ios - 下标使用不明确

Question

我有一个带有自定义单元格的可扩展表格，当点击可见行时，这些单元格会出现或消失。单元格的数据存储在 plist 中并声明为 NSMutableArray。

我在以下代码中遇到“下标使用不明确”错误，希望其他人遇到过此问题并知道修复方法。 我已经尝试了所有可能的选项，据我所知，我必须添加。

var cellDescriptors: NSMutableArray!

func getCellDescriptorForIndexPath(indexPath: NSIndexPath) -> [String: AnyObject] {
        let indexOfVisibleRow = visibleRowsPerSection[indexPath.section][indexPath.row]
        let cellDescriptor = cellDescriptors[indexPath.section][indexOfVisibleRow] as! [String: AnyObject]
        return cellDescriptor
    }

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        let indexOfTappedRow = visibleRowsPerSection[indexPath.section][indexPath.row]

        if cellDescriptors[indexPath.section][indexOfTappedRow]["isExpanded"] as! Bool == true {  // Ambiguous use of subscript error
            var shouldExpandAndShowSubRows = false
            if cellDescriptors[indexPath.section][indexOfTappedRow]["isExpanded"] as! Bool == false {  // Ambiguous use of subscript error
                // In this case the cell should expand.
                shouldExpandAndShowSubRows = true
            }

Answer 1

Cor，我假设你现在已经解决了这个问题，但在找到解决方案后，我想我会提请你注意:

    func getCellDescriptorForIndexPath(indexPath: NSIndexPath) -> [String: AnyObject] {
    let indexOfVisibleRow = visibleRowsPerSection[indexPath.section][indexPath.row]
    // HERE IS WHAT YOU WANT: 
    let cellDescriptor = (cellDescriptors[indexPath.section] as! NSMutableArray)[indexOfVisibleRow] as! [String: AnyObject]
        return cellDescriptor
    }