如何使用Swift 3在BWWalkthrough View Controller中添加Label？ [英] How to add Label in BWWalkthrough View Controller with Swift 3?

问题描述

我在我的应用中为幻灯片图片使用 BWWalkthrough library 。我在每张幻灯片中 添加标题和消息标签 。

I use BWWalkthrough library for slides images in my app. I add Title and Message labels in each slide.

我想翻译每个标签。


所以，我将标签拖到 IBOutlet ，然后在 ViewDidLoad 。

但是，当我运行代码时，我遇到了致命的错误。
这是我的代码。

BWWalkthroughPageViewController.swift ，

I would like to translate to each labels.
So, I drag the label to IBOutlet and I add NStranslation text in ViewDidLoad.
But, when I run the code, I got fatal error.
Here is my code.
In 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)
        }
    }
}

我在以下代码中遇到错误（BWWalkthroughViewController。 SWIFT）即可。

viewController.view.translatesAutoresizingMaskIntoConstraints = false

和 lblTitle1.text = NSLocalizedString（日期：，评论：）

有人可以帮我吗？

推荐答案

执行以下操作，在所有页面中添加一个标签，你可以用同样的方式添加更多标签。

Do something like below, that will add one label in all page, you can add more label like same way.

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 lblTitle1 检查下面。

You can prevent crash to happening by safe unwrapping lblTitle1 check below.

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)
        }
    }
}

这篇关于如何使用Swift 3在BWWalkthrough View Controller中添加Label？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！