ScrollView删除基于位置的图像

Question

我做了一个滚动视图，并制作了一个图像数组（我将稍后添加一个选项，用户将图像发布到该数组中，朋友图像将填充到该数组中）以及希望让用户能够看到照片并跟踪它。

我已经创建了一个for循环，将照片添加到数组中，但是当我创建一个if语句来取出数组中的项目时，出现错误，因为我会从数组中删除图像[i]而且我知道为什么会发生这种情况，但是想要解决这个问题。所以基本上我需要在数组中取出图像。
请帮我解决我还在学习。

class ViewController: UIViewController { 

var imageArray = [UIImage]() 

@IBOutlet weak var mainScrollView: UIScrollView! 

override func viewDidLoad() { 
    super.viewDidLoad() 
    mainScrollView.frame = view.frame 
    imageArray = [#imageLiteral(resourceName: "dubai6"), #imageLiteral(resourceName: "dubai2"), #imageLiteral(resourceName: "dubai7"), #imageLiteral(resourceName: "dubai4"), #imageLiteral(resourceName: "dubai3"), #imageLiteral(resourceName: "dubai5"), #imageLiteral(resourceName: "DigitalDrawingPreview"), #imageLiteral(resourceName: "denarus"), #imageLiteral(resourceName: "dubai1")] 
    for i in 0..<imageArray.count { 
     let imageView = UIImageView() 
     imageView.contentMode = .scaleAspectFit 
     imageView.image = imageArray[i] 
     let xPosition = self.view.frame.width * CGFloat(i) 
     imageView.frame = CGRect(x: xPosition, y: 0, width: self.view.frame.width, height: self.mainScrollView.frame.height) 

     mainScrollView.contentSize.width = mainScrollView.frame.width * CGFloat(i + 1) 
     mainScrollView.addSubview(imageView) 
    } 
    for i in 0..<imageArray.count { 
     if (i >= 2) { 
      imageArray.remove(at: (i - 2)) 
     } 
    } 

    // Do any additional setup after loading the view, typically from a nib. 
} 

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

谢谢老乡们，更好的程序员。

Answer 1

你不能从一个阵列，同时在穿越它，所以你必须使用一个临时的阵列上

class ViewController: UIViewController { 

var imageArray = [UIImage]() 

@IBOutlet weak var mainScrollView: UIScrollView! 

override func viewDidLoad() { 
    super.viewDidLoad() 
    mainScrollView.frame = view.frame 
    imageArray = [#imageLiteral(resourceName: "dubai6"), #imageLiteral(resourceName: "dubai2"), #imageLiteral(resourceName: "dubai7"), #imageLiteral(resourceName: "dubai4"), #imageLiteral(resourceName: "dubai3"), #imageLiteral(resourceName: "dubai5"), #imageLiteral(resourceName: "DigitalDrawingPreview"), #imageLiteral(resourceName: "denarus"), #imageLiteral(resourceName: "dubai1")] 
    for i in 0..<imageArray.count { 
     let imageView = UIImageView() 
     imageView.contentMode = .scaleAspectFit 
     imageView.image = imageArray[i] 
     let xPosition = self.view.frame.width * CGFloat(i) 
     imageView.frame = CGRect(x: xPosition, y: 0, width: self.view.frame.width, height: self.mainScrollView.frame.height) 

     mainScrollView.contentSize.width = mainScrollView.frame.width * CGFloat(i + 1) 
     mainScrollView.addSubview(imageView) 


    } 
    let tempArr = imageArray 
    for i in 0..<tempArr.count { 
     if (i >= 2) { // Breakpoint here 
      imageArray.remove(at: (i - 2)) 
     } 

    } 

    // Do any additional setup after loading the view, typically from a nib. 
} 



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

使用步骤要经过for循环的每一行，直到它崩溃删除元素，然后打印我当时的价值，通过悬停光标在它或键入命令在控制台po i并输入