Question

我已成功将plist文件中的数据读入表格视图。现在，我只想知道如何添加另一个＆＃34;项目＆＃34;用字符串＆＃34;名称＆＃34;和＆＃34;位置＆＃34;附接。

我正在寻找的是一种方法，发送一个字符串保存为＆＃34; name＆＃34;或＆＃34;位置＆＃34;对于一个新的＆＃34;项目＆＃34;。例如，如果我单击一个按钮，输入的信息将存储在一个新的＆＃34;项目＆＃34;下的plist文件中。

有人可以帮助我朝正确的方向发展吗？如果是你，你会做什么？

我使用的是Swift 3和Xcode 8.2.1

这是我的.plist文件： enter image description here

这是我用来获取＆＃34; name＆＃34;和＆＃34;位置＆＃34; ＆＃34;项目＆＃34;，以便我可以将其插入表格视图中：

CountA

Answer 1

这是阅读和帮助的辅助结构。写plist：

用法：

//Reading :
let rootArray = PlistFile(named: "PlistFilename")?.array
let rootDictionary = PlistFile(named: "PlistFilename")?.dictionary

//Writing :

if let plistFile = PlistFile(named : "UserData") {
  plistFile.array = yourArray
}

//or :

try? PlistFile(named : "UserData")?.write(yourArray)

代码：

struct PlistFile {

    enum PlistError: Error {
        case failedToWrite
        case fileDoesNotExist
    }

    let name:String

    var sourcePath:String? {
        return Bundle.main.path(forResource: name, ofType: "plist")
    }

    var destPath:String? {
        if let _ = sourcePath {
            let dir = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
            return (dir as NSString).appendingPathComponent("\(name).plist")
        } else {
            return nil
        }
    }

    var dictionary : [String:Any]? {
        get{
            return getDictionary()
        }
        set{
            if let newDict = newValue {
                try? write(dictionary: newDict)
            }
        }
    }

    var array : [Any]? {
        get{
            return getArray()
        }
        set{
            if let newArray = newValue {
                try? write(array: newArray)
            }
        }
    }

    private let fileManager = FileManager.default

    init?(named :String) {
        self.name = named

        guard let source = sourcePath, let destination = destPath, fileManager.fileExists(atPath: source)  else {
            return nil
        }

        if !fileManager.fileExists(atPath: destination) {
            do {
                try fileManager.copyItem(atPath: source, toPath: destination)
            } catch let error {
                print("Unable to copy file. ERROR: \(error.localizedDescription)")
                return nil
            }
        }
    }


    private func getDictionary() -> [String:Any]? {
        guard let destPath = self.destPath, fileManager.fileExists(atPath: destPath) else {
            return nil
        }
        return NSDictionary(contentsOfFile: destPath) as? [String:Any]
    }

    private func getArray() -> [Any]? {
        guard let destPath = self.destPath, fileManager.fileExists(atPath: destPath) else {
            return nil
        }
        return NSArray(contentsOfFile: destPath) as? [Any]
    }

    func write(dictionary : [String:Any]) throws{
        guard let destPath = self.destPath, fileManager.fileExists(atPath: destPath) else {
            throw PlistError.fileDoesNotExist
        }

        if !NSDictionary(dictionary: dictionary).write(toFile: destPath, atomically: false) {
            print("Failed to write the file")
            throw PlistError.failedToWrite
        }
    }

    func write(array : [Any] ) throws {
        guard let destPath = self.destPath, fileManager.fileExists(atPath: destPath) else {
            throw PlistError.fileDoesNotExist
        }

        if !NSArray(array: array).write(toFile: destPath, atomically: false) {
            print("Failed to write the file")
            throw PlistError.failedToWrite
        }
    }


}

Answer 2

使用PropertyListSerialization保存重复动态字典的简单方法

let plistDict: [String: Any] = ["Key": "Value"]

//Write Data Into Plist
func writePlist(dictContent: [String: Any]) {

    let url = URL(fileURLWithPath: PlistManager.path)
    do {
        let data = try Data(contentsOf: url)
        var array = try PropertyListSerialization.propertyList(from: data, format: nil) as! [[String:Any]]
        array.append(dictContent)
        let writeData = try PropertyListSerialization.data(fromPropertyList: array, format: .xml, options:0)
        try writeData.write(to: url)
    } catch {
        print(error)
    }
}

Answer 3

你可以试试这段代码：

class SavedTracks: NSObject,NSCoding {
var name: String
var location: String

required init(name:String="", location:String="") {
    self.name = name
    self.location = location
}

required init(coder decoder: NSCoder) {
    self.name = decoder.decodeObject(forKey: "Name") as? String ?? ""
    self.location = decoder.decodeObject(forKey: "location") as? String ?? ""
}

func encode(with coder: NSCoder) {
    coder.encode(name, forKey:"Name")
    coder.encode(location, forKey:"location")
}
}
class DataModel: NSObject {

var saveTrack = [SavedTracks]()

override init(){
    super.init()
    print("document file path：\(documentsDirectory())")
    print("Data file path：\(dataFilePath())")
}

//save data
func saveData() {
    let data = NSMutableData()
    let archiver = NSKeyedArchiver(forWritingWith: data)
    archiver.encode(saveTrack, forKey: "userList")
    archiver.finishEncoding()
    data.write(toFile: dataFilePath(), atomically: true)
}

//read data
func loadData() {
    let path = self.dataFilePath()
    let defaultManager = FileManager()
    if defaultManager.fileExists(atPath: path) {
        let url = URL(fileURLWithPath: path)
        let data = try! Data(contentsOf: url)
        let unarchiver = NSKeyedUnarchiver(forReadingWith: data)
        saveTrack = unarchiver.decodeObject(forKey: "userList") as! Array
        unarchiver.finishDecoding()
    }
}

func documentsDirectory()->String {
    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory,
                                                    .userDomainMask, true)
    let documentsDirectory = paths.first!
    return documentsDirectory
}

func dataFilePath ()->String{
    return self.documentsDirectory().appendingFormat("/userList.plist")
}
}
class ViewController: UIViewController {
var dataModel = DataModel()

override func viewDidLoad() {
    super.viewDidLoad()
    onCreateData()
}

//create data
func onCreateData(){
    dataModel.saveTrack.append(SavedTracks(name: "jack", location: "xxx"))
    dataModel.saveTrack.append(SavedTracks(name: "tom", location: "yyyy"))
    dataModel.saveTrack.append(SavedTracks(name: "rose", location: "zzz"))
}

@IBAction func saveData(_ sender: UIButton) {
    dataModel.saveData()
    print("succeed")
}

@IBAction func printData(_ sender: UIButton) {
    dataModel.loadData()
    print("succeed!", dataModel.saveTrack)
}
}

将数据保存到Swift 3中的.plist文件

3 个答案: