如何在Swift中将plist作为字典？

Question

我在玩苹果的新Swift编程语言，遇到了一些问题...当前，我正在尝试读取plist文件，在Objective-C中，我将执行以下操作以将内容作为NSDictionary获取：NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Config" ofType:@"plist"];NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:filePath];如何在Swift中将plist作为字典？我假设我可以通过以下方式获得plist的路径：let path = NSBundle.mainBundle().pathForResource("Config", ofType: "plist")当这可行时（如果正确的话？）：如何将内容作为字典？还有一个更笼统的问题：是否可以使用默认的NS *类？我想是...还是我错过了什么？据我所知，默认框架NS *类仍然有效并且可以使用吗？

Answer 1

在Swift 3.0中，从Plist读取。

func readPropertyList() {

        var propertyListFormat =  PropertyListSerialization.PropertyListFormat.xml //Format of the Property List.

        var plistData: [String: AnyObject] = [:] //Our data

        let plistPath: String? = Bundle.main.path(forResource: "data", ofType: "plist")! //the path of the data

        let plistXML = FileManager.default.contents(atPath: plistPath!)!

        do {//convert the data to a dictionary and handle errors.

            plistData = try PropertyListSerialization.propertyList(from: plistXML, options: .mutableContainersAndLeaves, format: &propertyListFormat) as! [String:AnyObject]

        } catch {

            print("Error reading plist: \(error), format: \(propertyListFormat)")

        }

    }

Answer 2

您仍然可以在Swift中使用NSDictionaries：

对于Swift 4

 var nsDictionary: NSDictionary?

 if let path = Bundle.main.path(forResource: "Config", ofType: "plist") {

    nsDictionary = NSDictionary(contentsOfFile: path)

 }

对于Swift 3+

if let path = Bundle.main.path(forResource: "Config", ofType: "plist"),

   let myDict = NSDictionary(contentsOfFile: path){

    // Use your myDict here

}

和旧版的Swift

var myDict: NSDictionary?

if let path = NSBundle.mainBundle().pathForResource("Config", ofType: "plist") {

    myDict = NSDictionary(contentsOfFile: path)

}

if let dict = myDict {

    // Use your dict here

}

NSClasses仍然可用，并且可以在Swift中完美使用。我认为他们可能希望很快将重点转移到swift，但是目前swift API并没有核心NSClasses的所有功能。

Answer 3

如果我要将.plist转换为Swift字典，这就是我要做的事情：

if let path = NSBundle.mainBundle().pathForResource("Config", ofType: "plist") {

  if let dict = NSDictionary(contentsOfFile: path) as? Dictionary<String, AnyObject> {

    // use swift dictionary as normal

  }

}

为Swift 2.0编辑：

if let path = NSBundle.mainBundle().pathForResource("Config", ofType: "plist"), dict = NSDictionary(contentsOfFile: path) as? [String: AnyObject] {

    // use swift dictionary as normal

}

为Swift 3.0编辑：

if let path = Bundle.main.path(forResource: "Config", ofType: "plist"), let dict = NSDictionary(contentsOfFile: path) as? [String: AnyObject] {

        // use swift dictionary as normal

}