Add swift child view controller
I am trying to add a child view controller to a containerViewController
Child:
AViewController
BViewController
CViewController
I have no error, but when I run the application I can swipe across the screen, there are 3 sections, but view controllers A, B, C do not appear.
This is my code, any idea?
import UIKit
class ContainerViewController: UIViewController {
@IBOutlet var scrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
// creat VC
var Avc : AViewController = AViewController ()
var Bvc : BViewController = BViewController ()
var Cvc : CViewController = CViewController ()
// add it to the view hierarchie
self.addChildViewController(Cvc)
self.scrollView.addSubview(Cvc.view)
Cvc.didMoveToParentViewController(self)
self.addChildViewController(Bvc)
self.scrollView.addSubview(Bvc.view)
Bvc.didMoveToParentViewController(self)
self.addChildViewController(Avc)
self.scrollView.addSubview(Avc.view)
Avc.didMoveToParentViewController(self)
// set the frame
var adminFrame : CGRect = Avc.view.frame
adminFrame.origin.x = adminFrame.width
Bvc.view.frame = adminFrame
var BFrame : CGRect = Bvc.view.frame
BFrame.origin.x = 2*BFrame.width
Cvc.view.frame = BFrame
// set the frame of the scrollview
var scrollWidth: CGFloat = 3*self.view.frame.width
var scrollHeight: CGFloat = self.view.frame.size.height
self.scrollView.contentSize = CGSizeMake(scrollWidth, scrollHeight)
}
Edit:
Looking at the view hierarchy, it reports the following:
<UIWindow: 0x7ff3fad19f70; frame = (0 0; 320 568); gestureRecognizers = <NSArray: 0x7ff3fac3efe0>; layer = <UIWindowLayer: 0x7ff3fad19740>>
| <UIView: 0x7ff3fb108b90; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x7ff3fb108e60>>
| | <UIScrollView: 0x7ff3fac3acf0; frame = (0 0; 320 568); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x7ff3fb107320>; layer = <CALayer: 0x7ff3fac18e00>; contentOffset: {0, 0}; contentSize: {960, 568}>
| | | <UIView: 0x7ff3fac41ed0; frame = (640 0; 320 568); autoresize = W+H; layer = <CALayer: 0x7ff3fac28a00>>
| | | <UIView: 0x7ff3fac42320; frame = (320 0; 320 568); autoresize = W+H; layer = <CALayer: 0x7ff3fac38e10>>
| | | <UIView: 0x7ff3fac42730; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x7ff3fac42810>>
| | | <UIImageView: 0x7ff3faf020f0; frame = (0 564.5; 320 3.5); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x7ff3fae0df80>>
| | | <UIImageView: 0x7ff3fac1c660; frame = (316.5 0; 3.5 568); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x7ff3fac39420>>
| | <_UILayoutGuide: 0x7ff3fb108ec0; frame = (0 0; 0 20); hidden = YES; layer = <CALayer: 0x7ff3fb1091e0>>
| | <_UILayoutGuide: 0x7ff3fb109c20; frame = (0 568; 0 0); hidden = YES; layer = <CALayer: 0x7ff3fb109d00>>
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When I use your code, start the application and pause the application and look at the view hierarchy, I see this:
(lldb) po [[UIWindow keyWindow] recursiveDescription]
<UIWindow: 0x156bdc30; frame = (0 0; 320 568); gestureRecognizers = <NSArray: 0x156be750>; layer = <UIWindowLayer: 0x156aa3c0>>
| <UIView: 0x156c5440; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x156c55c0>>
| | <UIScrollView: 0x156c2740; frame = (0 0; 0 568); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x156c4d00>; layer = <CALayer: 0x156c2a80>; contentOffset: {0, 0}; contentSize: {960, 568}>
| | | <UIView: 0x156c6df0; frame = (640 0; 0 536); autoresize = W+H; layer = <CALayer: 0x156c6d80>>
| | | <UIView: 0x156c7100; frame = (320 0; 0 536); autoresize = W+H; layer = <CALayer: 0x156c70a0>>
| | | <UIView: 0x156c73f0; frame = (0 0; 0 536); autoresize = W+H; layer = <CALayer: 0x156c7390>>
| | | <UIImageView: 0x156c8bd0; frame = (0 564.5; 600 3.5); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x156c8c50>>
| | | <UIImageView: 0x156c9020; frame = (-3.5 32; 3.5 568); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x156c90a0>>
| | <_UILayoutGuide: 0x156c5620; frame = (0 0; 0 20); hidden = YES; layer = <CALayer: 0x156c5800>>
| | <_UILayoutGuide: 0x156c5c90; frame = (0 568; 0 0); hidden = YES; layer = <CALayer: 0x156c5d10>>
If you don't see your subheadings there, then the likely culprits could be:
-
You may not have specified the base view controller class in your scene, and thus this code does not run. You can confirm this with a log statement
println
or breakpoint aside of thisviewDidLoad
and make sure you hit that routine. -
You may not have connected
@IBOutlet
forscrollView
, and thusscrollView
-nil
. Confirm this by putting a breakpoint atviewDidLoad
and looking at the propertyscrollView
.
In your revised question, we can now see that three sub-points are present and appear to be correct. It's great.
Now the question is why you can't see anything. If they are defined as scenes in your storyboard, you should:
-
Make sure to have a base class and storyboard ID defined for each of these three child scenes; and
-
When your main view controller creates three child view controllers, you must create them from the storyboard using the storyboard ID (in my example, I used storyboard IDs
A
,B
andC
accordingly):let Avc = storyboard.instantiateViewControllerWithIdentifier("A") as AViewController let Bvc = storyboard.instantiateViewControllerWithIdentifier("B") as BViewController let Cvc = storyboard.instantiateViewControllerWithIdentifier("C") as CViewController
If you do the above and repeat recursiveDescription
, you will see the scene sub-items (like added shortcuts) appear in the output.
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Use the following extension to add ChildviewController create Extensions.swift file copy following code
import UIKit
extension UIViewController {
func configureChildViewController(childController: UIViewController, onView: UIView?) {
var holderView = self.view
if let onView = onView {
holderView = onView
}
addChildViewController(childController)
holderView?.addSubview(childController.view)
constrainViewEqual(holderView: holderView!, view: childController.view)
childController.didMove(toParentViewController: self)
}
func constrainViewEqual(holderView: UIView, view: UIView) {
view.translatesAutoresizingMaskIntoConstraints = false
//pin 100 points from the top of the super
let pinTop = NSLayoutConstraint(item: view, attribute: .top, relatedBy: .equal,
toItem: holderView, attribute: .top, multiplier: 1.0, constant: 0)
let pinBottom = NSLayoutConstraint(item: view, attribute: .bottom, relatedBy: .equal,
toItem: holderView, attribute: .bottom, multiplier: 1.0, constant: 0)
let pinLeft = NSLayoutConstraint(item: view, attribute: .left, relatedBy: .equal,
toItem: holderView, attribute: .left, multiplier: 1.0, constant: 0)
let pinRight = NSLayoutConstraint(item: view, attribute: .right, relatedBy: .equal,
toItem: holderView, attribute: .right, multiplier: 1.0, constant: 0)
holderView.addConstraints([pinTop, pinBottom, pinLeft, pinRight])
}
}
Custom views controller
import UIKit
class MyViewControler:UIViewControler {
@IBOutlet weak var myView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
let demoViewInstance = storyboard!.instantiateViewController(withIdentifier: "youChiledViewController_Id") as! childViewController
configureChildViewController(childController: demoViewInstance, onView: myView)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
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