图片幻灯片Swift ios

Question

我是ios开发的新手。我正在尝试制作一个简单的全屏图像幻灯片。在向左滑动时，幻灯片显示应显示下一个图像，向右滑动幻灯片应显示上一个图像。

我有它工作，但是，如果我快速连续滑动，我得到一个空白的屏幕，几乎就像动画没有跟上，然后当我等待片刻并再次滑动图像视图速度到位并再次正常工作。知道我做错了什么吗？在使用动态数量的图像实现这样的图像轮播时，最佳做法是什么（这里它们是硬编码的）？

import UIKit

var imageArr = ["imageOne.jpg", "imageTwo.jpg", "imageThree.jpg", "imageFour.jpg", "imageFive.jpg"]
var imageIndex = 0;

class ViewController: UIViewController {

    var currImage = UIImageView()
    var rightImage = UIImageView()
    var leftImage = UIImageView()

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

        var bounds:CGRect = UIScreen.mainScreen().bounds
        var width:CGFloat = bounds.size.width
        var height:CGFloat = bounds.size.height


        currImage.frame = CGRect(x: 0.0, y: 0.0, width: width, height: height)
        currImage.image = UIImage(named: imageArr[imageIndex])

        rightImage.frame = CGRect(x: width, y: 0.0, width: width, height: height)
        rightImage.image = UIImage(named: imageArr[imageIndex + 1])

        leftImage.frame = CGRect(x: -width, y: 0.0, width: width, height: height)
        leftImage.image = UIImage(named: imageArr[imageArr.count - 1])

        self.view.addSubview(currImage)
        self.view.addSubview(rightImage)
        self.view.addSubview(leftImage)

        var swipeLeft = UISwipeGestureRecognizer(target: self, action: "handleSwipe:")
        swipeLeft.direction = UISwipeGestureRecognizerDirection.Left
        self.view.addGestureRecognizer(swipeLeft)

        var swipeRight = UISwipeGestureRecognizer(target: self, action: "handleSwipe:")
        swipeRight.direction = UISwipeGestureRecognizerDirection.Right
        self.view.addGestureRecognizer(swipeRight)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.

    }

    let transitionManager = TransitionManager()


    func handleSwipe(gesture: UIGestureRecognizer) {

        var bounds:CGRect = UIScreen.mainScreen().bounds
        var width:CGFloat = bounds.size.width
        var height:CGFloat = bounds.size.height

        if let swipeGesture = gesture as? UISwipeGestureRecognizer {

            if (swipeGesture.direction == UISwipeGestureRecognizerDirection.Left ) {

                UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.2, options: UIViewAnimationOptions.CurveEaseIn, animations: {


                    self.currImage.frame = CGRect(x: -width, y: 0.0, width: width, height: height)
                    self.rightImage.frame = CGRect(x: 0.0, y:0.0, width: width, height: height)

                    }, completion: { finished in

                        if (!finished) { return }

                        imageIndex++
                        imageIndex = imageIndex <= imageArr.count-1 ? imageIndex : 0

                        var leftIndex = imageIndex - 1 < 0 ? imageArr.count - 1 : imageIndex - 1

                        self.leftImage.image = UIImage(named: imageArr[leftIndex])
                        self.leftImage.frame = CGRect(x: -width, y: 0.0, width: width, height: height)

                        var tempImg = self.currImage

                        self.currImage = self.rightImage

                        self.rightImage = tempImg

                        self.rightImage.frame = CGRect(x: width, y: 0.0, width: width, height: height)

                        var rightIndex = imageIndex + 1 > imageArr.count - 1 ? 0 : imageIndex + 1
                        self.rightImage.image = UIImage(named: imageArr[rightIndex])

                })
            }

            if (swipeGesture.direction == UISwipeGestureRecognizerDirection.Right) {


                UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.2, options: UIViewAnimationOptions.CurveEaseIn, animations: {

                    self.currImage.frame = CGRect(x: width, y: 0.0, width: width, height: height)
                    self.leftImage.frame = CGRect(x: 0.0, y: 0.0, width: width, height: height)

                    }, completion: { finished in


                        imageIndex--
                        imageIndex = imageIndex < 0 ? imageArr.count - 1 : imageIndex

                        var rightIndex = imageIndex + 1 > imageArr.count - 1 ? 0 : imageIndex + 1

                        self.rightImage.image = UIImage(named: imageArr[rightIndex])
                        self.rightImage.frame = CGRect(x: width, y: 0.0, width: width, height: height)

                        var tempImg = self.currImage

                        self.currImage = self.tempImg
                        self.leftImage = tempCurr

                        self.leftImage.frame = CGRect(x: -width, y: 0.0, width: width, height: height)
                        var leftIndex = imageIndex - 1 < 0 ? imageArr.count - 1 : imageIndex - 1
                        self.leftImage.image = UIImage(named: imageArr[leftIndex])

                })
            }

        }
    }

} 

非常感谢任何帮助！

Answer 1

@IBOutlet weak var imageView：UIImageView！

var i=Int()

  override func viewDidLoad() {
        super.viewDidLoad()
        Timer.scheduledTimer(timeInterval: 3.0, target: self, selector: #selector(imageChange), userInfo: nil, repeats: true)
        // Do any additional setup after loading the view.
    }

    @objc func imageChange(){
        self.imageView.image=images[i]
        if i<images.count-1{
            i+=1
        }
        else{
            i=0
        }
    }

Answer 2

我已经为轮播幻灯片尝试了 CollectionView，但它对我不起作用。我不喜欢我必须做的让它在一行中显示图像的黑客方式，我也不喜欢它无法返回活动图像的事实（这里也有一些解决方法，但他们没有看起来很可靠）。因此，很自然地，我最终为我的目的构建了一个自定义幻灯片轮播。我将在这里分享代码，希望它可以帮助（或至少指导某人）解决类似问题。

注意：我的轮播是全宽、singleImagePerScreen 轮播，带有滑动识别器来滑动图像和在图像处于活动状态时触发的委托功能（我用它来显示活动图像 - “1 of 5”）。< /p>

已测试：SWIFT 5、XCode 12.2、iOS 14.2

// ImageCarouselView class

import UIKit

class ImageCarouselView: UIView {
    private let images: [UIImage?]
    private var index = 0
    private let screenWidth = UIScreen.main.bounds.width

    var delegate: ImageCarouselViewDelegate?

    lazy var previousImageView = imageView(image: nil, contentMode: .scaleAspectFit)
    lazy var currentImageView = imageView(image: nil, contentMode: .scaleAspectFit)
    lazy var nextImageView = imageView(image: nil, contentMode: .scaleAspectFit)

    lazy var previousImageLeadingConstraint: NSLayoutConstraint = {
        return previousImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: -screenWidth)
    }()

    lazy var currentImageLeadingConstraint: NSLayoutConstraint = {
        return currentImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0)
    }()

    lazy var nextImageLeadingConstraint: NSLayoutConstraint = {
        return nextImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: screenWidth)
    }()

    init(_ images: [UIImage?]) {
        self.images = images

        super.init(frame: .zero)

        self.translatesAutoresizingMaskIntoConstraints = false

        setupLayout()
        setupImages()
        setupSwipeRecognizer()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setupLayout() {
        self.subviews.forEach({ $0.removeFromSuperview() })

        addSubview(previousImageView)
        addSubview(currentImageView)
        addSubview(nextImageView)

        previousImageLeadingConstraint = previousImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: -screenWidth)
        currentImageLeadingConstraint = currentImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0)
        nextImageLeadingConstraint = nextImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: screenWidth)

        NSLayoutConstraint.activate([
            previousImageLeadingConstraint,
            previousImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
            previousImageView.widthAnchor.constraint(equalToConstant: screenWidth),

            currentImageLeadingConstraint,
            currentImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
            currentImageView.widthAnchor.constraint(equalToConstant: screenWidth),

            nextImageLeadingConstraint,
            nextImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
            nextImageView.widthAnchor.constraint(equalToConstant: screenWidth),
        ])
    }

    private func setupImages() {
        currentImageView.image = images[self.index]

        guard images.count > 1 else { return }

        if (index == 0) {
            previousImageView.image = images[images.count - 1]
            nextImageView.image = images[index + 1]
        }

        if (index == (images.count - 1)) {
            previousImageView.image = images[index - 1]
            nextImageView.image = images[0]
        }
    }

    private func setupSwipeRecognizer() {
        guard images.count > 1 else { return }

        let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes))
        let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes))

        leftSwipe.direction = .left
        rightSwipe.direction = .right

        self.addGestureRecognizer(leftSwipe)
        self.addGestureRecognizer(rightSwipe)
    }

    @objc private func handleSwipes(_ sender: UISwipeGestureRecognizer) {
        if (sender.direction == .left) {
            showNextImage()
        }

        if (sender.direction == .right) {
            showPreviousImage()
        }
    }

    private func showPreviousImage() {
        previousImageLeadingConstraint.constant = 0
        currentImageLeadingConstraint.constant = screenWidth

        UIView.animate(withDuration: 0.2, delay: 0.0, options: .curveEaseIn, animations: {
            self.layoutIfNeeded()
        }, completion: { _ in
            self.nextImageView = self.currentImageView
            self.currentImageView = self.previousImageView
            self.previousImageView = self.imageView(image: nil, contentMode: .scaleAspectFit)

            self.index = self.index == 0 ? self.images.count - 1 : self.index - 1
            self.delegate?.imageCarouselView(self, didShowImageAt: self.index)
            self.previousImageView.image = self.index == 0 ? self.images[self.images.count - 1] : self.images[self.index - 1]

            self.setupLayout()
        })
    }

    private func showNextImage() {
        nextImageLeadingConstraint.constant = 0
        currentImageLeadingConstraint.constant = -screenWidth

        UIView.animate(withDuration: 0.2, delay: 0.0, options: .curveEaseIn, animations: {
            self.layoutIfNeeded()
        }, completion: { _ in
            self.previousImageView = self.currentImageView
            self.currentImageView = self.nextImageView
            self.nextImageView = self.imageView(image: nil, contentMode: .scaleAspectFit)

            self.index = self.index == (self.images.count - 1) ? 0 : self.index + 1
            self.delegate?.imageCarouselView(self, didShowImageAt: self.index)
            self.nextImageView.image = self.index == (self.images.count - 1) ? self.images[0] : self.images[self.index + 1]

            self.setupLayout()
        })
    }

    func imageView(image: UIImage? = nil, contentMode: UIImageView.ContentMode) -> UIImageView {
        let view = UIImageView()

        view.image = image
        view.contentMode = contentMode
        view.translatesAutoresizingMaskIntoConstraints = false

        return view
    }
}

// ImageCarouselViewDelegate

import UIKit

protocol ImageCarouselViewDelegate: NSObjectProtocol {
    func imageCarouselView(_ imageCarouselView: ImageCarouselView, didShowImageAt index: Int)
}

// Usage

let slideshowView = ImageCarouselView(images) // initialize

self.slideshowView.delegate = self // set delegate in viewDidLoad()

extension YourViewController: ImageCarouselViewDelegate {
    func imageCarouselView(_ imageCarouselView: ImageCarouselView, didShowImageAt index: Int) {
        // do something with index
    }
}

Answer 3

这是很多代码，我不太确定这是最好的方法。您是否尝试使用集合视图控制器？它的工作方式几乎与表视图一样，您将从每个单元格中为您的数组分配一个图像。 Ps我也是iOS新手，但我100％肯定你应该在这样的情况下使用集合视图对象

Answer 4

您可以添加收藏夹视图，在自定义的收藏夹视图单元格中添加图像，然后在道具视图的收藏夹面板上进行选中 Paging Enabled。使用计时器进行自动滑动