My solution

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

[code]import Cocoa

class MainWindowController: NSWindowController {

var sliderOldValue: Double?
var sliderDefaultTickMarks: Int?
var sliderDefaultValue: Double?

@IBOutlet weak var slider: NSSlider!
@IBOutlet weak var sliderLabel: NSTextField!
@IBOutlet weak var radioShowTicks: NSButton!
@IBOutlet weak var radioHideTicks: NSButton!
@IBOutlet weak var checkbox: NSButton!
@IBOutlet weak var secretMessage: NSTextField!
@IBOutlet weak var decodedMessage: NSTextField!

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

override func windowDidLoad() {
    super.windowDidLoad()
    // get the number of tick marks defined in the xib
    sliderDefaultTickMarks = slider.numberOfTickMarks
    sliderDefaultValue = slider.doubleValue
    // set everything up
    initialiseControls()
}

@IBAction func resetButton(sender: NSButton) {
    initialiseControls()
}

func initialiseControls() {
    sliderOldValue = sliderDefaultValue!
    slider.doubleValue = sliderOldValue!
    adjustSlider(slider)
    slider.numberOfTickMarks = sliderDefaultTickMarks!
    radioShowTicks.state = NSOnState
    secretMessage.stringValue = ""
    decodedMessage.stringValue = ""
    checkbox.state = NSOffState
    setCheckboxText(checkbox)
}

@IBAction func adjustSlider(sender: NSSlider) {
    let sliderValue: Double = sender.doubleValue
    if sliderValue < sliderOldValue {
        sliderLabel.stringValue = "Slider goes down!"
    } else if sliderValue > sliderOldValue {
        sliderLabel.stringValue = "Slider goes up!"
    } else {
        sliderLabel.stringValue = ""
    }
    sliderOldValue = sliderValue
}

@IBAction func changeSliderTickMarks(sender: NSButton) {
    let tag = sender.tag
    if tag == 1 { // hide tick marks
        slider.numberOfTickMarks = 0
    } else if tag == 2 { // show tick marks
        slider.numberOfTickMarks = sliderDefaultTickMarks!
    }
}

@IBAction func setCheckboxText(sender: NSButton) {
    let checked = sender.state
    if (checked == NSOffState) {
        sender.title = "Check me"
    } else if (checked == NSOnState) {
        sender.title = "Uncheck me"
    }
}

@IBAction func revealSecretMessage(sender: NSButton) {
    decodedMessage.stringValue = secretMessage.stringValue
}

}[/code]

I decided to show off by reading the number of tick marks from the xib rather than having it in two places :slight_smile: