Ios “如何调试”；线程1：致命错误：Swift中的索引超出范围；

我对Swift代码有问题：

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {


    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.textLabel?.backgroundColor = UIColor.clear
    cell.detailTextLabel?.backgroundColor = UIColor.clear

    if indexPath.row % 2 == 0 {
        cell.backgroundColor = UIColor(white: 1, alpha: 0.1)
    } else {
        cell.backgroundColor = UIColor(white: 1, alpha: 0.2)
    }

    // Load feed iamge.
    let url = NSURL(string:feedImgs[indexPath.row] as! String) //** The problem - Thread 1: Fatal error: Index out of range**
    let data = NSData(contentsOf:url! as URL)
    var image = UIImage(data:data! as Data)
    image = resizeImage(image: image!, toTheSize: CGSize(width: 80, height: 80))
    let cellImageLayer: CALayer?  = cell.imageView?.layer
    cellImageLayer!.cornerRadius = 35
    cellImageLayer!.masksToBounds = true
    cell.imageView?.image = image
    cell.textLabel?.text = (myFeed.object(at: indexPath.row) as AnyObject).object(forKey: "title") as? String
    cell.textLabel?.textColor = UIColor.white
    cell.textLabel?.numberOfLines = 0
    cell.textLabel?.lineBreakMode = .byWordWrapping

    cell.detailTextLabel?.text = (myFeed.object(at: indexPath.row) as AnyObject).object(forKey: "pubDate") as? String
    cell.detailTextLabel?.textColor = UIColor.white

    return cell
}

---

如何解决这个问题？

您在

cellForRowAt indexPath

方法中访问两个数组，第一个是

feedImgs

，第二个是

myFeed

如果两个数组计数相同，则不会崩溃；如果两个数组计数不同，则其中一个数组的索引超出范围将崩溃

例如，

feedImgs

中有4个对象和

myFeed

中有5个对象，然后它将在

feedImgs

数组中的第4个索引处崩溃，并给出

索引超出范围的原因

希望这对您有所帮助。
索引超出范围意味着您需要从索引大于数组项的数组中获取索引

所以你在三个地方使用索引检查它们

let url = NSURL(string:feedImgs[indexPath.row] as! String)

,

及

因此，为了避免此问题在if条件下，Make是安全的

(if indexPath.row <  feedImgs.count{
  let url = NSURL(string:feedImgs[indexPath.row] as! String)
}

 (if indexPath.row <  myFeed.count){
    cell.detailTextLabel?.text = (myFeed.object(at: indexPath.row) as AnyObject).object(forKey: "pubDate") as? String

cell.textLabel?.text = (myFeed.object(at: indexPath.row) as AnyObject).object(forKey: "title") as? String

  }

（如果indexPath.row
检查myFeed和feedImgs数组计数，两者必须相同。如果说“feedImgs”数组的计数小于indexPath.row，您应该调试feedImgs数组。检查
feedImgs
数组中的元素数。您可以建议使用一个数组的解决方案吗？
cell.detailTextLabel?.text = (myFeed.object(at: indexPath.row) as AnyObject).object(forKey: "pubDate") as? String

(if indexPath.row <  feedImgs.count{
  let url = NSURL(string:feedImgs[indexPath.row] as! String)
}

 (if indexPath.row <  myFeed.count){
    cell.detailTextLabel?.text = (myFeed.object(at: indexPath.row) as AnyObject).object(forKey: "pubDate") as? String

cell.textLabel?.text = (myFeed.object(at: indexPath.row) as AnyObject).object(forKey: "title") as? String

  }