How to show an NSAlert sheet modal on first run?

Question

Created Jun ’17

Replies 2

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Views 2.5k

Participants 2

I want to show an NSAlert sheet modal when my single-window app first launches, but doing so makes the window jump when it first opens.

The window is restoring the user's last chosen size & position (I have set the "Autosave name" in IB). This works, but appears to be done AFTER my code that shows the modal sheet.

I'm only really talking about the following 3 lines of code:

override func viewDidAppear() {
    let alert = NSAlert.init() 
    alert.beginSheetModal(for: self.view.window!) { (returnCode: NSModalResponse) -> Void in
    } 
}

I'm guessing viewDidAppear() doesn't mean the window has finished positioning and sizing itself from the user defaults, but for the life of me cannot find a method that gives this to me.

Since a picture is worth a thousand words, I've put up a demo at https://github.com/jeff-h/WindowPositioning

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Answer 1

Claude31 OP

Jun ’17

Accepted Answer

To position the initial window, I do it in

func applicationDidFinishLaunching(aNotification: NSNotification) { }

You could probably do

func applicationDidFinishLaunching(aNotification: NSNotification) {
    let alert = NSAlert.init()  
    alert.beginSheetModal(for: self.view.window!) { (returnCode: NSModalResponse) -> Void in 
    }  
}

0

Answer 2

Marmalade OP

Jun ’17

Oh man... it works! I could have sworn I'd tried applicationDidFinishLaunching. I even thought I'd found that the keywindow wasn't yet available at that point. I'm obviously going mad 🙂

Thanks so much for your help.

    func applicationDidFinishLaunching(_ aNotification: Notification) {
        let alert = NSAlert.init()
        let window = NSApplication.shared().keyWindow!
        alert.beginSheetModal(for: window) { (returnCode: NSModalResponse) -> Void in
        }
    }

1