隱藏和顯示（子視圖）按鈕或更改標題？

我的子視圖有問題。我有2個可見的按鈕和1，它應該顯示後點擊第一個。更準確地說，我有開始按鈕，重置按鈕和停止按鈕。加載時應該只顯示「開始」和「重置」按鈕，但是當我按下開始按鈕時，應該隱藏「重置」按鈕並顯示停止按鈕。像isHidden這樣的語法不起作用。問題是什麼？隱藏和顯示（子視圖）按鈕或更改標題？

星，停止和復位按鈕：

var stopButton: UIButton{ 

    let stopButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100)) 
    stopButton.backgroundColor = .white 
    stopButton.setTitle("Stop", for: .normal) 
    stopButton.addTarget(self, action: #selector(stopButtonAction), for: .touchUpInside) 
    stopButton.layer.cornerRadius = 50 
    stopButton.layer.masksToBounds = true 
    stopButton.isHidden = true 

    return stopButton 
} 

var resetButton: UIButton{ 

    let resetButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100)) 
    resetButton.backgroundColor = .red 
    resetButton.setTitle("Reset", for: .normal) 
    resetButton.addTarget(self, action: #selector(resetButtonAction), for: .touchUpInside) 
    resetButton.layer.cornerRadius = 50 
    resetButton.layer.masksToBounds = true 

    return resetButton 
} 

var startButton: UIButton{ 

    let startButton = UIButton(frame: CGRect(x: 50, y: 50, width: 100, height: 100)) 
    startButton.backgroundColor = .green 
    startButton.setTitle("Start", for: .normal) 
    startButton.addTarget(self, action: #selector(startButtonAction), for: .touchUpInside) 
    startButton.layer.cornerRadius = 50 
    startButton.layer.masksToBounds = true 

    return startButton 
}

在這裏，我添加此子視圖（本功能也添加UIView的，這就是所謂的viewDidLoad中）：

func addBottomView() 
{ 
    let orginX = (collectionView?.frame.minX)! 
    let orginY = (collectionView?.frame.maxY)! 
    let heightOfView = view.frame.height - (view.frame.height/100) * 70 

    let bottomView = UIView(frame: CGRect(x: orginX, y: orginY, width: view.frame.width, height: heightOfView)) 
    bottomView.backgroundColor = .orange 

    view.addSubview(bottomView) 

    bottomView.addSubview(stopButton) 
    bottomView.addSubview(startButton) 
    bottomView.addSubview(resetButton) 


}

這裏是我的功能，這是連接到這個按鈕：

func startButtonAction() 
{ 
    blinkAction() 
    print("START ACTION") 

    resetButton.isHidden = true 
    stopButton.isHidden = false 
    view.layoutSubviews() 
} 

func resetButtonAction() 
{ 
    print("RESET ACTION") 
    blinkAction() 

} 
func stopButtonAction() 
{ 
    print("STOP ACTION") 
    blinkAction() 

    resetButton.isHidden = false 
    stopButton.isHidden = true 
    view.layoutSubviews() 

}

我添加layoutSubviews方法，但它沒有幫助。我也嘗試使用隱藏的按鈕名稱之前，但我也不工作。有什麼建議？

來源

2017-05-25 Mateusz Hejwosz

計算的特性創建按鈕，爲什麼你在STOPBUTTON計算財產使用「stopButton.isHidden =真」？ –

因爲在加載停止按鈕應該被隱藏。只有點擊開始按鈕後 –

可以使用懶keywoard

lazy var stopButton: UIButton = { 
     let stopButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100)) 
     stopButton.backgroundColor = .yellow 
     stopButton.setTitle("Stop", for: .normal) 
     stopButton.addTarget(self, action: #selector(stopButtonAction), for: .touchUpInside) 
     stopButton.layer.cornerRadius = 50 
     stopButton.isHidden = true 
     stopButton.layer.masksToBounds = true 
     return stopButton 
    }() 

    lazy var resetButton: UIButton = { 
     let resetButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100)) 
     resetButton.backgroundColor = .red 
     resetButton.setTitle("Reset", for: .normal) 
     resetButton.addTarget(self, action: #selector(resetButtonAction), for: .touchUpInside) 
     resetButton.layer.cornerRadius = 50 
     resetButton.layer.masksToBounds = true 
     return resetButton 
    }() 

    lazy var startButton: UIButton = { 
     let startButton = UIButton(frame: CGRect(x: 50, y: 50, width: 100, height: 100)) 
     startButton.backgroundColor = .green 
     startButton.setTitle("Start", for: .normal) 
     startButton.addTarget(self, action: #selector(startButtonAction), for: .touchUpInside) 
     startButton.layer.cornerRadius = 50 
     startButton.layer.masksToBounds = true 
     return startButton 
    }()

來源

2017-05-25 12:55:37 Donal

計算出的屬性startButton，stopButton，resetButton不是作爲子視圖添加的相同項目。計算屬性不存儲值，它們爲您提供獲取值和設置更改的方法。所以你採取的行動是隱藏的不適用於你的觀點。

來源

2017-05-25 12:02:25 Gerriet

isHidden屬性效果不好的原因是，當你的計算屬性變量你得到一個新的實例UIButton而不是舊的。如果你想要使用計算屬性，那麼你應該創建懶惰屬性。所以，無論何時你調用屬性變量，你都會得到一個UIButton的舊實例。

來源

2017-05-25 12:03:16

你的屬性總是創建新的按鈕，所以你的引用將不會相同。當您設置isHidden時，您的按鈕將被重新創建，以便設置未添加到bottomView的另一個按鈕的isHidden propery。

只需使用普通的屬性：

var stopButton: UIButton! 
var resetButton: UIButton! 
var startButton: UIButton!

創建按鈕：

func createButtons() { 

let stopButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100)) 
stopButton.backgroundColor = .white 
stopButton.setTitle("Stop", for: .normal) 
stopButton.addTarget(self, action: #selector(stopButtonAction), for: .touchUpInside) 
stopButton.layer.cornerRadius = 50 
stopButton.layer.masksToBounds = true 
stopButton.isHidden = true 

let resetButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100)) 
resetButton.backgroundColor = .red 
resetButton.setTitle("Reset", for: .normal) 
resetButton.addTarget(self, action: #selector(resetButtonAction), for: .touchUpInside) 
resetButton.layer.cornerRadius = 50 
resetButton.layer.masksToBounds = true 

let startButton = UIButton(frame: CGRect(x: 50, y: 50, width: 100, height: 100)) 
startButton.backgroundColor = .green 
startButton.setTitle("Start", for: .normal) 
startButton.addTarget(self, action: #selector(startButtonAction), for: .touchUpInside) 
startButton.layer.cornerRadius = 50 
startButton.layer.masksToBounds = true 
}

添加爲子視圖：

bottomView.addSubview(stopButton) 
bottomView.addSubview(startButton) 
bottomView.addSubview(resetButton)

，並利用它們：

resetButton.isHidden = false 
stopButton.isHidden = true

來源

2017-05-25 12:04:53

隱藏和顯示（子視圖）按鈕或更改標題？

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