009 at 15:36

52 votes

4 answers

81k views

View Controllers: How to switch between views programmatically?

In short: I want to have two fullscreen views, where I can switch between view A and view B. I know I could just use an Tab Bar Controller, but I dont want to. I want to see how this is done by hand, ...

Thanks

40.3k

asked May 26, 2009 at 14:30

51 votes

4 answers

62k views

When should I initialize a view controller using initWithNibName?

When should I use init: and when should I use initWithNibName:bundle: when creating a view controller?

Anthony Glyadchenko

3,602

asked Feb 8, 2010 at 18:57

51 votes

14 answers

52k views

"Pushing the same view controller instance more than once is not supported" exception

I am using the following code to retrieve some messages and putting them into my inbox. MyInboxVC *inboxVC=[MyInboxVC get ]; //upload all the pending messages UINavigationController *...

Suchi

10k

asked Aug 16, 2011 at 18:27

50 votes

9 answers

65k views

Xcode/iOS5: Move UIView up, when keyboard appears

I'd like to move up my view, when the keyboard is shown. The keyboard (height: 216) should push up my view with it's height. Is this possible with a simple code?

filou

1,609

asked Oct 31, 2011 at 10:59

47 votes

22 answers

51k views

iPhone - dismiss multiple ViewControllers

I have a long View Controllers hierarchy; in the first View Controller I use this code: SecondViewController *svc = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil]...

Oscar Peli

1,108

asked May 31, 2010 at 14:37

47 votes

4 answers

13k views

In iOS 9, why is SFSafariViewController is being pushed instead of presented modally?

I'm presenting a SFSafariViewController by calling presentViewController:animated:completion: on a UIViewController instance. The result is that it gets pushed on (slides in from the right), as if ...

abc123

8,203

asked Feb 25, 2016 at 13:45

45 votes

15 answers

25k views

How to Dismiss 2 Modal View Controllers in Succession?

I have 2 view controllers presented modally. A presents B which presents C. When I dismiss C I would like to dismiss B as well. But I am not sure how to do this: Dismiss C: [self ...

Sheehan Alam

60.5k

asked Jul 11, 2010 at 19:20

45 votes

5 answers

32k views

When is UIViewController viewDidUnload called?

Note: This question is outdated—viewDidUnload is deprecated iOS 6. When does UIViewController's viewDidUnload automatically get called? Yes I know, when the view unloads. But when does that happen ...

mk12

26.1k

asked Aug 17, 2009 at 2:27

43 votes

2 answers

38k views

Use of background/foreground methods in AppDelegate

I'm planning to implement multi-task in my app. I can see many methods here to do that in the AppDelegate like applicationWillResignActive, applicationDidEnterBackground, ...

Oliver

23.3k

asked Jan 31, 2011 at 1:13

42 votes

11 answers

67k views

How to get the previous viewcontroller that pushed my current view

The home page of my app has UIButtons, btnIncome and btnExpense. Pressing on this buttons pushes IncomeVC and ExpenseVC respectevely,which are two UIViewControllers with UITabBar added via xib. The ...

Midas

930

asked May 17, 2013 at 12:03

40 votes

3 answers

35k views

Add toolbar to UITableViewController

What is the simplest way to add UIToolBar to UITableViewController? I'm depending on edit functionality, so I can't change UITableViewController to UIViewController easily.

Farcaller

3,070

asked Sep 29, 2009 at 14:19

38 votes

6 answers

9k views

UILabel updating stops during scrolling UIScrollView

I have a scrollView with an imageView inside of it. The scrollView is a subView of the superView, and the imageView is a subView of the scrollView. I also have a label (at the super-view level) that ...

brainondev

1,117

asked Mar 21, 2011 at 13:00

37 votes

5 answers

47k views

Order of UIViewController initialization and loading

I'm fairly new to UI programming on the Mac and iPhone, and I've run across something that somewhat puzzles me. A UIViewController has 3 methods that involve the initialization of it and its view: ...

Dani

708

asked Jan 13, 2010 at 0:21

35 votes

5 answers

33k views

Easiest way to support multiple orientations? How do I load a custom NIB when the application is in Landscape?

I have an application in which I would like to support multiple orientations. I have two .xib files that I want to use, myViewController.xib and myViewControllerLandscape.xib. myViewController.xib ...

Peter Hajas

4,001

asked Mar 22, 2010 at 23:43

34 votes

11 answers

69k views

UIViewController -viewDidLoad not being called

Being new to Cocoa, I'm having a few issues with Interface Builder, UIViewController and friends. I have a UIViewController subclass with a UIView defined in a xib, and with the controller's view ...

Justicle

15k

asked May 27, 2009 at 2:03

34 votes

1 answer

48k views

When to use addChildViewController vs pushViewController

I just watched a 2011 WWDC presentation on "Implementing UIViewController Containment" (here's a link to the video) They mentioned both of these ways of adding viewControllers to the screen, and I ...

RanLearns

4,126

asked Nov 10, 2011 at 17:55

33 votes

7 answers

30k views

Proper way to hide status bar on iOS, with animation and resizing root view

Consider a view controller that needs to slide out (or hide) the status bar when a button is clicked. - (void) buttonClick:(id)sender { [[UIApplication sharedApplication] setStatusBarHidden:YES ...

hpique

120k

asked Nov 29, 2012 at 11:23

33 votes

9 answers

25k views

How to maintain presenting view controller's orientation when dismissing modal view controller?

I have this app I am working on and I need ALL my view controllers but one to be in portrait. The single one view controller that is special I need it to be able to rotate to whatever orientation the ...

Mihai Fratu

7,635

asked Jun 15, 2014 at 12:40

32 votes

1 answer

9k views

Am I abusing UIViewController Subclassing?

In trying to figure out why viewWillAppear wasn't being called in my app I came across what may be a gross misunderstanding I hold about the intended use of UIViewController subclasses. According to ...

averydev

5,737

asked Apr 17, 2011 at 3:25

31 votes

16 answers

28k views

iPhone crashing when presenting modal view controller

I'm trying to display a modal view straight after another view has been presented modally (the second is a loading view that appears). - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:...

Michael Waterfall

20.5k

asked Sep 11, 2009 at 16:38

30 votes

5 answers

28k views

Why is my NSNotification its observer called multiple times?

Within an App I make use of several viewcontrollers. On one viewcontroller an observer is initialized as follows: [[NSNotificationCenter defaultCenter] removeObserver:self name:@"MyNotification" ...

BarryK88

1,806

asked Nov 6, 2013 at 0:11

30 votes

13 answers

40k views

How to identify that an UIViewController is presented

I have created an UIViewController sub class which can either be pushed in a navigation stack of a UINavigationController or presented(modally) from any UIViewController. I need to identify whether my ...

saikamesh

4,609

asked Feb 26, 2013 at 13:58

30 votes

3 answers

27k views

UIView vs UIViewController

Ok so i am realllly new to the iphone development and i've gotten pretty far for my knowledge. I just need help deciding how to program these 4-6 pictures into my project. I basically want to make a ...

Dane

365

asked Jul 20, 2009 at 1:40

30 votes

2 answers

20k views

Embed UIViewController Programmatically?

I have a Storyboard setup with a UIViewController with an container view so that I can embed another UIViewController inside of it. In a certain scenario I need to change the embedded view controller....

Josh Kahane

17k

asked Aug 23, 2015 at 11:48

29 votes

3 answers

16k views

Handling app delegates and switching between views

I'm getting a warning about a semantic issue pertaining to passing a *const _strong to type id and cannot seem to fix it no matter what I change. I have two views at the moment, and have written this ...

Chris

12k

asked Jun 15, 2011 at 21:58

29 votes

7 answers

59k views

Touch events on UITableView?

I have UIViewControllerand UITableView as child in the view, what I want to do is when I touch any row I am displaying a view at bottom. I want to hide that view if the user touch any where else then ...

Kapil Choubisa

5,212

asked May 1, 2011 at 12:04

29 votes

5 answers

15k views

How do I override the "view" property in UIViewController?

I have a custom UIViewController and custom UIView. I'd like to override the viewcontroller.view property to return MyCustomUIView. Right now I have: @interface MyViewController : UIViewController ...

Keith Fitzgerald

5,691

asked Mar 14, 2009 at 19:13

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