ios - 无法将 TableViewCell 类型的值转换为 'NSIndexPath'

Question

无法将“Google_Books_1.BookTableViewCell”类型的值 (0x105557600) 转换为“NSIndexPath”(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

为什么不以 tableView 的 indexPathForSelectedRow 属性为基础呢？

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
        }
    }
}