如何使用 Swift 3 在 BWWalkthrough View Controller 中添加标签?

How to add Label in BWWalkthrough View Controller with Swift 3?

我在我的应用程序中使用 BWWalkthrough 库 作为幻灯片图像。我 在每张幻灯片中添加标题和消息标签



我想翻译到每个标签。
因此,我将标签拖到 IBOutlet 并在 ViewDidLoad 中添加 NStranslation 文本。
但是,当我 运行 代码时,出现致命错误。
这是我的代码。
BWWalkthroughPageViewController.swift ,

  @IBOutlet weak var lblTitle1: UILabel!


override open func viewDidLoad() {
    super.viewDidLoad()
    lblTitle1.text = NSLocalizedString("Date:", comment: "")

    self.view.layer.masksToBounds = true

    subviewsSpeed = Array()

    for v in view.subviews{
        speed.x += speedVariance.x
        speed.y += speedVariance.y
        if !notAnimatableViews.contains(v.tag) {
            subviewsSpeed.append(speed)
        }
    }
}


我在以下代码 (BWWalkthroughViewController.swift) 中出错。

viewController.view.translatesAutoresizingMaskIntoConstraints = false

lblTitle1.text = NSLocalizedString("Date:", 评论: "")

有人能帮帮我吗?

执行如下操作,将在所有页面中添加一个标签,您可以像这样添加更多标签。

override open func viewDidLoad() {
    super.viewDidLoad()
    self.view.layer.masksToBounds = true

    let sampleLabel:UILabel = UILabel()
    sampleLabel.frame = CGRect(x: 100, y: 100, width: 200, height: 200)
    sampleLabel.textAlignment = .center
    sampleLabel.text = "Hello this is iOS dev"
    sampleLabel.numberOfLines = 1
    sampleLabel.textColor = .red
    sampleLabel.font=UIFont.systemFont(ofSize: 22)
    sampleLabel.backgroundColor = .yellow

    view.addSubview(sampleLabel)
    sampleLabel.translatesAutoresizingMaskIntoConstraints = false
    sampleLabel.heightAnchor.constraint(equalToConstant: 200).isActive = true
    sampleLabel.widthAnchor.constraint(equalToConstant: 200).isActive = true
    sampleLabel.centerXAnchor.constraint(equalTo: sampleLabel.superview!.centerXAnchor).isActive = true
    sampleLabel.centerYAnchor.constraint(equalTo: sampleLabel.superview!.centerYAnchor).isActive = true

    subviewsSpeed = Array()

    for v in view.subviews{
        speed.x += speedVariance.x
        speed.y += speedVariance.y
        if !notAnimatableViews.contains(v.tag) {
            subviewsSpeed.append(speed)
        }
    }
}

更新

您可以通过安全解包来防止崩溃的发生lblTitle1 检查下面。

override open func viewDidLoad() {
    super.viewDidLoad()

    if (lblTitle1) != nil {
        lblTitle1.text = NSLocalizedString("Date:", comment: "")
    }

    self.view.layer.masksToBounds = true

    subviewsSpeed = Array()

    for v in view.subviews{
        speed.x += speedVariance.x
        speed.y += speedVariance.y
        if !notAnimatableViews.contains(v.tag) {
            subviewsSpeed.append(speed)
        }
    }
}