Scroll view parallax effect - swift

Question

I made a program from one youtube channel and ran into a problem. I think that it is related to the layout. On different devices displayed differently. And can someone tell me how to fix what text will fit onto another one and how to make the image appear on the whole my CustomView.
import UIKit struct scrollViewDataStruct {
let title: String?
let image: UIImage?
} class ScrollController: UIViewController, UIScrollViewDelegate{
#IBOutlet weak var scrollView: UIScrollView!
var scrollViewData = [scrollViewDataStruct]()
var viewTagValue = 10
var tagValue = 100
override func viewDidLoad() {
super.viewDidLoad()
scrollView.delegate = self
scrollViewData = [scrollViewDataStruct.init(title: "There was written a very large line that climbs to another line", image: #imageLiteral(resourceName: "knowledge_graph_logo")),
scrollViewDataStruct.init(title: "Second", image: #imageLiteral(resourceName: "knowledge_graph_logo"))]
scrollView.contentSize.width = self.scrollView.frame.width * CGFloat(scrollViewData.count)
var i = 0
for data in scrollViewData {
let view = CustomView(frame: CGRect(x: 10 + (self.scrollView.frame.width * CGFloat(i)), y: 200, width: self.scrollView.frame.width - 75, height: self.scrollView.frame.height - 90))
view.imageView.image = data.image
view.tag = i + viewTagValue
self.scrollView.addSubview(view)
let label = UILabel(frame: CGRect.init(origin: CGPoint.init(x: 0, y: 20), size: CGSize.init(width: 0, height: 40)))
label.text = data.title
label.font = UIFont.boldSystemFont(ofSize: 30)
label.textColor = UIColor.black
label.sizeToFit()
label.tag = i + tagValue
if i == 0 {
label.center.x = view.center.x
} else {
label.center.x = view.center.x - self.scrollView.frame.width / 2
}
self.scrollView.addSubview(label)
i += 1
}
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if scrollView == scrollView {
for i in 0..<scrollViewData.count {
let label = scrollView.viewWithTag(i + tagValue) as! UILabel
let view = scrollView.viewWithTag(i + viewTagValue) as! CustomView
var scrollContentOffset = scrollView.contentOffset.x + self.scrollView.frame.width
var viewOffset = (view.center.x - scrollView.bounds.width / 4) - scrollContentOffset
label.center.x = scrollContentOffset - ((scrollView.bounds.width / 4 - viewOffset) / 2)
}
}
}}class CustomView: UIView {
let imageView: UIImageView = {
let imageView = UIImageView()
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.backgroundColor = UIColor.darkGray
imageView.contentMode = .scaleAspectFit
return imageView
}()
override init(frame: CGRect) {
super.init(frame: frame)
self.addSubview(imageView)
imageView.leftAnchor.constraint(equalTo: self.leftAnchor).isActive = true
imageView.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
imageView.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
imageView.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}}
This is a launch on iPhone 5s
This is a launch on iPhone 8 plus

Answer 1

What you should be doing is setting the width of each UILabel to the size of the CustomView that contains the image, and setting each label's "numberOfLines" to 0 and set the lineBreak to wordWrap. This should, in theory, let the labels only be the width of the images AND let the UILabels fit the size of the text vertically, rather than horizontally - which is what sizeToFit does.