如果不是Initial View Controller，则无法将操作发送给第一响应者

Question

I'm trying to create sliding menu similar to Code Menu in SpringApp here (see CodeViewController):

https://github.com/MengTo/Spring/blob/master/SpringApp

It works just fine as long as SpringViewController is Initial View Controller.

If I create another ViewController and make it initial then minimizeView/maximizeView is never getting called:

UIApplication.sharedApplication().sendAction("minimizeView:", to: nil, from: self, forEvent: nil)

In this method "to:" is set to nil to use the first responder. So it looks like when SpringViewController stops being initial view controller it's no longer first responder.

How do I fix it to make minimizeView and maximizeView actions defined in SpringViewController always work?

Answer 1

I found a workaround using notification center.

In SpringViewController add:

override func viewDidLoad() {
  super.viewDidLoad()

  // Add observer in notification center
  // It receives notifications from menu
  NSNotificationCenter.defaultCenter().addObserver(
    self,
    selector: "minimizeView:",
    name: "minimizeView",
    object: nil)
  NSNotificationCenter.defaultCenter().addObserver(
    self,
    selector: "maximizeView:",
    name: "maximizeView",
    object: nil)
  }

In OptionsViewController:

  override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(true)
    // skipped ...
    // Post notification
    NSNotificationCenter.defaultCenter().postNotificationName("minimizeView", object: nil)
  }

@IBAction func closeButtonPressed(sender: AnyObject) {
    // skipped...
    // Post notification
    NSNotificationCenter.defaultCenter().postNotificationName("maximizeView", object: nil)
    // skipped...
}

This makes maximizeView and minimizeView work properly. I wonder if the approach with first responder is better.