ios - Firebase ImageView 数组

Question

在我的应用程序中，我使用自定义图像数组 View 。用户每个帖子上传的图像数量应该是以轮播方式显示的图像数量。

在 firebase 中，我有从 image 到 imageFive 的值

{
  "image" : "W585B.jpg",
  "imageFive" : "",
  "imageFour" : "",
  "imageThree" : "",
  "imageTwo" : "",
}

正如您在此示例中看到的，只有一个值包含字符串。用户可以发布一到五张图像。我想附加用户上传的许多图像并将其显示在轮播中。这就是我现在所拥有的。

    var imageArray = [UIImage]()

    override func viewDidLoad() {
            super.viewDidLoad()

           if let stringImage = self.imageNames {



        let imageRef = storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage)")

        imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
            if error == nil {


                self.ImageOne = UIImage(data: data!)!
                imageArray.append(self.ImageOne)

            }else {
                print("Error downloading image:" )
            }


            self.carouselView.reloadData()

            self.carouselView.type = .rotary



            if let stringImages = self.imagesTwo {

                let imageRefs = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImages)")

                imageRefs.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
                    if error == nil {

                        self.ImageTwo = UIImage(data: data!)!
                        imageArray.append(self.ImageTwo)


                    }else {
                        print("Error downloading image:" )
                    }
                    self.carouselView.reloadData()

                    self.carouselView.type = .rotary


                })}
            if let stringImage3 = self.imagesThree {

                let imageRef = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage3)")

                imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
                    if error == nil {

                        self.ImageThree = UIImage(data: data!)!
                        imageArray.append(self.ImageThree)


                    }else {
                        print("Error downloading image:" )
                    }

                    self.carouselView.reloadData()

                    self.carouselView.type = .rotary

                })}
            if let stringImage4 = self.imagesFour {

                let imageRef = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage4)")

                imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
                    if error == nil {

                        self.ImageFour = UIImage(data: data!)!
                        imageArray.append(self.ImageFour)


                    }else {
                        print("Error downloading image:" )
                    }

                    self.carouselView.reloadData()

                    self.carouselView.type = .rotary

                })}
            if let stringImage5 = self.imagesFive {
               // AppDelegate.instance().showActivityIndicator()
                let imageRef = self.storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/\(stringImage5)")

                imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
                    if error == nil {
                      //  AppDelegate.instance().dismissActivityIndicator()
                        self.ImageFive = UIImage(data: data!)!
                        imageArray.append(self.ImageFive)


                    }else {
                        print("Error downloading image:" )
                    }
                    self.carouselView.reloadData()

                    self.carouselView.type = .rotary


                })}

        })

    }

 func carousel(_ carousel: iCarousel, viewForItemAt index: Int, reusing view: UIView?) -> UIView {
        var imageView: UIImageView!

        if view == nil {
            imageView = UIImageView(frame: CGRect(x: 20, y: 0, width: 250, height: 270))
           // imageView.backgroundColor = UIColor.lightGray
            imageView.contentMode = .scaleAspectFit
            imageView.clipsToBounds = true
            carousel.clipsToBounds = true
        }else{
            imageView = view as! UIImageView

        }


        imageView.image = imageArray[index]
        imageArray.removeAll()

        return imageView


    }

现在，我必须单击单元格两次才能显示图像。当我单击该单元格一次时，它什么也不显示，但第二次单击时它会显示图像。同样，如果我单击另一个单元格，它会在第一次单击时显示前一个单元格的图像，然后在第二次单击时显示该单元格的图像。

此外，当我单击包含多个图像的单元格时，第一次单击时它什么也不显示，第二次单击时，应用程序崩溃并显示 fatal error :索引超出范围

Answer 1

我不确定，但你也可以尝试一下:

func carousel(_ carousel: iCarousel, viewForItemAt index: Int, reusing view: UIView?) -> UIView {
    var imageView = view as! UIImageView

    if view != nil {
        imageView = UIImageView(frame: CGRect(x: 20, y: 0, width: 250, height: 270))
       // imageView.backgroundColor = UIColor.lightGray
        imageView.contentMode = .scaleAspectFit
        imageView.clipsToBounds = true
        carousel.clipsToBounds = true

       imageView = view as! UIImageView
        imageView.image = imageArray[index]
        imageArray.removeAll() // are you sure about this line?
}
        return imageView
    }