ios - 单击按钮快速移动到 scrollView

Question

我有一些问题。

当我点击按钮时，如何将 ScrollView 移动到下一个滚动页面。

我制作了 Storyboard。

enter image description here

我有两个方向按钮。

这是我的代码(此代码不包括两个按钮)

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
        }
    }
}

我想要更改滚动查看图像。谢谢。

Answer 1

在 Button 的 Tap 事件(例如 TouchUpInside)中更改 scrollView 的 contentSize。
尝试以下点击处理程序。

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 
         }
    }