CODEWITHSUNDEEP
swiftuipopoverpresentationcontroller
paco8
paco8

Reputation: 83

Swift: Set UIBarButtonItem as source for popover WITHOUT tap?

I want to show a popover on iPad as soon as my view loads having as source a button on the top right corner. The popover displays properly on button tap, but I'm having trouble finding a way to display it without the button tap, when the page first loads. Is this possible?

This is what I have:

func displayOptions(sourceButton: UIBarButtonItem)
    let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
    if let popoverController = actionSheet.popoverPresentationController {
        var rect = CGRect(x: 0, y: 0, width: 0, height: 0)              
        popoverController.barButtonItem = sourceButton              
        popoverController.sourceRect = rect 
        popoverController.permittedArrowDirections = .up
    }
    viewController.present(actionSheet, animated: true, completion: nil)
}

This code works properly on button tap, but the app crashes if I try to call this function from viewDidLoad or viewDidAppear:

You must provide location information for this popover through the alert controller's popoverPresentationController. You must provide either a sourceView and sourceRect or a barButtonItem.

Upvotes: 1

Views: 1076

Answers (2)

JackDao
JackDao

Reputation: 513

Try using UIPopoverPresentationControllerDelegate

Code example:

  • viewDidLoad 

    let buttonCustom = UIBarButtonItem(title: "Custom", style: .done, target: self, action: #selector(ViewController.customBarButtonAction))
self.navigationItem.rightBarButtonItem  = buttonCustom
displayOptions()

  • displayOptions 

    func displayOptions() {
    let actionSheet = UIAlertController(title: "Title", message: "Message", preferredStyle: .actionSheet)
    if let popoverController = actionSheet.popoverPresentationController {
        let rect = CGRect(x: 0, y: 0, width: 0, height: 0)
        popoverController.sourceRect = rect
        popoverController.sourceView = self.view
        popoverController.permittedArrowDirections = .up
        popoverController.delegate = self
    }
    self.present(actionSheet, animated: true, completion: nil)
}

  • using UIPopoverPresentationControllerDelegate

    func prepareForPopoverPresentation(_ popoverPresentationController: UIPopoverPresentationController) {
    popoverPresentationController.barButtonItem = self.navigationItem.rightBarButtonItem
}

Upvotes: 2

Harish
Harish

Reputation: 2512

  1. You need to provide the sourceView.

  2. UIAlertController must have a title, a message or an action to display.

    // Create a bar button item in ViewDidLoad.
let button1 = UIBarButtonItem(image: UIImage(named: "imagename"), style: .plain, target: self, action: Selector("action"))
self.navigationItem.rightBarButtonItem  = button1


// Call in ViewDidLoad
displayOptions(sourceButton: button1)

func displayOptions(sourceButton: UIBarButtonItem) {
    let actionSheet = UIAlertController(title: "title", message: "message", preferredStyle: .actionSheet)
    if let popoverController = actionSheet.popoverPresentationController {
      let rect = CGRect(x: 0, y: 0, width: 0, height: 0)
      popoverController.barButtonItem = sourceButton
      popoverController.sourceRect = rect
      popoverController.sourceView = self.view
      popoverController.permittedArrowDirections = .up
    }
    self.present(actionSheet, animated: true, completion: nil)
}

Upvotes: 0

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