Arrays 如何查看图像阵列中的下一个图像？

在这个函数中，我需要更改图像视图的图像，将其移动到数组中的下一个图像上

private func updateImage(index: Int) {
    for x in 0..<urlArray.count
    {
        let imageUrl:URL = URL(string: "\(urlArray.object(at: x) as! String)")!
        let request:URLRequest = URLRequest.init(url: imageUrl)
        NSURLConnection.sendAsynchronousRequest(request, queue: OperationQueue.main, completionHandler: { (response, imageDta, error) in
            if (error == nil)
            {
                self.imagesArray.add(UIImage(data: imageDta!)!)
                if self.imagesArray.count > 0
                {
                    self.iv.image = self.imagesArray.object(at: 0) as! UIImage
                }
            }else{
                print("ERROR - \(error!)")
            }
        })
    }

}

更新：我尝试将Charly Pico建议的代码添加到我的函数中，但它似乎没有移动到数组中的下一个图像，我认为这与调用它的方式有关。我将详细介绍我的文件是如何构造和工作的，希望澄清我希望如何使用更改图像代码

var urlArray:NSMutableArray! = NSMutableArray()
var imagesArray:NSMutableArray! = NSMutableArray()

这些包含URL和图像的数组不属于任何函数

func GetTheStories() {
    let ref = FIRDatabase.database().reference().child("Content")
    ref.observe(FIRDataEventType.value, with: {(snapshot) in
        self.fileArray.removeAll()
        if snapshot.childrenCount>0{
            for content in snapshot.children.allObjects as![FIRDataSnapshot]{
                let contentInfo = content.value as? [String: String]
                let contentType = contentInfo?["contentType"]
                let storyLink = contentInfo?["pathToImage"]
                let content = storyLink   
                self.urlArray = NSMutableArray.init(array:[storyLink])                    
            }   
        }  
    })
}

这是我调用的函数，用于将来自Firebase服务器的URL附加到URLSARRAY

override func viewDidAppear(_ animated: Bool) {

    for x in 0..<urlArray.count
    {
        let imageUrl:URL = URL(string: "\(urlArray.object(at: x) as! String)")!
        let request:URLRequest = URLRequest.init(url: imageUrl)
        NSURLConnection.sendAsynchronousRequest(request, queue: OperationQueue.main, completionHandler: { (response, imageDta, error) in
            if (error == nil)
            {
                self.imagesArray.add(UIImage(data: imageDta!)!)
                if self.imagesArray.count > 0
                {
                    self.iv.image = self.imagesArray.object(at: 0) as! UIImage
                }
            }else{
                print("ERROR - \(error!)")
            }
        })
    }
}

这里调用它来更新图像。当分段进度条更改为下一个进度条时，将调用此函数

func segmentedProgressBarChangedIndex(index: Int) {
    print("Now showing index: \(index)")
    updateImage(index: index)
}

---

我知道为什么我不使用按钮和动作有点让人困惑，这主要是因为我试图创建一个Instagram风格的故事，其中的片段在完成或点击屏幕时，会将图像更改为阵列中的下一个。我知道有很多东西要看，但我想这将解释我想如何更详细地使用图像数组

更改行以使用传递到函数中的索引，如下所示

self.iv.image = self.imagesArray.object(at: index) as! UIImage

---

这个函数试图一次完成很多事情，所以很难说如何让它完成你想要的，但是，你有一个索引参数。在此处使用该值而不是0：

  if self.imagesArray.count > index
  {
        self.iv.image = self.imagesArray.object(at: index) as! UIImage
  }

将等待加载该图像，然后将其设置为视图

---

注意：您需要检查索引是否在范围内，因此，假设您的

imagesArray

包含2个图像，我建议您执行以下操作：

//Create a @IBAction and attach it to a UIButton in your Storyboard as a touchUpInside action.
@IBAction func changeImage()
{
   //Set a variable with Int as 0.
   var imageToPresent = 0

   //Create a for to check image by image inside the array.
   for x in 0..<imagesArray.count
   {

      //Compare the image at self.iv with the image in imagesArray at index x. And if the images are the same add a + 1 to imageToPresent.
      if self.iv.image == imagesArray.object(at: x) as! UIImage
      {
         imageToPresent = x + 1

         //Check if imageToPresent isn't bigger or equal than imagesArray, otherwise we will get an error and the App will crash.
         if imageToPresent >= imagesArray.count
         {

            //If imageToPreset if bigger or equal to imagesArray.count, it means that there are no more images at a higher index, so we return imageToPresent to 0.
            imageToPresent = 0
         }
      }
   }

   //Set the new image of imagesArray at index imageToPresent as UIImage to self.iv.
   self.iv.image = imagesArray.object(at: imageToPresent) as! UIImage
}

首先，将您的URLARY更新为：

urlArray = NSMutableArray.init(array: ["https://firebasestorage.googleapis.com/v0/b/motive-73352.appspot.com/o/Content%2F20170525130622.jpg?alt=media&token=1e654c60-2f47-43c3-9298-b0282d27f66c","https://www.videomaker.com/sites/videomaker.com/files/styles/magazine_article_primary/public/articles/18984/363%20C03%20Lighting%20primary.png"])

---

因此，您至少有2张图像可以进行图像旋转。

明天我将对此进行拍摄，谢谢您的帮助！我曾尝试将此代码添加到updateImage函数中，但它似乎不太起作用。我将发布一个更新，更详细地展示代码是如何工作的。有什么建议吗？很抱歉，暂时没有回答，我很忙。为什么要使用分段进度条？没问题，我正在尝试使用从数据库中提取的内容创建自己的Instagram故事版本。这主要是为了一个原型来演示我最终想要实现的功能

  if self.imagesArray.count > index
  {
        self.iv.image = self.imagesArray.object(at: index) as! UIImage
  }

//Create a @IBAction and attach it to a UIButton in your Storyboard as a touchUpInside action.
@IBAction func changeImage()
{
   //Set a variable with Int as 0.
   var imageToPresent = 0

   //Create a for to check image by image inside the array.
   for x in 0..<imagesArray.count
   {

      //Compare the image at self.iv with the image in imagesArray at index x. And if the images are the same add a + 1 to imageToPresent.
      if self.iv.image == imagesArray.object(at: x) as! UIImage
      {
         imageToPresent = x + 1

         //Check if imageToPresent isn't bigger or equal than imagesArray, otherwise we will get an error and the App will crash.
         if imageToPresent >= imagesArray.count
         {

            //If imageToPreset if bigger or equal to imagesArray.count, it means that there are no more images at a higher index, so we return imageToPresent to 0.
            imageToPresent = 0
         }
      }
   }

   //Set the new image of imagesArray at index imageToPresent as UIImage to self.iv.
   self.iv.image = imagesArray.object(at: imageToPresent) as! UIImage
}

Timer.scheduledTimer(withTimeInterval: 3.0, repeats: true) { (timer) in
        self.changeImage()
    }

urlArray = NSMutableArray.init(array: ["https://firebasestorage.googleapis.com/v0/b/motive-73352.appspot.com/o/Content%2F20170525130622.jpg?alt=media&token=1e654c60-2f47-43c3-9298-b0282d27f66c","https://www.videomaker.com/sites/videomaker.com/files/styles/magazine_article_primary/public/articles/18984/363%20C03%20Lighting%20primary.png"])