Clicked button move to scrollView in swift - ios

Question

I have some question.
When i clicked button, how to move scroll View for next scroll page.
I made storyboard .
enter image description here
I have two direction button.
This is my code(This code not include two button)
import UIKit
class ScrollDetailVC: UIViewController, UIScrollViewDelegate {
let DetailScroll1 = ["image":"1"]
let DetailScroll2 = ["image":"2"]
let DetailScroll3 = ["image":"3"]
var DetailScrollArray = [Dictionary<String,String>]()
#IBOutlet weak var DetailScrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
DetailImageView()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
scrollView.contentOffset.y = 0
}
func DetailImageView() {
DetailScrollArray = [DetailScroll1,DetailScroll2,DetailScroll3]
DetailScrollView.isPagingEnabled = true
DetailScrollView.contentSize = CGSize(width: self.view.bounds.width * CGFloat(DetailScrollArray.count), height : self.view.bounds.height)
DetailScrollView.showsHorizontalScrollIndicator = false
DetailScrollView.showsVerticalScrollIndicator = false
//firstScroll.alwaysBounceVertical = true
DetailScrollView.delegate = self
for (index,Scroll) in DetailScrollArray.enumerated() {
if let scrollView = Bundle.main.loadNibNamed("Scroll", owner: self, options: nil)?.first as? scrollView {
scrollView.Scrollimg.image = UIImage(named: Scroll["image"]!)
scrollView.Scrollimg.contentMode = .scaleAspectFill
DetailScrollView.addSubview(scrollView)
scrollView.frame.size.width = self.DetailScrollView.bounds.size.width
scrollView.frame.size.height = self.DetailScrollView.bounds.size.height
//scrollView.imageView?.contentMode = UIViewContentMode.scaleAspectFill
scrollView.frame.origin.x = CGFloat(index) * self.view.bounds.size.width
//scrollView.contentMode = UIViewContentMode.scaleAspectFill
}
}
}
I want change scroll View image.
Thanks.

Answer 1

Change your scrollView's contentSize in your Button's Tap events (e.g. TouchUpInside).
Try the following tap handler.
leftButton.addTarget(self, action: #selector(leftButtonTapped), for: .touchUpInside)
rightButton.addTarget(self, action: #selector(rightButtonTapped), for: .touchUpInside) // add those two lines right after buttons' initialization.
func leftButtonTapped() {
if DetailScrollView.contentOffset.x > 0 {
DetailScrollView.contentOffset.x -= self.view.bounds.width
}
}
func rightButtonTapped() {
if DetailScrollView.contentOffset.x < self.view.bounds.width * CGFloat(DetailScrollArray.count-2) {
DetailScrollView.contentOffset.x += self.view.bounds.width
}
}

Answer 2

// Swift 5.0
func scrollLeft() {
if scrollView.contentOffset.x > self.view.bounds.width {
scrollView.contentOffset.x -= self.view.bounds.width
var frame: CGRect = self.scrollView.frame
frame.origin.x = scrollView.contentOffset.x
frame.origin.y = 0
self.scrollView.setContentOffset(CGPoint(x: frame.origin.x, y: frame.origin.y), animated: true)
}
}
func scrollRight() {
print(scrollView.contentOffset.x)
if scrollView.contentOffset.x < self.view.bounds.width * CGFloat(catItems.count - 1) {
scrollView.contentOffset.x += self.view.bounds.width
}
}