ios - 无法识别的选择器...错误？

Question

我根据其他人指出的内容编辑了一些代码，但我不断收到上述错误，说我发送了一个“无法识别的选择器”。我的计时器的选择器，最初是错误的，已被修改，但 Xcode 仍在提示。

这是我的代码:

import UIKit

class ViewController: UIViewController {

@IBOutlet var instructionsNew: UILabel!

@IBOutlet var lockStatusNew: UIImageView!

@IBOutlet var timerText: UILabel!



@IBAction func hackLockButton(sender: AnyObject){

    var counter = 0





let timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self,     selector: "updateCounter", userInfo: nil, repeats: true)
func updateCounter() {
        timerText.text = String(counter++)
    }

    while(timerText.text == "1") {instructionsNew.text = "loading"}

    while(timerText.text == "2"){instructionsNew.text = "loading."}

    while(timerText.text == "3") {instructionsNew.text = "loading.."}

    while(timerText.text == "4"){instructionsNew.text = "loading..."}

    while(timerText.text == "5") {instructionsNew.text = "hack successful!"
        lockStatusNew.image = UIImage(named: "unlocked.png")
        timer.invalidate()

    }

}



override func viewDidLoad() {

    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

请帮我找出问题所在。谢谢!

Answer 1

问题是，您在 hackLockButton 函数中添加了 updateCounter。您应该将该方法放在该函数之外，它会起作用。

@IBAction func hackLockButton(sender: AnyObject)
{
   // Code here
}

func updateCounter()
{
     timerText.text = String(counter++)
}

建议:

您不想编写 while(timerText.text == "1") {instructionsNew.text = "loading"} 来显示该标签。它可能会导致无限循环并挂起您的 UI。而是使用像这样的开关盒:

switch(counter)
{
  case 1: instructionsNew.text = "loading"
  // Write other cases too
}