swift - 如何使用 UIStepper 快速将整数放入文本字​​段

Question

如何使用 Swift 从 UIStepper 将整数放入文本字​​段？

这就是我在Objective C中的做法：

- (IBAction)oneClicker:(UIStepper *)sender {
    self.oneValue.text = [NSString stringWithFormat:@"%d",
                          [[NSNumber numberWithDouble:[(UIStepper *)sender value]] intValue]];
    AudioServicesPlaySystemSound(_PlaySound);
}

Answer 1

这很简单

@IBOutlet weak var oneValue: UITextField!

@IBAction func oneClicker(sender: UIStepper) {
    self.oneValue.text = Int(sender.value).description
}

Answer 2

这是我如何让它工作不知道是否是最好的方法，但它就是

  @IBOutlet weak var oneClicker: UIStepper!

 @IBAction func oneClicker(sender: UIStepper) {
    oneValue.text =  "\(Int(oneClicker.value))"
        }

Answer 3

在上面尝试时，出现错误。尝试了一些不同的东西，它奏效了。

@IBOutlet var quantity: UILabel!    
@IBOutlet var StepCounter: UIStepper!
override func viewDidLoad() {
    super.viewDidLoad()

    StepCounter.autorepeat = true
    StepCounter.maximumValue = 10.0
    StepCounter.minimumValue = 1.0
    println(StepCounter.value)
    quantity.text = "\(Int(StepCounter.value))"
    StepCounter.addTarget(self, action: "stepperValueDidChange:", forControlEvents: .ValueChanged)

}

func stepperValueDidChange(stepper: UIStepper) {

    let stepperMapping: [UIStepper: UILabel] = [StepCounter: quantity]

    stepperMapping[stepper]!.text = "\(Int(stepper.value))"
}