How to loop through JSON with SwiftyJSON?
If you want loop through json["items"]
array, try:
for (key, subJson) in json["items"] { if let title = subJson["title"].string { println(title) }}
As for the second method, .arrayValue
returns non Optional
array, you should use .array
instead:
if let items = json["items"].array { for item in items { if let title = item["title"].string { println(title) } }}
I Find it a bit strange explained myself, because actually using:
for (key: String, subJson: JSON) in json { //Do something you want}
gives syntax errors (in Swift 2.0 atleast)
correct was:
for (key, subJson) in json {//Do something you want}
Where indeed key is a string and subJson is a JSON object.
However I like to do it a little bit different, here is an example:
//jsonResult from API request,JSON result from Alamofire if let jsonArray = jsonResult?.array { //it is an array, each array contains a dictionary for item in jsonArray { if let jsonDict = item.dictionary //jsonDict : [String : JSON]? { //loop through all objects in this jsonDictionary let postId = jsonDict!["postId"]!.intValue let text = jsonDict!["text"]!.stringValue //...etc. ...create post object..etc. if(post != nil) { posts.append(post!) } } } }
In the for loop, the type of key
can't be of the type "title"
. Since "title"
is a string, go for : key:String
. And then Inside the Loop you can specifically use "title"
when you need it. And also the type ofsubJson
has to be JSON
.
And Since a JSON file can be considered as a 2D array, the json["items'].arrayValue
will return multiple objects. It is highly advisable to use : if let title = json["items"][2].arrayValue
.
Have a look at : https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html