ios - 从编程 uibutton 属性访问全局变量

Question

我想使用相同的 UIView 类来录制和播放声音。在这个 View 类中，我以编程方式添加了一个按钮，我想根据 View 的用途更改按钮文本。当 View 作为播放器创建时，它将显示播放图标(或现在的文本)。如果 View 创建为记录器，它将显示记录图标。但是我无法从我的 UIButton 访问 View 中的全局变量。

class AudioPlayerView: UIView {
  var isRecorder = false

override init(frame: CGRect) {
    super.init(frame: frame)

   ...

}
let theButton: UIButton = {
    let button = UIButton()

    if isRecorder {
        button.setTitle("▷", for: .normal)
        button.addTarget(self, action: #selector(playPauseAudio), for: .touchUpInside)
    } else {
        button.setTitle("▢", for: .normal)
        button.addTarget(self, action: #selector(recordTapped), for: .touchUpInside)
    }

    button.backgroundColor = .clear
    button.layer.cornerRadius = 15.0
    return button
}()

Answer 1

我已经重新实现了你的播放器类。现在您不需要为录制和播放状态创建两个单独的 View 。您只需更改 isRecorder 值，您的按钮标题就会更改，而无需创建另一个 View 。

class AudioPlayerView: UIView {
    var isRecorder = false {
        didSet {
            if isRecorder {
                theButton.setTitle("▷", for: .normal)
            } else {
                theButton.setTitle("▢", for: .normal)
            }
        }
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        if isRecorder {
            theButton.setTitle("▷", for: .normal)
        } else {
            theButton.setTitle("▢", for: .normal)
        }
        //Add your button to view as subview.
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

    }
    let theButton: UIButton = {
        let button = UIButton()
        button.backgroundColor = .clear
        button.layer.cornerRadius = 15.0
        button.addTarget(self, action: #selector(tapButton), for: .touchUpInside)
        return button
    }()

    func tapButton() {
        if isRecorder {
            playPauseAudio()
        } else {
            recordTapped()
        }
    }
    func playPauseAudio() {

    }
    func recordTapped() {

    }
}