CODEWITHSUNDEEP
objective-cmacoscocoa
Jack Humphries
Jack Humphries

Reputation: 13267

Don't dismiss NSAlert when button is clicked

I'm showing an NSAlert with a custom view and three buttons. The custom view has two text fields and it allows the user to log in.

In the Mac App Store, an NSAlert with a similar design comes up. When the user clicks the sign in button, the NSAlert does not dismiss (until the credentials are verified). How does Apple keep the alert up?

Upvotes: 4

Views: 3373

Answers (2)

Madmoron
Madmoron

Reputation: 188

Swift 4 style

let alert = NSAlert()
alert.alertStyle = .informational
alert.messageText = "Y/N?"
alert.addButton(withTitle: "Y")
alert.addButton(withTitle: "N")

guard let window = view.window else { return } // for NSViewController

alert.beginSheetModal(for: window) { res in
    if res == .alertFirstButtonReturn {
        // "Y" action
    } else {
        // "N" action        
    }
}

Upvotes: -1

Jonathan Grynspan
Jonathan Grynspan

Reputation: 43472

Get the NSButton you want to behave differently. Change its target and action. (To call through to the original target/action, preserve them before you change them.)

NSAlert *alert = ...;
NSButton *button = [[alert buttons] objectAtIndex:...];

id oldTarget = [button target];
SEL oldAction = [button action];
[button setTarget:self];
[button setAction:@selector(verifyCredentials:)];

Alternatively, you may want to build the alert as a custom window controller and XIB (which is how Apple did it in the case of the App Store.) In that case, you have fine-grained control over button behaviour.

Upvotes: 11

Related Questions