Another solution for BusyApp

Cocoa Programming for OS X (5th Edition) 5. Controls
1

class MainWindowController: NSWindowController {

static var numberOfTickMarks = 10

@IBOutlet weak var slider: NSSlider!
@IBOutlet weak var labelSlider: NSTextField!
@IBOutlet weak var secureTextField: NSTextField!
@IBOutlet weak var revealTextField: NSTextField!
@IBOutlet weak var checkMe: NSButton!
@IBOutlet weak var showTickMark: NSButton!


override var windowNibName: String? {
    return "MainWindowController"
}

var positionSlider: Double = 0{
    
    willSet {
        
    }
    
    didSet {
        
        if positionSlider > oldValue {
            labelSlider.stringValue = "Slider goes\n up!"
        } else {
            labelSlider.stringValue = "Slider goes\n down!"
        }
    }
}

var descriptionCheck: String {
    return (checkMe.state==NSOnState) ? "Uncheck me" : "Check me"
}

override func windowDidLoad() {
    super.windowDidLoad()
    resetControls()
}

private func resetControls() {
    //slider
    labelSlider.stringValue=""
    showTickMark.state = NSOnState
    slider.doubleValue = 0
    self.slider.numberOfTickMarks = MainWindowController.numberOfTickMarks
    
    //check me
    checkMe.state = NSOnState
    checkMe.title = descriptionCheck
    
    //secure textfield
    revealTextField.stringValue = ""
    secureTextField.stringValue = ""
    secureTextField.placeholderString = "Type in a secret message"
}


@IBAction func adjustSlider(sender: NSSlider) {
    self.positionSlider = slider.doubleValue
}

@IBAction func toggleTickMarks(sender: NSButton) {
    slider.numberOfTickMarks = sender.tag==0 ? MainWindowController.numberOfTickMarks : 0
}

@IBAction func checkMe(sender: NSButton) {
    checkMe.title = self.descriptionCheck
}

@IBAction func resetControls(sender: NSButton) {
    self.resetControls()
}

@IBAction func revealSecretMessage(sender: NSButton) {
    revealTextField.stringValue = secureTextField.stringValue
}

}