Make a Cocoa application quit when the main window is closed?

Question

How to make a Cocoa application quit when the main window is closed? Without that you have to click on the app icon and click quit in the menu.

Answer 1

As the question is mainly about Cocoa programming and not about a specific language (Objective-C), here is the Swift version of Chuck's and Steve's answer:

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    func applicationShouldTerminateAfterLastWindowClosed(sender: NSApplication) -> Bool {
        return true
    }

    // Your other application delegate methods ...

}

For Swift 3 change the method definition to

func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
    return true
}