How do I write an NSAlert in latest swift?

Question

I'm trying to write this alert:

func alertUser() {
        let alert = NSAlert()
        alert.messageText = "message 1"
        alert.informativeText = "info1"
        alert.informativeText = "info2"
        alert.addButton(withTitle: "NO")
        alert.addButton(withTitle: "YES")
        alert.beginSheetModal(for: self.view.window!) { (returnCode: NSModalResponse) -> Void in
            print ("returnCode: ", returnCode)
        }

but I get the dreaded unexpectedly found nil while unwrapping an Optional value message on the line alert.beginSheetModal

Please tell me what I'm doing wrong.

Thanks

I'd suggest checking to see if `self.view.window` was `nil`... — Rob, Sep 10 '16 at 14:41
Possible duplicate of http://stackoverflow.com/questions/29433487/create-an-nsalert-with-swift — Eric Aya, Sep 10 '16 at 14:41
Thanks Eric, but I'm looking for a panel sheet. Does your question resolve that? — ICL1901, Sep 10 '16 at 14:45
@EricAya, thanks for bearing with me.. I want an NSAlert that is attached to the main window. — ICL1901, Sep 10 '16 at 14:49
I solved it by moving the call to the alert to viewDidAppear. Thanks for all the pointers.. — ICL1901, Sep 10 '16 at 15:33

score 4 · Accepted Answer · answered Sep 17 '16 at 17:49

4

You should run your code from viewDidAppear because your view controller has not created a window object in viewDidLoad.

override func viewDidAppear() {
    super.viewDidAppear()

    alertUser()
}

answered Sep 17 '16 at 17:49

Michael Samoylov

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Thanks Michael, this is the solution! – ICL1901 Sep 17 '16 at 18:52

How do I write an NSAlert in latest swift?

1 Answers1