Ios swift-保存plist字典而不覆盖键

我正在创建一个便笺应用程序，我正在尝试将数据保存到plist字典中，然而，当我保存一个新便笺时，我拥有的代码将替换旧便笺

如何在不替换旧数据的情况下在字典中添加新数据

let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
            let documentsDirectory = paths.objectAtIndex(0) as! NSString
            let path = documentsDirectory.stringByAppendingPathComponent("notes.plist")
            var dict: NSMutableDictionary = ["XInitializerItem": "DoNotEverChangeMe"]
            //saving

            dict.setObject(noteResult.text, forKey: nameSave.text)

            //writing

            dict.writeToFile(path, atomically: false)
            let resultDictionary = NSMutableDictionary(contentsOfFile: path)
            println("Saved note.plist file is --> \(resultDictionary?.description)")

装货注意事项：

func loadNotes(){

        let plistPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
        let DocumentsDirectory = plistPath[0] as! String
        let path = DocumentsDirectory.stringByAppendingPathComponent("notes.plist")
        let fileManager = NSFileManager.defaultManager()

        if (!fileManager.fileExistsAtPath(path)) {

            if let bundlePath = NSBundle.mainBundle().pathForResource("notes", ofType: "plist") {

                let resultDictionary = NSMutableDictionary(contentsOfFile: bundlePath)
                println("Bundle notes.plist file is --> \(resultDictionary?.description)")
                fileManager.copyItemAtPath(bundlePath, toPath: path, error: nil)
                println("copy")

            } else {
                println("notes.plist not found")
            }


        }else {
            println("note.plist already exists")

            //fileManager.removeItemAtPath(path, error: nil)
        }

        let resultDictionary = NSMutableDictionary(contentsOfFile: path)
        println("Loaded notes.plist file is --> \(resultDictionary?.description)")
        var myDict = NSDictionary(contentsOfFile: path)

        if let dict = myDict {
            //load values

        } else {

            println("worning ccould not create dictionary from notes.plist, default values will be used")
        }

    }

---

第1点：从文件系统加载字典后，请您设置一个断点并再次检查，它包含以前保存的数据。这很可能是真的，那么第二点会对你有所帮助。如果此点已断开，请确保修复此点，然后将其破解：）

第2点：字典必须具有唯一键。问题在你下面的陈述中。确保每次保存新便笺时都使用新密钥保存。检查 在字典中保存数据时使用nameSave.text值

dict[nameSave.text] = noteResult.text

编辑：

我发现这里的问题是，您没有使用文件系统中已保存的文件初始化词典。您必须首先确保在文件系统中用notes.plist填充字典，然后向字典中添加新数据，最后将其保存回去

我就是这样做的；只是将您提到的两种方法组合在一个流中。在保存操作触发时调用此函数。在这里，我想，第一次检查可能不见了。我没有测试这个代码，所以请容忍我

func saveNotes() {
    // First fetch old notes
    let plistPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
    let DocumentsDirectory = plistPath[0] as! String
    let path = DocumentsDirectory.stringByAppendingPathComponent("notes.plist")
    let fileManager = NSFileManager.defaultManager()

    if (!fileManager.fileExistsAtPath(path)) {

        if let bundlePath = NSBundle.mainBundle().pathForResource("notes", ofType: "plist") {

            let resultDictionary = NSMutableDictionary(contentsOfFile: bundlePath)
            println("Bundle notes.plist file is --> \(resultDictionary?.description)")
            fileManager.copyItemAtPath(bundlePath, toPath: path, error: nil)
            println("copy")

        } else {
            println("notes.plist not found")
        }


    } else {
        println("note.plist already exists")

        //fileManager.removeItemAtPath(path, error: nil)
    }

    let resultDictionary = NSMutableDictionary(contentsOfFile: path)
    println("Loaded notes.plist file is --> \(resultDictionary?.description)")
    var myDict = NSDictionary(contentsOfFile: path)

    if let dict = myDict {
        // Save new value
        dict.setObject(noteResult.text, forKey: nameSave.text)
    } else {
        println("worning ccould not create dictionary from notes.plist, default values will be used")
    }

    // Now save it back
    dict.writeToFile(path, atomically: false)

}

---

供将来参考，解决方案是：

// First fetch old notes
            let plistPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
            let DocumentsDirectory = plistPath[0] as! String
            let path = DocumentsDirectory.stringByAppendingPathComponent("notes.plist")
            let fileManager = NSFileManager.defaultManager()

            if (!fileManager.fileExistsAtPath(path)) {

                if let bundlePath = NSBundle.mainBundle().pathForResource("notes", ofType: "plist") {

                    let resultDictionary = NSMutableDictionary(contentsOfFile: bundlePath)
                    println("Bundle notes.plist file is --> \(resultDictionary?.description)")
                    fileManager.copyItemAtPath(bundlePath, toPath: path, error: nil)
                    println("copy")

                } else {
                    println("notes.plist not found")
                }


            } else {
                println("note.plist already exists")

                //fileManager.removeItemAtPath(path, error: nil)
            }

            var myDict = NSDictionary(contentsOfFile: path)

            if let dict = myDict {
                // Save new value
                var noteResultAll = "Date: " + saveDate.text! + "\n" + noteResult.text

                dict.setValue(noteResultAll, forKey: nameSave.text)
                dict.writeToFile(path, atomically: false)
            } else {
                println("worning ccould not create dictionary from notes.plist, default values will be used")
            }

            // Now save it back

            let resultDictionary = NSMutableDictionary(contentsOfFile: path)
            println("Loaded notes.plist file is --> \(resultDictionary?.description)")

---

谢谢，密钥总是以不同的值保存。nameSave.text是一个UITextField，用户可在其中选择要删除的键的值saved@SNos请看我更新的帖子。在继续添加新数据之前，请确保在字典中填充已保存的数据。谢谢@Abhinav，我知道我需要加载旧值并在保存前添加新值。但我不知道如何解决这个问题。请看我的更新帖子和我的加载功能我刚刚更新了我的答案。请检查一下@SNosNSDictionary没有成员名称“setObject”&未解析标识符“dict”的使用