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

Question

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

Answer 1

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)
        }
    }
}

Update

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)
        }
    }
}