Question

无法投放类型＆＃39; Google_Books_1.BookTableViewCell＆＃39; （0x105557600）到＆＃39; NSIndexPath＆＃39; （0x1061cb438）

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("BookCell", forIndexPath: indexPath) as!BookTableViewCell
  ...
}


func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
        // let contact = ContactList![indexPath.row]
        performSegueWithIdentifier("BookDetailSegue", sender: indexPath)
    }
func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
        // let contact = ContactList![indexPath.row]
        performSegueWithIdentifier("BookDetailSegue", sender: indexPath)
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "BookDetailSegue" {
            let vc = segue.destinationViewController as! BookDetailViewController

            let indexPath = sender as! NSIndexPath
            vc.book = self.bookList[indexPath.row] **//error is here**
            vc.index = indexPath.row
        }
    }

如何处理此类错误？

Answer 1

声明实例变量

var indexPath: NSIndexPath?

然后将所选的indexPath分配给bellow：

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
            // let contact = ContactList![indexPath.row]
            self.indexPath = indexPath
            performSegueWithIdentifier("BookDetailSegue", sender: indexPath)
        }

现在像这样访问indexPath：

 override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
            if segue.identifier == "BookDetailSegue" {
                let vc = segue.destinationViewController as! BookDetailViewController

                vc.book = self.bookList[self.indexPath.row!] **//error is here**
                vc.index = indexPath.row
            }
        }

希望这对你有所帮助。

Answer 2

为什么不以您的tableView＆＃39; indexPathForSelectedRow属性为基础？

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "BookDetailSegue" {
        let vc = segue.destinationViewController as! BookDetailViewController
        if let indexPath =  tableView.indexPathForSelectedRow {
            vc.book = self.bookList[indexPath.row] **//error is here**
            vc.index = indexPath.row
        }
    }
}

无法将TableViewCell类型的值转换为＆＃39; NSIndexPath＆＃39;

2 个答案: