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Extract string values ​​from dictionary <String, AnyObject> in Swift

I just want to extract some string values ​​from a json response in Swift, but I just can't seem to find an easy way to do this.

var result: Dictionary<String, AnyObject> = [ "name" : "Steve", "surname" : "Jobs"]

if let name = result["name"] {
    //Warning: Constant 'name' inferred to have 'AnyObject', which may be unexpected
}

if let name = result["name"] as String {
    //Error: (String, AnyObject) is not convertible to String
}

What's the right way?

amuses

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2 answers


In Swift String

, it is a struct, not a class. The protocol you need to use is Any

, not AnyObject

. Alternatively, you can import Foundation

also downcast AnyObject as? NSString

.

When talking about downcasting, you can optionally do so using the operator ?

. Your final code should look like this:



let result : [String: Any] = ["name" : "Steve", "surname" : "Jobs"]

if let name = result["name"] as? String {
    // no error
}

PS You can use the new annotation [KeyType: ValueType]

instead Dictionary<KeyType, ValueType>

.

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Try SwiftyJSON which is the best way to handle JSON data in Swift



var result: Dictionary<String, AnyObject> = [ "name" : "Steve", "surname" : "Jobs"]
let json = SwiftJSON.JSON(object: result)

if let name = json["name"].string {
    //do what you want
} else {
    //print the error message if you like
    println(json["name"])
}
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