Xcode Mac 应用程序 (Swift) 问题

Question

I am working on a Mac application using Swift.

And I got a lot of problems there cause I thought it would be the same as I did it in the iOS application

I am really sorry about this long post :(

The first problem:

The error: "Method does not override any method from its superclass"

The code:

import Cocoa

class CreateAccountViewController: NSViewController {

@IBOutlet weak var emailTextField: NSTextField!
@IBOutlet weak var passwordTextField: NSSecureTextField!
override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

The next one:

Error:Value of type 'CreateAccountViewController' has no member 'dismissViewControllerAnimated'

Code:

self.dismissViewControllerAnimated(true, completion: nil)

The last one:

The error: Use of unresolved identifier 'UIAlertController'

The code:

let alert = UIAlertController(title: "Error", message: "Enter Email and Password", preferredStyle: .Alert)

I am so sorry but this is my first time I wrote a Mac application.

Answer 1

UIAlertController is part of UIKit Library which is only available on iOS.

You'll need to use NSAlert to pop an alert in a window on Mac OS X. You also need to do an import AppKit at the top of your Swift file.