How to get json data from nested dictionary in swift - ios

Question

How can I access data from a nested dictionary - when I want to save all data from "CourseDates”? CourseDates = NSArrayM
let json = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments)
if let test = json[0]["CourseDates"] as? [[String : AnyObject]] {
// heres my problem
}

Answer 1

You can create a function that returns NSDictionary like this:
func parseJSON(data: NSData) -> NSDictionary{
var dic: NSDictionary!
do {
boardsDictionary = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
} catch let error as NSError {
print(error.localizedDescription)
print("Error could not parse JSON data, it's null maybe?!!")
}
//'\(jsonStr)'
return dic
}
UPDATE:
Add This:
public class func jsonToNSData(json: AnyObject) -> NSData?{
return NSJSONSerialization.dataWithJSONObject(json, options: .allZeros, error: nil)
}
let dic = parseJSON(jsonToNSData(YourJsonData)) as! NSDictionary

Answer 2

Hi you can try SwiftyJson, It is a great source through which you can deal with complex JSON in a much more simpler way then you ever thought. For example
{
"metadata":{
"responseInfo":{
"status":200,
"developerMessage":"OK",
}
},
"results":[
{
"title":"Legal immigrants should get freedom before undocumented immigrants – moral, just and fair",
"body":"I am petitioning President Obama's Administration to take a humane view of the plight of legal immigrants. Specifically, legal immigrants in Employment Based (EB) category. I believe, such immigrants were short changed in the recently announced reforms via Executive Action (EA), which was otherwise long due and a welcome announcement.",
"issues":[
{
"id":"28",
"name":"Human Rights"
},
{
"id":"29",
"name":"Immigration"
}
],
"signatureThreshold":100000,
"signatureCount":267,
"signaturesNeeded":99733,
},
{
"title":"National database for police shootings.",
"body":"There is no reliable national data on how many people are shot by police officers each year. In signing this petition, I am urging the President to bring an end to this absence of visibility by creating a federally controlled, publicly accessible database of officer-involved shootings.",
"issues":[
{
"id":"28",
"name":"Human Rights"
}
],
"signatureThreshold":100000,
"signatureCount":17453,
"signaturesNeeded":82547,
}
]
}
From this JSON if you want to extract the result you can do easily like this
func parseJSON(json: JSON) {
for result in json["results"].arrayValue {
let title = result["title"].stringValue
let body = result["body"].stringValue
let sigs = result["signatureCount"].stringValue
let obj = ["title": title, "body": body, "sigs": sigs]
objects.append(obj)
}
}

Answer 3

Here is the simple example how can we extract data from the NSDictionary. And this is simple and i'm not following any standards...
I considered json data in String format.
var data = "{\"data\":{\"fName\":\"naveen\",\"lName\":\"kumar\"},\"friend\":[{\"name\":\"manju\",\"male\":true},{\"name\":\"tanuja\",\"male\":false}]}"
After that you can do
var nsdata = data.dataUsingEncoding(NSUTF16StringEncoding)
if let json = try? NSJSONSerialization.JSONObjectWithData(nsdata!, options: .MutableContainers) as! NSDictionary {
if let some = json["friend"]![0]["name"]! {
print(some) // prints -- manju
}
}
By using the subscipt we can get the data.