I have 2 views, ParentViewController and ChildViewController; I want to nest ChildViewController inside ParentViewController. I have designed ParentViewController and ChildViewController in Storyboard. ParentViewController.m contains the logic for the parent and ChildViewController.m contains the logic for the child. In ParentViewController.m I add the child like so:
ChildViewController *childVC = [self.storyboard instantiateViewControllerWithIdentifier:#"ChildSBI"];
[self addChildViewController:childVC];
My Question: How can I position childVC within ParentViewController (i.e. set it's origin).
It seems like I want to do something like the following:
Alloc init child
Call (void)addSubview:(UIView *)view on the view of the child
How can I position childVC within ParentViewController (i.e. set it's origin).
Remember that a view controller doesn't have an origin -- only its view does. To make a view controller's content appear on screen, you need a view to draw it in. You can have one view controller's view appear in another view controller's view hierarchy, and it's quite easy to do with storyboards.
To set up a parent/child relationship between view controllers in a storyboard, do the following:
Add a container view to the parent view controller's view hierarchy.
Drag an "embed" segue from that container view to the child view controller.
You can use the usual -prepareForSegue:sender: method to let the parent controller pass data to the child.
You can also set things up programmatically, if you prefer, and the code you've got is a good start:
ChildViewController *childVC = [self.storyboard instantiateViewControllerWithIdentifier:#"ChildSBI"];
[self addChildViewController:childVC];
After that, your parent view controller should set the child's view's position and add it to the parent's view, like this:
UIView *childView = childVC.view;
childView.frame = CGRectMake(150, 300, 100, 100); //use whatever coordinates you want
[self.view addSubview:childView];
There's a lot more detail in Creating Custom Container Controllers, but the basic answer to your question is that the container controller should set the size and position of the contained controller's view.
Related
I added child view controller to parent view controller programmatically in swift 3.0.
But I do not want the child view controller width as full screen, I want to customise the width and height of the child view controller. I tried to open the custom size child view controller, but it is not working.
// Here is my code
let secondViewController = storyboard.instantiateViewController(withIdentifier: storyBoardName)
secondViewController.modalPresentationStyle = UIModalPresentationStyle.custom
secondViewController.view.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width-500, height: self.view.bounds.height)
self.present(secondViewController, animated: false, completion: nil)
Is there a way to achieve this?
In your code, you are not adding the secondViewController as childview controller. You are presenting that view controller. There is a difference.
You are trying to use UIModalPresentationStyle.custom to present viewcontroller using custom style. But using this custom style is not this trivial.
From documentation:
Creating a custom style involves
subclassing UIPresentationController and using its methods to animate
any custom view onto the screen and to set the size and position of
the presented view controller. The presentation controller also
handles any adaptations that occur because of changes to the presented
view controller’s traits
It tells you that you need to subclass UIPresentationController and subclass its method(with other methods) - (CGRect)frameOfPresentedViewInContainerView to set the frame of the presented viewcontroller.
More is explained in this link.
You can ofcourse achieve all this by actually adding a childviewcontroller.
Steps would be like this:
Create your child viewcontroller instance.
Set its view frame to whatever you want.
Add its view as a subview on to parent view controller's view using addSubview:
Call [addChildViewController] on parent viewcontrller (https://developer.apple.com/documentation/uikit/uiviewcontroller/1621394-addchildviewcontroller)
It depends on what you're trying to do, when I want to show some UI on top of another UIViewController I usually use a fullscreen view controller with self.modalPresentationStyle = .overFullScreen. Then I create another view which has the visible size I actually want to show to the user. This allows you to do pretty much anything you want.
But if you want an actual child viewcontroller, you need to use the appropriate functions for it.
Let's say that on the tap of a UIButton in ViewControllerA the following happens before transitioning to ViewControllerB:
- (IBAction)levelSelectButton:(id)sender {
ViewControllerB* obj = [[ViewControllerB alloc] init];
[self addChildViewController:obj];
CGSize screenSize = [MainScreen screen];
CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;
obj.view.frame = CGRectMake(0,0,screenWidth,screenHeight);
[obj.view addSubview:_banner];
//[obj didMoveToParentViewController:self];
[self runPushAnimationWithController:obj];
}
When ViewControllerB shows up, I can see my _banner (a GADBannerView object) view in place, but when I return to ViewControllerA it is no longer there.
I have never used addChildViewController:/didMoveToParentViewController: methods before so I don't know if this is expected, but I want to be able to return to ViewControllerA with _banner still visible.
Do I need to retain it?
A view can only belong to a single superview. To quote Apple's docs:
Views can have only one superview. If view already has a superview and
that view is not the receiver, this method removes the previous
superview before making the receiver its new superview.
So when you add your view to a newly created parent view controller, it gets removed from the current view controller's view hierarchy.
I would advise against doing this sort of thing. Just create a copy of the view in both places. If it uses large amounts of data, share the data (model) between view controllers, but not the view objects.
If you are completely set on moving your view around between view controllers, I would add a property to the new view controller and set that property rather than manipulating the other view controller's view hierarchy. You'll also have to pass the view BACK when you return to your current view controller.
You should treat a view controller's view hierarchy as private. Not doing that violates the principle of encapsulation.
I have a container view controller that consists of a navigation view at top, and a content view for the remainder of the screen. The navigation menu consists of several buttons, some of which present a popover with UITableView for secondary navigation. This all worked until I assigned a child view controller and set it's view as subview of the content view. Now, the popover appears, but has nothing inside it (no tableview, just black).
Why is this?
Here's the code I added for the child vc in container view:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
ContentWebViewController *initialVC = [[ContentWebViewController alloc] init];
[self addChildViewController:initialVC];
initialVC.view.frame = self.view.bounds;
[self.containerView addSubview:initialVC.view];
self.currentController = initial;
}
See the screenshot below. I added a vc with a simple webview showing google (just as a placeholder for now). The popover was working fine before I assigned the child VC.
Maybe it will help other in other cases -
If you are using size classes (probably you are since you are developing this to iPad) -
Design your popover view controller in Any-Any size and it should be OK - after that you can return to your wanted size.
(You can also uninstall the size classes of any object in that view controller instead of redesign the VC)
I somehow (don't ask me how) changed the class that my table view controller was inheriting from. It should have been (obviously) UITableViewController, but was UITableViewController, so initWithStyle was not being called....
I am trying out an application using a child ViewController inside another viewController.
I have a VC and I am instantiating another VC with its own xib inside the outer VC.
I am adding it as a child using the new iOS 5 method addChildViewController and also I have added its view as a subView.
But how do I control its position and size inside the parent view controller ?
should I modify the frame of the child controller's view ?
or I have to adjust the freeform view in the xib itself ?
Also in my current implementation, the child view starts behind the status bar of the parent viewcontroller's view.
Any idea on how to systematically implemement something like this ?
#define SUBVIEWS_FRAME CGRectMake(0,20,100,100) // whatever frame you need
- (void)addChildViewController:(UIViewController *)childController{
[childController.view setFrame:SUBVIEWS_FRAME];
[super addChildViewController:childController];
}
Simply just add a view in parentViewController #synthesize that view like childView. now add your childViewController as a subView in childView of parentViewController. it will simple to adjust using parentViewController View on nib file. If you have a large childViewController then please use UIScrollView instad of UIView
I have a navigation controller that controls view switch. How can I show a view without removing the current view?
if your new view has a view controller use
[self.navigationController presentModalViewController:newController animated:YES];
This will add a view to the viewcontrollers view.
[parentView addSubview:subView];
This will add the view in variable subView into the view in variable parentView. In your case this would mean parentView is the viewcontroller's view and the subView is the view you want to add.
You can change the position of the subView in the parentView by setting the subview's subview.frame property.
If you are talking about a viewController you want to show take a look at the answer of Andiih.