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

Question

我更新到 Xcode 7.2 后弹出一个错误提示 "Ambiguous use of subscript" 在下面：

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
}

谁能告诉我我在实现 tvArray 时做错了什么？

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

没有显式类型的

tvArray = [] 被推断为 [AnyObject].

告诉编译器数组的正确类型：包含 String.
数组的 Array 那么它就知道数组可以通过index下标了。

var tvArray = Array<[String]>()

或

var tvArray = [[String]]()

额外好处：不需要 cellForRowAtIndexPath 中的类型转换

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

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

Ambiguous use of subscript using [indexPath.section][indexPath.row]

arrays

ambiguous

ios

swift

swift2