Global function call in Swift? Howto?

问题:

I have a Swift noobie question on class method calls. I'm building a simple learning app for my kids using Sprite Kit. I have a global variable scoreCount defined in GameScene, where I pretty much do all my game logic such as detect correct answer and increment scoreCount. I also have GameOverScene. On both I show the Score -label. I'm keeping count of scores with the scoreCount-parameter (in GameScene). However as I'm quite new to Swift and Sprite Kit, I'm wondering how should I update the score label in GameViewController? So basically I would like to call GameViewController.updateLabels() from GameScene.

I know this isn't the ideal way but please share your solution concept on this. Thanks!

回答1:

Well. In your GameViewController you have to transform your func in class func like this

class func yourFunc {
 //your code
}

To call it from your GameScene just this code :

GameViewController.yourFunc()

Don't forget you are creating a global function so all variables in it have to be global too.

For you label (global):

var label:UILabel = UILabel()

in Your GameViewController:

class GameViewController : UIViewController {
    override func viewDidLoad() {
    super.viewDidLoad()

    label.text = "bonjour" // to set the text
    label.frame = CGRectMake(0, 0, 100, 100) / set the position AND size CGRectMake (x, y, width, heigth)

    label.textColor = UIColor.redColor() // set your color
    label.center = CGPointMake(self.view.frame.width/2, self.view.frame.height/2) // set the position from x=0 and y=0
    self.view.addSubview(label) // add the label to your screen

I hope it will help you.