Swift

JSON: Nested Array

See more JSON Examples

Here we have a JSON object that contains nested arrays. This example demonstrates how to access the contents of the nested arrays.

{
 "numbers" : [ 
    ["even", 2, 4, 6, 8], 
    ["prime", 2, 3, 5, 7, 11, 13] 
  ] }

Swift

func chilkatTest() {
    var success: Bool = false

    let json = CkoJsonObject()!

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method. 
    var jsonStr: String? = "{ \"numbers\" : [ [\"even\", 2, 4, 6, 8], [\"prime\", 2, 3, 5, 7, 11, 13] ] }"

    success = json.load(json: jsonStr)
    if success != true {
        print("\(json.lastErrorText!)")
        return
    }

    // Get the value of the "numbers" object, which is an array that contains JSON arrays.
    var outerArray: CkoJsonArray? = json.array(of: "numbers")
    if json.lastMethodSuccess == false {
        print("numbers array not found.")
        return
    }

    var numArrays: Int = outerArray!.size.intValue
    var i: Int

    for i = 0; i <= numArrays - 1; i++ {

        var innerArray: CkoJsonArray? = outerArray!.array(at: i)

        // The first item in the innerArray is a string
        print("\(innerArray!.string(at: 0)!):")

        var numInnerItems: Int = innerArray!.size.intValue
        var j: Int
        for j = 1; j <= numInnerItems - 1; j++ {

            print("  \(innerArray!.int(at: j).intValue)")

        }

        innerArray = nil
    }

    outerArray = nil

}