CODEWITHSUNDEEP
swiftmacoscocoansapplication-delegate
Allactaga
Allactaga

Reputation: 193

NSApplicationDelegate's applicationDidFinishLaunching is not being called

I've been trying to play with Swift 3, but I am unable to get started. The following code is compiling, however it does not log anything. Looks like applicationDidFinishLaunching is not being called. Am I missing some critical piece here?

Sources/main.swift:

import AppKit

class AppDelegate: NSObject, NSApplicationDelegate {
    func applicationDidFinishLaunching(aNotification: NSNotification) {
        NSLog("application start")
    }
}

NSApplication.shared()
NSApp.setActivationPolicy(.regular)
let controller = AppDelegate()
NSApp.delegate = controller
NSApp.run()

p.s. There is a similar question about applicationDidFinishLaunching being called but not printing anything. I believe that this is not the case, as having window.orderFrontRegardless() instead of logging also has no effect for me.

System Version: OS X 10.11.6

> swift --version
Apple Swift version 3.0 (swiftlang-800.0.43.6 clang-800.0.38)
Target: x86_64-apple-macosx10.9

Upvotes: 5

Views: 5444

Answers (6)

khirish
khirish

Reputation: 575

There could be deletion of Application scene from storyboard. This happens with me as well. So in this case, you can create a new empty project and follow steps below -

  1. Open Main.storyboard file as source code.
  2. Start copying after . From to . After this you will find
  3. Replace copied code to your project file in same way you did for copying, that is after and before and DONE
  4. Verify this my opening storyboard file in interface builder, you will see Application scene is connected.

You can change title by clicking on it and can change top menu as well.

Upvotes: 0

SwiftDev19
SwiftDev19

Reputation: 321

Should work with MacOS 11+

Since none of the answers had the component I am using, here is my approach. Keep in mind, that I do all of it in the same file but that is not necessary.

  1. First import the necessary kit:

    import Appkit // For Macos
import UIKit // For Mobile

  2. Add the delegate

Then add the AppDelegate class under your main App struct. When you write the class (without the function) and start typing func app... Xcode will already give you possible suggestions. When you find the right function just autocomplete it and let Xcode generate it for you.

class AppDelegate: NSObject, NSApplicationDelegate { // For MacOS
    func applicationDidFinishLaunching(_ notification: Notification) {
        print("did start")
        NSLog("application start")
    }
}

For Mobile use UIApplicationDelegate instead of NSApplicationDelegate

  1. Use the Property Wrapper Adaptor

In your main struct add your delegate like this in a property wrapper.

 @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate // MacOS
@UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate // Mobile

Upvotes: 0

Paul Stevenson
Paul Stevenson

Reputation: 145

for me... I had no windows visible at launch. As soon as I ticked that box on one of the windows, applicationDidFinishLaunching was called when I ran the app.

Upvotes: 0

aToz
aToz

Reputation: 2464

I'd a similar problem where func applicationDidFinishLaunching(_ aNotification: Notification) was not getting called.

For me, the issue was with the App Delegate referencing outlet.

enter image description here

Solution: Just removing it and then connecting it back had resolved the issue for me.

This is how you can recreate a connection

enter image description here

Upvotes: 3

R. Rincón
R. Rincón

Reputation: 361

The line where you refer to, but don't use NSApplication.shared looks like a typo. If you replace it with NSApp = NSApplication.shared, and make sure the method signature in AppDelegate is correct it, should work.

Upvotes: 0

OOPer
OOPer

Reputation: 47876

If you want to implement Objective-C protocols in Swift 3, you need to use _ indicating the method has no label for the first parameter.

func applicationDidFinishLaunching(_ aNotification: Notification) {

(UPDATE)

Sorry, in my first code, I have forgotten to to replace NSNotification with Notification. (Thanks, Leo Dabus.)

Upvotes: 4

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