參數類型“ AnyObject”不符合預期的類型NSCopying

Question

我正在嘗試在Swift使用NSDictionary ，並且NSDictionary了上述問題。 我有以下格式的字典：

let xyz: NSMutableDictionary = ["1":[1,2,3,4,"1","n","1","2"],"2":[1,2,3,4,"+","o","6","2"]]

我想遍歷字典中的鍵並提取數組的第6個元素。 我嘗試了以下方法； 但沒有遇到任何運氣：

for keys in dictKeyMutableDict {
    let xCentVal = xyz[keys as! [NSCopying]][6]
}

我繼續收到下標錯誤，如果我刪除as! [NSCopying] as! [NSCopying] ，我收到以上錯誤。 有誰知道如何處理這種情況？

Answer 1

刪除NSMutableDictionary並通過將其設為var使其可變。 現在，您可以刪除as! [NSCopying] as! [NSCopying]

var xyz = ["1":[1,2,3,4,"1","n","1","2"],"2":[1,2,3,4,"+","o","6","2"]]

for keys in dictKeyMutableDict {
    let xCentVal = xyz[keys]![6]
}

或更好的可選包裝：

for keys in dictKeyMutableDict {
    if let v = xyz[keys] {
        let xCentVal = v[6]
    }
}