Present Popover View Controller Swift - ios

Question

When I try to display a popover view controller programmatically it won't work and I don't know why. I've copied from multiple sources on the web and nothing seems to work, I get the same error in the console every time showing Warning: Attempt to present <AddFriendsPopoverViewController> on <MainPageViewController> whose view is not in the window hierarchy! I am lost and can't seem to figure out what the problem is, thanks in advance!
Here is my swift code in my viewDidLoad() function:
let addFriendsPopoverViewController = AddFriendsPopoverViewController()
override func viewDidLoad() {
super.viewDidLoad()
if (PFUser.currentUser()?["numberOfFriends"])! as! NSObject == 0 {
print(PFUser.currentUser()?["numberOfFriends"])
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("AddFriendsPopoverViewController") as! UIViewController
vc.modalPresentationStyle = UIModalPresentationStyle.Popover
vc.preferredContentSize = CGSizeMake(50, 50)
let popoverMenuViewController = vc.popoverPresentationController
popoverMenuViewController!.permittedArrowDirections = .Any
popoverMenuViewController!.delegate = self
popoverMenuViewController!.sourceView = self.view
popoverMenuViewController!.sourceRect = CGRectMake(
100,
100,
0,
0)
self.presentViewController(vc, animated: true, completion: nil)
}
}
EDIT
I figured out that for a popover to work with iPhone the following code is required.
func adaptivePresentationStyleForPresentationController(controller: UIPresentationController!) -> UIModalPresentationStyle {
// Return no adaptive presentation style, use default presentation behaviour
return .None
}

Answer 1

Your view is not in the view hierarchy until it has been presented and not during viewDidLoad:
Move your code to viewDidAppear:
if (PFUser.currentUser()?["numberOfFriends"])! as! NSObject == 0 {
addFriendsPopoverViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
addFriendsPopoverViewController.preferredContentSize = CGSizeMake(200, 200)
let popoverMenuViewController = addFriendsPopoverViewController.popoverPresentationController
popoverMenuViewController!.permittedArrowDirections = .Any
popoverMenuViewController!.delegate = self
popoverMenuViewController!.sourceView = self.view
popoverMenuViewController!.sourceRect = CGRect(
x: 50,
y: 50,
width: 1,
height: 1)
presentViewController(
addFriendsPopoverViewController,
animated: true,
completion: nil)
}

Answer 2

Your code is working right but u can not write that presentViewController code in ViewDidLoad method because viewdidLoad call till that time controller itself it not presented thats why it's not allow to presentViewController .
Write that same code in..
override func viewDidAppear(animated: Bool)
{
var controller = UIViewController()
controller.view.backgroundColor = UIColor .greenColor()
presentViewController(controller, animated: true, completion: nil)
}

Answer 3

I have made it simple for multiple use and its ready to use and go. just copy and paste this extension.
extension UIViewController: UIPopoverPresentationControllerDelegate{
#discardableResult func presentPopOver(_ vcIdentifier: String, _ isAnimate: Bool = true,sender:UIView,contentSize:CGSize = .init(width: 100, height: 100)) -> (UIViewController){
let popoverContentController = storyboard?.instantiateViewController(withIdentifier: vcIdentifier)
popoverContentController?.modalPresentationStyle = .popover
if let popoverPresentationController = popoverContentController?.popoverPresentationController {
popoverPresentationController.permittedArrowDirections = .up
popoverPresentationController.sourceView = sender
popoverPresentationController.sourceRect = sender.bounds
popoverContentController?.preferredContentSize = contentSize
popoverPresentationController.delegate = self
if let popoverController = popoverContentController {
present(popoverController, animated: isAnimate, completion: nil)
}
}
return popoverContentController ?? UIViewController()
}
public func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
return .none
}
public func popoverPresentationControllerDidDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) {
}
public func popoverPresentationControllerShouldDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) -> Bool{
return true
}}
**how to use for presenting pop over on button click:-**
#IBAction func sortClicked(_ sender: UIButton) {
presentPopOver("PopOverVC", sender: sender)
}
***presenting pop over and to get and pass data:-***
#IBAction func sortClicked(_ sender: UIButton) {
let vc = presentPopOver("PopOverVC", sender: sender) as? PopOverVC
vc?.arrayNames = ["name1","name2"]
vc?.callBack = {name in
print(name)
vc?.dismiss(animated: true)
}
}