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

Question

I use BWWalkthrough library for slides images in my app. I add Title and Message labels in each slide.
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)
}
}
}
I got error in these following codes (BWWalkthroughViewController.swift).
viewController.view.translatesAutoresizingMaskIntoConstraints = false
and lblTitle1.text = NSLocalizedString("Date:", comment: "")
Could anyone help me please?

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)
}
}
}