ios - 无法隐藏 UIButton？

Question

我试图让自定义 UIButton 在按下一定次数后隐藏起来......但我不知所措。

在耗尽了我有限的知识并查阅了 Apple 的文档以及 3 个小时的互联网之后，我终于来到了这里。我学习 Swift 已经有一段时间了，并且正在努力变得更加熟悉它。这是我的第一个面向对象语言，至少可以说它在考验我。非常感谢您对这个很可能是荒谬的简单问题的任何帮助。

import UIKit

class ViewController: UIViewController{

@IBOutlet weak var buttonMessageDisplay: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    buttonPressed()
}

var tapcount = 0

let buttonMessage : [String] = [/* long array of strings */]

func buttonPressed() {

    let button = UIButton(type:.Custom) as UIButton
    button.frame = CGRectMake(0, 0, 100, 100)
    button.center = CGPointMake(self.view.frame.size.width/2, self.view.frame.size.height/2);
    button.backgroundColor = UIColor.redColor()
    button.layer.borderColor = UIColor.blackColor().CGColor
    button.layer.borderWidth = 3
    button.layer.cornerRadius = 0.5 * button.bounds.size.width
    button.setTitle("", forState: UIControlState.Normal)
    button.addTarget(self, action: "buttonPressed", forControlEvents: .TouchUpInside)
    view.addSubview(button)


    switch tapcount {

    case 19...23:
        //Hides the button
        button.hidden = true
        buttonMessageDisplay.text = buttonMessage[tapcount]

    case 24...31:
        //Unhides the button
        button.hidden = false
        buttonMessageDisplay.text = buttonMessage[tapcount]

    default:
        buttonMessageDisplay.text = buttonMessage[tapcount]
    }

    print("Tap Count: \(tapcount)")
    ++tapcount

}

更新了手势识别器:

import UIKit

class ViewController: UIViewController{

@IBOutlet weak var buttonMessageDisplay: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    buttonMessageDisplay.text = ""

    let button = UIButton(type:.Custom) as UIButton
    button.frame = CGRectMake(0, 0, 100, 100)
    button.center = CGPointMake(self.view.frame.size.width/2, self.view.frame.size.height/2);
    button.backgroundColor = UIColor.redColor()
    button.layer.borderColor = UIColor.blackColor().CGColor
    button.layer.borderWidth = 3
    button.layer.cornerRadius = 0.5 * button.bounds.size.width
    button.setTitle("", forState: UIControlState.Normal)
    button.addTarget(self, action: "buttonPressed", forControlEvents: .TouchUpInside)
    self.view.addSubview(button)
}


var tapcount : Int = 0

let buttonMessage : [String] = [/* array of strings */]

@IBAction func userTap(sender: UITapGestureRecognizer) {
    print("Tap Received")
    if case 19...23 = tapcount {
        buttonPressed()
    }
}



func buttonPressed() {

    switch tapcount {

    case 0...18:
        buttonMessageDisplay.text = buttonMessage[tapcount]

    case 19...23:
        //Hides the button
        button.hidden = true
        buttonMessageDisplay.text = buttonMessage[tapcount]

    case 24...32:
        //Unhides the button
        button.hidden = false
        buttonMessageDisplay.text = buttonMessage[tapcount]

    case 33...100:
        buttonMessageDisplay.text = buttonMessage[tapcount]

    default:
        print("There are no more messages or an error has been encountered")
    }

    print("Tap Count: \(tapcount)")
    ++tapcount
}

Answer 1

您的代码毫无意义。正如@formal 在他的回答中所说，您在每次点击时都创建了一个新按钮，这是错误的。

您想在 Storyboard 中定义按钮。

然后您需要一个 IBAction 方法，它将按钮作为参数:

@IBAction func buttonPressed(sender: UIButton) 
{
  ++tapcount
  if tapcount < 19
  {
    sender.hidden = true
  }
}

请注意，如果您要隐藏的按钮与用户正在点击的按钮相同，那么一旦它被隐藏，您就完成了。用户无法点击隐藏按钮，因此无法取消隐藏。 (因此你的 switch 语句没有意义)