在表格視圖中設置單元格時超出范圍

Question

在表格視圖中設置單元格時，出現了以下問題：

日志：

*由於未捕獲的異常'NSRangeException'而終止應用程序，原因：'* -[__ NSArrayM objectAtIndex：]：索引5超出范圍[0 .. 4]'***首次拋出調用堆棧：（0x18696afd8 0x1853cc538 0x1868491f0 0x100918a30 0x10091960c 0x18cddf114 0ca 0x18cde431c 0x18cb7c92c 0x18ca97158 0x189c87274 0x189c7bde8 0x189c7bca8 0x189bf7360 0x189c1e3c0 0x189c1ee8c 0x1869189a0 0x186916628 0x186846db4 0x1882b0074 0x18cAffy dy（有）x100caffunc）

internal func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    if (tableView == tableview) {
        let cell = tableView.dequeueReusableCell(withIdentifier: "table", for: indexPath as IndexPath) as! homeTableViewCell

        if (titlearray.count != 0) {
            let tit: NSString = self.titlearray[indexPath.row] as! NSString

            print("titlearraytitlearray\(titlearray)")

            appDelegate.trendseetitarray = titlearray

            print("appDelegatetrendseearray\(appDelegate.trendseetitarray)")

            cell.treadingtitle.text! = tit as String
        }

        if (pricearray.count != 0) {
            let tit: NSString = self.pricearray[indexPath.row] as! NSString

            appDelegate.trendseepricearray = pricearray

            cell.trendingprice.text! = tit as String
        }

        if (addressarraylist.count != 0) {
            let tit: NSString = self.addressarraylist[indexPath.row] as! NSString

            appDelegate.addressarraylist = addressarraylist
        }

        if (imagearray.count != 0 && imagearray.count != nil ) {
            print(imagearray)

            let roomurl=URL(string: "\(imagearray[indexPath.row])")
            //  print("Room URL:\(roomurl!)")
            appDelegate.trendseeimagearray = imagearray

            cell.Trendingimg.sd_setImage(
                with: roomurl,
                placeholderImage: UIImage(named:"no_image.png"),
                options: SDWebImageOptions.refreshCached,
                completed: { (image1: UIImage?, error1: Error?, cacheType1: SDImageCacheType, imageURL1: URL?) -> Void in
                }
            )

            cell.Trendingimg.clipsToBounds = true;
            cell.Trendingimg.sd_setImage(with: roomurl, completed: self.block1)
        }

        return cell
    }

    return UITableViewCell()
}

錯誤：

if (addressarraylist.count != 0) {
    let tit: NSString = self.addressarraylist[indexPath.row] as! NSString

    appDelegate.addressarraylist = addressarraylist
}

發行為圖片：

Answer 1

為什么要檢查Array的大小是否為非零，而不是測試計數是否至少等於indexPath.row ？ 嘗試以下方法：

// array index must be less than the count since the index is zero-based
if indexPath.row < addressarraylist.count {
  let tit: NSString = addressarraylist[indexPath.row] as! NSString
  appDelegate.addressarraylist = addressarraylist
}

您還應該在展開Optional值之前測試它們。 強制展開可能會導致運行時崩潰。 像這樣測試它們：

if let tit: NSString = addressarraylist[indexPath.row] as? NSString { ... }

Answer 2

您可以嘗試以下方法：

if self.addressarraylist.count > indexPath.row {
    let tit: NSString = self.addressarraylist[indexPath.row] as! NSString
    appDelegate.addressarraylist = addressarraylist
 }