CODEWITHSUNDEEP
swiftnsdictionary
CMartins
CMartins

Reputation: 3293

I can't Unwrap a value from a plist key value

I'm new to swift and I'm trying to load a property from a nsDictionary to vTitle

var nsDictionary: NSDictionary?
         if let path = Bundle.main.path(forResource: "AppData", ofType: "plist") {
            nsDictionary = NSDictionary(contentsOfFile: path)
         }
let vTitle:String = nsDictionary["LbVacationsTitle"]

When I debug I see the right keys in nsDictionary but I can't unwrap the value of just one key The type of LbVacationsTitle is a string

Upvotes: 1

Views: 75

Answers (2)

vadian
vadian

Reputation: 285190

Please don't use the NSDictionary API in Swift to read a property list.

There is PropertyListSerialization (or even PropertyListDecoder)

let url = Bundle.main.url(forResource: "AppData", withExtension: "plist")!
let data = try! Data(contentsOf: url)
let dictionary = try! PropertyListSerialization.propertyList(from: data, format: nil) as! [String:Any]
let vTitle = dictionary["LbVacationsTitle"] as! String

As the file is immutable in the application bundle any crash reveals a design mistake

Upvotes: 1

Phillip Mills
Phillip Mills

Reputation: 31016

Depending on your style preference...

var nsDictionary: NSDictionary?
if let path = Bundle.main.path(forResource: "AppData", ofType: "plist") {
    nsDictionary = NSDictionary(contentsOfFile: path)
}
if let dict = nsDictionary {
    let vTitle = dict["LbVacationsTitle"] as? String
    if let vt = vTitle {
        // ...
    }
}

...or...

var nsDictionary: NSDictionary?
if let path = Bundle.main.path(forResource: "AppData", ofType: "plist") {
    nsDictionary = NSDictionary(contentsOfFile: path)
}
guard let dict = nsDictionary else {
    print("Couldn't get a valid dictionary")
    return
}
let vTitle = dict["LbVacationsTitle"] as? String
guard let vt = vTitle else {
    print("Couldn't find a string matching LbVacationsTitle")
    return
}
// ...

Upvotes: 1

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