Question

我正在尝试创建一种禁用Button的方法。这是我制作的应用程序，它是一个鸡蛋计时器，我遇到了一个bug;当我多次按下播放按钮时，定时器加速，我无法停止。我想创建一个禁用功能，但我在论坛上看到的所有内容都表示要使用。 enable = true。当我使用这个Xcode时说它无效。在Xcode 8中启用和禁用按钮的正确代码是什么？

import UIKit

class ViewController: UIViewController {

    var timer = Timer()
    var myCount = 210
    var button = 0

    func processTimer() {

        //what happens every second

        counter()

    }

    func startTimer() {
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.processTimer), userInfo: nil, repeats: true)
        button = 1
    }

    func pauseTimer() {
        timer.invalidate()
        button = 0
    }

    func resetTimer(){
        timer.invalidate()
        myCount = 210
        countdown.text = "\(myCount)"
        button = 0
    }

    func counter() {
        myCount -= 1
        if myCount > 0 {
            countdown.text = "\(myCount)"
        } else {
            countdown.text = "0"
            timer.invalidate()
        }
    }

    func add(){
        myCount += 10
        if myCount > 0 {
            countdown.text = "\(myCount)"
        } else {
            countdown.text = "0"
        }
    }

    func sub(){
        myCount -= 10
        if myCount > 0 {
            countdown.text = "\(myCount)"
        } else {
            countdown.text = "0"
        }
    }






    // timer countdown
    @IBOutlet var countdown: UILabel!

    // pause button
    @IBAction func pauseButton(_ sender: AnyObject) {
        pauseTimer()
        print("Timer Paused")
    }


    //play button
    @IBAction func playButton(_ sender: AnyObject) {
        startTimer()
        print("Timer started")
    }


    // -10 seconds
    @IBAction func minusTen(_ sender: AnyObject) {
        sub()



    }
    // reset timer to 290
    @IBAction func resetButton(_ sender: AnyObject) {
        resetTimer()
        print("Timer Reset")
    }






    // +10 seconds
    @IBAction func addTen(_ sender: AnyObject) {
        add()
    }

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

        countdown.text = "\(myCount)"

        if button == 0{
            playButton.enabled = true
        }




    }

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


}

Answer 1

enabled/disable Button有两种方法。

playButton.isEnabled = false // This will give the (style) effect of disable to button

或

playButton.userInteractionEnabled = false // This will not give the (style) effect of disable
                                         to button simply stop the user interaction

Answer 2

您需要做的第一件事就是为按钮添加插座。您已经创建了该功能，但如果您想进行更改，则需要一个单独的插座 - 类似这样的

    @IBOutlet weak var cmdPlayButton: UIButton!

然后，如果您想在计时器运行时防止多次按下按钮，则需要在按下按钮后立即禁用该按钮，并且仅在计时器结束时重新启用该按钮

//play button
@IBAction func playButton(_ sender: AnyObject) {
    cmdPlayButton.enabled = false
    startTimer()
    print("Timer started")
}

只需记住在计时器完成或重置时启用按钮，您将需要处理暂停功能 - 您可以更改播放按钮上的文字以阅读“重启”按钮。例如。

启用和禁用Xcode 8按钮

2 个答案: