I have a UIStackView and I am dynamically adding UIViewControllers contained, here is my code;
[self addChildViewController:driverForm];
[self addChildViewController:marketingView];
[self.stackView insertArrangedSubview:driverForm.view atIndex:0];
[self.stackView insertArrangedSubview:marketingView.view atIndex:1];
[driverForm didMoveToParentViewController:self];
[marketingView didMoveToParentViewController:self];
After reading the documents it states I must call didMoveToParentViewController.
The problem I am facing is, the actions on the final UIViewController are not being called, but the first ViewController does. If I swap these round the first one works and the last one does not.
Simply add the view of your ViewController to your UIStackView like this:
yourStackView.addArrangedSubview(yourViewController.view)
Also, you don't need to be worried about the view being nil as it always returns UIView!
Note that the order is reversed, so the last appears first. To address this, assuming you have an array of view controllers, you can use stride to traverse your array inversely and add view controllers to your stack.
Here is a quick copy/pasta version for Swift 5:
private var childViewController: UIViewController
private var stackView: UIStackView?
// MARK: - UIViewController
override func loadView() {
super.loadView()
// 1. Add the child view controller to the parent.
addChild(childViewController)
// 2 Create and add the stack view containing child view controller's view.
stackView = UIStackView(arrangedSubviews: [childViewController.view])
stackView!.axis = .vertical
self.view.addSubview(stackView!)
// 3. Let the child know that it's been added!
childViewController.didMove(toParent: self)
}
UIStackView is for arranging multiple subviews in the same UIViewController class. how can you use it for different UIViewControllers?
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIStackView_Class_Reference/#//apple_ref/doc/uid/TP40015256-CH1-SW31
Related
An UITableViewController pretty much takes up the entire view. I need a way to limit its height, width and add some shadows etc. For a clear explanation, I won't show the UITableViewController's contents.
Without the use of a storyboard, I subviewed the UITableViewController:
// In another UIViewController
let otherController = OtherController() // A subclass of UITableViewController
let otherControllerView = otherController.view
someView.addSubView(otherControllerView)
[...] // bunch of constraints
Notes:
In AppDelegate, if I set the rootController as OtherController(), everything works as it should. If I change it back to SomeView(), I see my modified tableView. If I should click it, it disappears.
This was the only thing that came close to my issue but sadly, I could not understand the answers provided as nothing made any sense to me.
I need to understand, why it disappears when touched etc.
view.bringSubviewToFront(...) proved futile. I'm gessing that a tableView should be rendered in its own controller and not in another view?
So just to answer this question, indeed you got two options. One is the best way, as suggested by Rakesha. Just use UITableView. Add it as a subview. Done.
And in the future, if you really want any controller to be added onto any UIView, remember you need to add that controller as a child. For example, in your case:
The controller of the view that will hold your UITableViewController will add such UITableViewController as a child.
self.addChild(yourUITableViewController)
self.whatEverViewContainer.addSubview(yourUITableViewController.view)
// Take note of the view of your tableViewController above^.
// Then setup the constraints of your yourUITableViewController.view below.
I hope this helps!
You must add the instance of UITableViewController's subclass as child view controller of the other view controller. You need to ensure few points in order to make it work. The points are as listed below:
Create the instance of your TableViewController
Add it as a child view controller of the other view controller
Add its view as a subview of the desired view (you may do these steps in viewDidLaod since they need to be done only once)
Keeping in mind the view cycle of a view controller. You must keep a weak reference of the child view controller aka TableViewController to adjust its view frame after the parent view controller has laid its subviews.
Code here:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let vc = TableViewController()
addChildViewController(vc)
view.addSubview(vc.view)
vc.didMove(toParentViewController: self)
childVC = vc
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
childVC?.view.frame = view.frame
}
I'm trying to add a sliding photo gallery functionality to the top portion of a view.
To give context, a user taps on a button or row or something. Then i load a scrollview with a uistackview in it. organized vertically, i had an image, and then another stack view with some text in it. Now, i want that image to become part of a larger "gallery". My research told me to implement UIPageviewcontroller and add the other images to a childVC.
i used this as a tutorial (the first example): http://www.raywenderlich.com/76436/use-uiscrollview-scroll-zoom-content-swift
the only relevant deviation from the tutorial my app has is that it creates things programmatically.
With my proof of concept for the gallery functionality, i wanted to integrate it with the previously mentioned stack view. my plan was to first add the pageviewcontroller stuff into the overall stack view with the original image view right below it and then simply remove the original image view to leave me the final product.
i was able to add the pageviewcontroller.view to the stackview, but the gallery doesn't show. taking a look at the UI Inspector, i can see that the gallery is kinda loaded, but it's messed up.
it's as if the uiview has a frame of 0 height and so the other stack view items don't respect the images that the pageviewcontroller is trying to show.
I think it could be that stack views can only handle specific views, not stuff as complicated as pageviewcontrollers.
also note: my implementation is all programmatic, no storyboards, and so for no xibs. so maybe i missed something here.
here is some code, if it helps:
note the constrain functions you see are from the "cartography" pod
this adds the "gallery" to the stack view, it's a delegate function from my view
func addZoomStuff(sender: UIStackView) {
let zoomer = PageBaseViewController()
addChildViewController(zoomer)
zoomer.view.translatesAutoresizingMaskIntoConstraints = false
zoomer.view.tag = 5
sender.addArrangedSubview(zoomer.view)
zoomer.didMoveToParentViewController(self)
}
this is what creates the scrollview, image view, etc for the gallery items:
override func viewDidLoad() {
super.viewDidLoad()
//MARK: - Zoom View Elements
// prep
scrollView = UIScrollView(frame: self.view.frame)
scrollView.delegate = self
self.view.addSubview(scrollView)
constrain(scrollView, view) { view, view2 in
view.edges == view2.edges
}
self.view.setNeedsUpdateConstraints()
// 1
let image = UIImage(named: imageName)!
imageView = UIImageView(image: image)
// 2
scrollView.addSubview(imageView)
constrain(imageView){ view in
view.edges == view.superview!.edges
}
scrollView.contentSize = image.size
i tried adding the constraints like this but there was no effect
func addZoomStuff(sender: UIStackView) {
let zoomer = PageBaseViewController()
addChildViewController(zoomer)
view.addSubview(zoomer.view)
constrain(zoomer.view, view) { view, view2 in
view.width == view2.width
view.height == view2.height * 2 / 3
view.leading == view2.leading
view.top == view2.top
}
zoomer.view.setNeedsUpdateConstraints()
zoomer.view.removeFromSuperview()
zoomer.view.translatesAutoresizingMaskIntoConstraints = false
zoomer.view.tag = 5
print("sender.subviews: \(sender.subviews)")
sender.addArrangedSubview(zoomer.view)
zoomer.didMoveToParentViewController(self)
print("sender.subviews: \(sender.subviews)")
}
if this method isn't going to work, can i do a nested horizontal stack view instead of the pageviewcontroller and somehow get that same scrolling/snap effect to see on image view at a time?
TLDR;
Create a subclass of UIPageViewController, make it it's own delegate.
Initialize the subclass with a plain UIViewController, only set a backgroundcolor.
In the pageviewcontroller subclass, implement the two delegate callbacks for a next and previous viewcontroller: create a plain viewcontrolller, with some random backgroundcolor.
If this works, replace the plain viewcontroller by your actual contentviewcontroller.
Long version:
Have you seen this: Maybe this link will help: https://developer.apple.com/library/ios/documentation/WindowsViews/Conceptual/ViewControllerCatalog/Chapters/PageViewControllers.html
It might help, as it explains the details of UIPageViewController. Basically, you need to create a viewController (not a view!), that shows one page of the gallery. So this VC has a stackview, and manages the content of it. The pageviewcontroller is initialized with your first contentviewController. If you create a subclass of the uipageviewcontroller, you can set self of that subclass as the delegate of it. Implement the delegate callbacks that return the next or previous viewController and thats it. For this last part, it is convenient to have a property on the contentviewcontroller from which the subclasses of the pageviewcontroller can figure out what data to set on the next or previousviewcontroller.
Your title seeks to hint at some confusion: its not possible to add a viewcontroller to a view. You can only add other views to a (stack)view. A viewcontroller owns and manages a viewhierarchy. A pageviewcontroller has no content, but manages the insertion and removal of viewcontrollers. as the pageviewcontroller is a containerviewcontroller, it will als take the contentViewcontrollers' views and place them in the viewhierarchy. But this is not something your code has to do when you subclass UIPageViewControlller and implement it's delegates on itself (and don't forget to assign self to be the delegate).
I have two ViewController.
One ViewControllers contain a UITableView. And another contains a UIButton.
I have created a SubView Programmatically.Now i want to SubView the ViewController which contains the UITableView in other when i Press UIButton.
I searched all over the net but cannot find any stable solution.
Currently i am trying this:
bodyView =[[UIView alloc]initWithFrame:CGRectMake(0,120,containerView.frame.size.width,120)];
bodyView.backgroundColor = [UIColor redColor];
CustomTableVC *tableVC = [[CustomTableVC alloc]init];
[tableVC willMoveToParentViewController:self];
[bodyView addSubview:tableVC.view];
[self addChildViewController:tableVC];
[tableVC didMoveToParentViewController:self];
[containerView addSubview:bodyView];
You cannot.
You can only use the view property of your UIViewController to assign into UIView associated in your second UIViewController which is not recommended because UIViewController as per MVC pattern holds lot controller stuff which includes populating the view and resolving the inputs/touch, which is an overhead in your (using multiple of viewcontrollers without needed) case.
You need to use one UIViewController. Add UITableView only in it, and UIButton only in it. You only use one controller and multiple views.
The other approach, if you do not want to change your code, may also use ContainerView. But in that case you need to create separate ViewControllers for UIButton and UITableView. And if you want to fetch data inbetween the ViewControllers, that will be a huge pain and also a bad software design with so much coupling and less encapsulation.
i have tried this one and it's working for me.
#IBAction func moveToOther() {
var otherController = OtherViewController()
var bodyView = UIView(frame: CGRectMake(0,120, self.view.frame.size.width, 120))
bodyView.backgroundColor = UIColor.redColor();
bodyView.layer.borderWidth = 1.0
let tblCntrl = UITableViewController()
bodyView.addSubview(tblCntrl.tableView)
bodyView.clipsToBounds = true
otherController.addChildViewController(tblCntrl)
tblCntrl.didMoveToParentViewController(otherController)
otherController.view.addSubview(bodyView)
self.navigationController?.pushViewController(otherController, animated: true)
}
You should use only one view controller that contains both the table view & UIButton.
By default hide the table view.
Just hide the button and show the table view when the button is clicked.
Calling setView on a UIViewController removes the current view from its superview automatically. I couldn't find this documented. In my case I want to dynamically swap a UIViewController object for another while maintaining my view structure. I was planning to just relink the view to the new controller but alas, that doesn't work.
In general, automatically removing the view from its superview seems like a sensible decision. The documentation should reflect this though.
(For anyone thinking it's a really bad idea to swap a view controller object in this way, let me add that the controller I'm swapping in is a subclass of the existing controller. And this method is great for adding functionality to a view that is an extension of another.)
This is how I solved it:
UIView *viewToKeep = self.viewController.view;
UIView *superview = viewToKeep.superview;
self.viewController.view = nil; // removes the view from its superview
UIViewController *swapInViewController = [[UIViewController alloc] init];
swapInViewController.view = viewToKeep;
[superview addSubview: viewToKeep];
[viewToKeep applyConstraintsToFillSuperview]; // a helper to add auto layout constraints that make the view always fill it's parent
self.viewController = swapInViewController;
Doing this is definitely going against the grain in UIKit, and therefore very likely a bad idea.
That said, here's something which prevents the view from being automatically removed, which means you don't need to use addSubview to put it back where it was.
Only tested as far as you see below, caveat emptor, etc. In Swift:
class View: UIView {
var preventRemovalFromSuperView = false
override func removeFromSuperview() {
if !preventRemovalFromSuperView {
super.removeFromSuperview()
}
preventRemovalFromSuperView = false
}
}
let vc1 = UIViewController()
let vc2 = UIViewController()
let sv = UIView()
let v = View()
// Existing hierarchy
sv.addSubview(v)
vc1.view = v
// Swap view controllers
v.preventRemovalFromSuperView = true // Prevent automatic removal
vc1.view = nil // Prevent UIViewControllerHierarchyInconsistency exception
vc2.view = v
// Check that view was not automatically removed
v.isDescendantOfView(sv) // true
I am new to programming and swift.
I have a mainViewController with a containerView which contains a scrollView. I would like to be able to pass the value of the y contentOffset from this scrollView ( from the scrollViewDidScroll(scrollView function) to update the frame.origin.y of a image in the mainViewController so that it moves inrelation to the containerView's scrollView.
How can i share data between the two View controllers (or multiple view controllers) using swift?
Any help would be greatly appreciated!!!
Suppose your scroll view is named sView and UIImageView is named img.
Then you should write something like this in your ViewController:
In class declaration add comma and scroll view delegate
class ViewController: UIViewController, UIScrollViewDelegate {
Then you should implement scrollViewDidScroll function somewhere after viewDidLoad
func scrollViewDidScroll(scrollView:UIScrollView){
if scrollView == sView {
let frame = CGRectMake(img.frame.origin.x, sView.contentOffset.y, img.frame.size.width, img.frame.size.height)
img.frame = frame
println("Just check if it's called")
}}
After that add to viewDidLoad
//You've aldeady declared sView and img
self.view.addSubview(sView)
self.sView.delegate = self
Should work then :)