Swift

Get the Root of a JSON Document

See more JSON Examples

Demonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document:

{
  "flower": "tulip",
  "abc":
    {
    "x": [
       { "a" : 1 },
       { "b1" : 100, "b2" : 200 },
       { "c" : 3 }
    ],
    "y": 200,
    "z": 200
    }
}

Swift

func chilkatTest() {
    var success: Bool = false

    let json = CkoJsonObject()!

    var jsonStr: String? = "{\"flower\": \"tulip\",\"abc\":{\"x\": [{ \"a\" : 1 },{ \"b1\" : 100, \"b2\" : 200 },{ \"c\" : 3 }],\"y\": 200,\"z\": 200}}"

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

    // Get the "abc" object.
    let abcObj = CkoJsonObject()!
    success = json.objectOf2(jsonPath: "abc", jsonObj: abcObj)
    if success == false {
        print("\(json.lastErrorText!)")
        return
    }

    // Side note: The JSON of a sub-part of the document can be emitted from any JSON object:
    abcObj.emitCompact = false
    print("\(abcObj.emit()!)")

    // Navigate to the "x" array
    let xArray = CkoJsonArray()!
    abcObj.arrayOf2(jsonPath: "x", jarr: xArray)

    // Navigate to the 2nd object contained within the array.  This contains members b1 and b2
    let bObj = CkoJsonObject()!
    xArray.objectAt2(index: 1, jsonObj: bObj)

    // Show that we're at "b1/b2".
    // The value of "b1" should be "200"
    print("b2 = \(bObj.int(of: "b2").intValue)")

    // Now go back to the JSON doc root:
    let docRoot = CkoJsonObject()!
    bObj.getDocRoot2(docRoot: docRoot)

    // We'll skip the null check and assume it's non-null...

    // Pretty-print the JSON doc from the root to show that this is indeed the root.
    docRoot.emitCompact = false
    print("\(docRoot.emit()!)")

}