如何在Swift中从索引处的Array（）获取值？

Question

    let urlPath: String = "http://binaenaleyh.net/dusor/"
    var url: NSURL = NSURL(string: urlPath)
    var imgData: NSData = NSData(contentsOfURL: url)

    let jsonDict = NSJSONSerialization.JSONObjectWithData(imgData, options: nil, error: &error) as NSDictionary

    println(jsonDict["dersler"])

It returns the whole JSON value, but I need the value at a specific index only.

Answer 1

I take it jsonDict is either an NSDictionary or a [NSObject:AnyObject] ? First off, you shouldn't be using valueForKey() . The appropriate method on NSDictionary is objectForKey . But even better, you can just subscript it.

Of course, the results of the subscript are a value typed as AnyObject , and you can't just subscript that. You need to cast it to the appropriate type. If you know the cast will succeed you can just use as , otherwise you'll need as? . Assuming the latter, this would look like

if let ary = jsonDict["dersler"] as? [Int] {
    let x: Int = ary[0]
    println(x)
}

Answer 2

Surely you can just do...

println(jsonDict["dersler"][0])

?

This has been asked many times too.