“无法为类型为'Dictionary '的值加上下标为'String'类型的错误的下标

Question

我正在一个需要从.plist恢复保存的数据的项目中，但是我遇到一个错误无法用索引类型为'String'的下标'Dictionary'类型的值] 。我正在尝试解决问题，但是不幸的是我不知道如何解决。我尝试了一些在stackoverflow中到达这里的解决方案，但是没有成功。请帮我，因为这是我第一次创建一个恢复数据的功能。谢谢

 @objc func restoreSucceed() {
    performSelector(inBackground: #selector(stopIndicator), with: nil)
    //エラーアラートビューの表示
    let alertController = UIAlertController(title: "", message: "リストアが完了しました \n (Restore completed)", preferredStyle: .alert)
    alertController.addAction(UIAlertAction(title: "OK", style: .default))
    self.present(alertController, animated: true, completion: nil)

    if floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_7_1 {
        var pref = UserDefaults.standard
        //ローカルplist格納先を取得
        let strWorkPath = NSSearchPathForDirectoriesInDomains(.libraryDirectory, .userDomainMask, true)[0]
        let strPlistPath = "\(strWorkPath)/\(S_DIRECTORY_NAME)/\(S_PLIST_NAME)"
        let dicPref = NSDictionary(contentsOfFile: strPlistPath) as Dictionary?
        if let key1 = (dicPref as NSDictionary?)?.keyEnumerator() {
            for key in key1 {
                let strKey = key as? String
                pref.set(dicPref?[strKey ?? ""], forKey: strKey ?? "")
            }
        }
        pref.synchronize()
    }

    navigationController?.popViewController(animated: true)
}

Answer 1

用dicPref?[strKey ?? ""]替换dicPref?[strKey as! NSString]

注意：如果可能，请避免强行展开。

Answer 2

使用以下内容

pref.set(dicPref?[strKey! as NSString], forKey: strKey ?? "")

@@ Roy的回答是正确的，但会警告您打开包装纸

Answer 3

尝试下面的代码

var pref = UserDefaults.standard
let strWorkPath = NSSearchPathForDirectoriesInDomains(.libraryDirectory, .userDomainMask, true)[0]
let strPlistPath = "\(strWorkPath)/\(S_DIRECTORY_NAME)/\(S_PLIST_NAME)"

if let dicPref = NSDictionary(contentsOfFile: strPlistPath) as? Dictionary<String, AnyObject> {
     // use swift dictionary as normal
     if let key1 = (dicPref as NSDictionary?)?.keyEnumerator() {
         for key in key1 {
             if let strKey = key as? String {
                 pref.set(dicPref[strKey], forKey: strKey)
             }
          }
      }
}

pref.synchronize()

Answer 4

替换：

let dicPref = NSDictionary(contentsOfFile: strPlistPath) as Dictionary?

with：

 let dicPref = NSDictionary(contentsOfFile: strPlistPath)

。

 let pref = UserDefaults.standard

    let dicPref = NSDictionary(contentsOfFile: "")
    if let key1 = dicPref?.keyEnumerator() {
        for key in key1 {
            let strKey = key as? String
            pref.set(dicPref?[strKey ?? ""], forKey: strKey ?? "")
        }
    }