ios - 使用 [indexPath.section][indexPath.row] 的下标使用不明确

Question

在我更新到 Xcode 7.2 后，弹出一个错误提示“下标的使用不明确”:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
      let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)

      /*ERROR - Ambiguous use of subscript*/
      cell.textLabel?.text = self.tvArray[indexPath.section][indexPath.row] as? String 

      //..... more code
}

谁能告诉我在实现 tvArray 时我做错了什么？

设置:

var tvArray = []

override func viewWillAppear(animated: Bool) {
super.viewWillAppear(true)

  //..... more code
  tvArray = [["Airing Today", "On The Air", "Most Popular", "Top Rated"], ["Action & Adventure", "Animation", "Comedy", "Documentary", "Drama", "Family", "Kids", "Mystery", "News", "Reality", "Sci-Fic & Fantasy", "Soap", "Talk", "War & Politics", "Western"]]
  //..... more code
}

Answer 1

tvArray = [] 没有显式类型被推断为 [AnyObject]。

告诉编译器数组的正确类型:包含 String 数组的 Array。
然后它知道数组可以通过索引下标。

var tvArray = Array<[String]>()

或

var tvArray = [[String]]()

额外的好处:不需要 cellForRowAtIndexPath 中的类型转换

cell.textLabel?.text = self.tvArray[indexPath.section][indexPath.row]