I have a UIViewController called Container, that houses two other child UIViewControllers: Master and Detail.
My problem is trying to access the Container from one of its child controllers.
App Delegate Code:
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var container: Container?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
window = UIWindow(frame: UIScreen.mainScreen().bounds)
container = Container(nibName: "Container", bundle: nil)
window?.rootViewController = Container()
window?.makeKeyAndVisible()
return true
}
func appShowDetailView(vc:UIViewController){
container!.showDetailView(vc)
}
}
Container Code:
import UIKit
class Container: UIViewController {
var masterView:UIViewController?
var detailView:UIViewController?
var masterViewFrame = CGRectMake(0, 0, 0, 0)
var detailViewFrame = CGRectMake(0, 0, 0, 0)
var detailOnScreenFrame = CGRectMake(0, 0, 0, 0)
var detailOffScreenFrame = CGRectMake(0, 0, 0, 0)
var masterViewHeight:CGFloat = 50
override func viewDidLoad() {
super.viewDidLoad()
masterView = MenuViewController(nibName: "MenuViewController", bundle: nil)
detailView = RootViewController(nibName: "RootViewController", bundle: nil)
masterViewFrame = CGRectMake(0, 0, self.view.frame.width, masterViewHeight)
detailViewFrame = CGRectMake(0, masterViewHeight, self.view.frame.width, self.view.frame.height - masterViewHeight)
detailOffScreenFrame = CGRectMake(detailViewFrame.origin.x, detailViewFrame.origin.y + detailViewFrame.height, detailViewFrame.width, detailViewFrame.height)
detailOnScreenFrame = detailViewFrame
self.addChildViewController(masterView!)
self.addChildViewController(detailView!)
masterView!.view.frame = masterViewFrame
detailView!.view.frame = detailViewFrame
self.view.addSubview(masterView!.view)
self.view.addSubview(detailView!.view)
}
func cycleDetailView(from:UIViewController, toView to:UIViewController){
from.willMoveToParentViewController(nil)
self.addChildViewController(to)
to.view.frame = self.detailOffScreenFrame
self.detailView = to
self.transitionFromViewController(from, toViewController: to, duration: 0.25, options: UIViewAnimationOptions.allZeros,
animations: {() -> Void in
// send the new view controller in, and the old one out
to.view.frame = self.detailOnScreenFrame
from.view.frame = self.detailOffScreenFrame
}, completion: {success -> Void in
// tells the view controllers cycling has ended
from.removeFromParentViewController()
to.didMoveToParentViewController(self)
}
)
}
func showDetailView(vc: UIViewController){
if let oldView = detailView {
cycleDetailView(oldView, toView: vc)
}else{
detailView = self.childViewControllers[1] as? UIViewController
if let oldView = detailView {
cycleDetailView(oldView, toView: vc)
}else{
}
}
}
}
The problem lies in showDetailView(). When this is called by a piece of code like this:
let appDelegate = UIApplication.sharedApplication().delegate as? AppDelegate
if let delegateUnwrapped = appDelegate {
delegateUnwrapped.appShowDetailView(aViewController)
}
...the Container function showDetailView() can only get nil values for detailView and self.childViewControllers is an empty array.
This make me think I am accessing the child view controller in the wrong way.
Can anyone tell me where I am going wrong?
TIA.
