我想为图像创建一个 CollectionView 像循环一样自动滚动

Posted 2023-02-23

【中文标题】我想为图像创建一个 CollectionView 像循环一样自动滚动

【英文标题】：i want create a CollectionView for images with auto scrolling like loop

【发布时间】：2019-03-16 11:28:55

【问题描述】：

我想使用 UICollectionView 自动滚动（如循环）创建图像集合。 这是我所做的。图片不应更改。

import UIKit

class ViewController: UIViewController,UICollectionViewDataSource,UICollectionViewDelegate 

    @IBOutlet weak var collectionView: UICollectionView!

    var scrollingTimer = Timer()
    var dataArray: [String] = ["image0","image1","image2"]

    override func viewDidLoad() 
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
        return dataArray.count
    

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! CustomCollectionViewCell

        cell.img.image = UIImage(named: dataArray[indexPath.row])

        var rowIndex = indexPath.row

        let numberOfRecords : Int = self.dataArray.count - 1

        if(rowIndex < numberOfRecords) 

            rowIndex = (rowIndex + 1)
        else
            rowIndex = 0
        

        scrollingTimer = Timer.scheduledTimer(timeInterval: 5.0, target: self, selector: #selector(ViewController.startTimer(theTimer:)), userInfo: rowIndex, repeats: true)

        return cell
    
    @objc func startTimer(theTimer : Timer) 

        UIView.animate(withDuration: 1.0, delay: 0, options: .curveLinear, animations: 
            self.collectionView.scrollToItem(at: IndexPath(row: theTimer.userInfo! as! Int , section:0), at: .centeredHorizontally, animated: false)
        , completion: nil)
    

【问题讨论】：

github.com/nicklockwood/iCarousel

【参考方案1】：

使用此代码。希望对您有所帮助。

Timer.scheduledTimer(timeInterval: 5, target: self, selector: #selector(moveToNextPage), userInfo: nil, repeats: true)

@objc func moveToNextPage ()
        if self.x < dataArray.count 
            let indexPath = IndexPath(item: x, section: 0)
            sliderPageCont.currentPage=x
            sliderColletion.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: true)
            self.x = self.x + 1
         else 
            self.x = 0