How to read from a plist with Swift 3 iOS app

-Disclaimer-
I'm extremely new to iOS and Swift development, but I'm not particularly new to programming.

I have a basic iOS application with Swift3 elements in it.I've created a plist file with some entries I want to read and display in my application. (No write access is necessary)

How can you read a value for a given key for a bundled plist file, in Swift3?

This seems like a really simple question to me, but a bunch of searching is making me question my whole conceptual approach.

Helpful tips would be appreciated.

Answers


Same way you have done in Swift 2.3 or lower just syntax is changed.

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

    //If your plist contain root as Array
    if let array = NSArray(contentsOfFile: path) as? [[String: Any]] {

    }

    ////If your plist contain root as Dictionary
    if let dic = NSDictionary(contentsOfFile: path) as? [String: Any] {

    }
}

Note: In Swift it is better to use Swift's generic type Array and Dictionary instead of NSArray and NSDictionary.

Edit: Instead of NSArray(contentsOfFile: path) and NSDictionary(contentsOfFile:) we can also use PropertyListSerialization.propertyList(from:) to read data from plist file.

if let fileUrl = Bundle.main.url(forResource: "fileName", withExtension: "plist"),
   let data = try? Data(contentsOf: fileUrl) {
       if let result = try? PropertyListSerialization.propertyList(from: data, options: [], format: nil) as? [[String: Any]] { // [String: Any] which ever it is 
            print(result)
       }
}

As Swift 4 introduces Codable

Step 1: Load the Plist File from bundle.

Step 2: Use PropertyListDecoder for the decoding of property list values into semantic Decodable types.

Step 3: Create Codable Struct

Complete code -

 func setData() {
        // location of plist file
        if let settingsURL = Bundle.main.path(forResource: "JsonPlist", ofType: "plist") {

            do {
                var settings: MySettings?
                let data = try Data(contentsOf: URL(fileURLWithPath: settingsURL))
                    let decoder = PropertyListDecoder()
                settings = try decoder.decode(MySettings.self, from: data)
                    print("toolString is \(settings?.toolString ?? "")")
                print("DeviceDictionary is \(settings?.deviceDictionary?.phone ?? "")")
                print("RootPartArray is \(settings?.RootPartArray ?? [""])")

            } catch {
                print(error)
            }
        }
    }
}
struct MySettings: Codable {
    var toolString: String?
    var deviceDictionary: DeviceDictionary?
    var RootPartArray: [String]?

    private enum CodingKeys: String, CodingKey {
        case toolString = "ToolString"
        case deviceDictionary = "DeviceDictionary"
        case RootPartArray
    }

    struct DeviceDictionary: Codable {
        var phone: String?
        init(from decoder: Decoder) throws {
            let values = try decoder.container(keyedBy: CodingKeys.self)
            phone = try values.decodeIfPresent(String.self, forKey: .phone)
        }
    }
    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        toolString = try values.decodeIfPresent(String.self, forKey: .toolString)
        deviceDictionary = try values.decodeIfPresent(DeviceDictionary.self, forKey: .deviceDictionary)
        RootPartArray = try values.decodeIfPresent([String].self, forKey: .RootPartArray)

    }
}

Sample Plist file -> https://gist.github.com/janeshsutharios/4b0fb0e3edeff961d3e1f2829eb518db


Here is a Swift 3 implementation, based on Nirav D's answer:

    /// Read Plist File.
    ///
    /// - Parameter fileURL: file URL.
    /// - Returns: return plist content.
    func ReadPlist(_ fileURL: URL) -> [String: Any]? {
        guard fileURL.pathExtension == FileExtension.plist, let data = try? Data(contentsOf: fileURL) else {
            return nil
        }
        guard let result = try? PropertyListSerialization.propertyList(from: data, options: [], format: nil) as? [String: Any] else {
            return nil
        }
        print(result)
        return result
    }

Here is example how to get BundleID from Info plist:

var appBundleID = "Unknown Bundle ID"    
if let bundleDict = Bundle.main.infoDictionary, 
   let bundleID = bundleDict[kCFBundleIdentifierKey as String] as? String {
       appBundleID = bundleID
   }

The same way you may easily access any key. This approach is good for many-target projects.


For Swift 3.0, Following code directly targeting to key. Where as dict object will give everything which will be there in your plist file.

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

In AppDelegate File

var bundlePath:String!
    var documentPath:String!
    var plistDocumentPath:URL!
    let fileManager = FileManager()


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool
    {
        bundlePath = Bundle.main.path(forResource: "Team", ofType: "plist")

        documentPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first

        plistDocumentPath = URL.init(string: documentPath)?.appendingPathComponent("Team.plist")
        print(plistDocumentPath.path)

        if !fileManager.fileExists(atPath: plistDocumentPath.path){

            do {
                try fileManager.copyItem(atPath: bundlePath, toPath: plistDocumentPath.path)
            } catch  {
                print("error Occured \(error.localizedDescription)")
            }

        }


        return true
    }

In ViewController

 @IBOutlet weak var TeamTable: UITableView!
    var appDelegate:AppDelegate!
    var arrayForContacts:[[String:Any]]! // array object


    override func viewDidLoad() {
        super.viewDidLoad()




        appDelegate = UIApplication.shared.delegate as! AppDelegate


    }
    override func viewWillAppear(_ animated: Bool) {

        super.viewWillAppear(animated)

        if appDelegate.fileManager.fileExists(atPath: appDelegate.plistDocumentPath.path){
            arrayForContacts = []
            if let contentOfPlist = NSArray.init(contentsOfFile: appDelegate.plistDocumentPath.path ){
                arrayForContacts = contentOfPlist as! [[String:Any]]
                TeamTable.reloadData()
            }

        }
    }

You can also read value directly from your plist file by simply

let value = Bundle.init(for: AppDelegate.self).infoDictionary?["your plist key name"] as? Any

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