Swift：遍历字典数组

Question

我正在努力循环遍历从 Web 服务调用返回的字典值数组。

我已经实现了以下代码，但我似乎在运行上遇到了崩溃。

我还想将结果存储到自定义结构中。真的很难做到这一点，到目前为止这里的答案还没有奏效。如果有人能够提供帮助，将不胜感激。

    let nudgesURLString = "http://www.whatthefoot.co.uk/NUDGE/nudges.php"
    let nudgesURL = NSURL(string: nudgesURLString)

    let session = NSURLSession.sharedSession()

    let task = session.dataTaskWithURL(nudgesURL!, completionHandler: {data, response, error -> Void in

        if error != nil {
            println(error)
        } else {

           let nudgesJSONResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary

            let nudges: NSDictionary = nudgesJSONResult["nudges"] as NSDictionary

            if let list = nudgesJSONResult["nudges"] as? [[String:String]] {
                for nudgeDict in list {
                    let location = nudgeDict["location"]
                    println(location)
                }
            }

        }

    })

    task.resume()

}

Answer 1

注意事项

此答案是使用 Swift 1.2 编写的，因此，根据您当前的 Swift 系统，可能需要对答案进行一些细微的文体和语法更改才能正常工作。

答案 -- Swift 1.2

这一行使您的代码崩溃：

let nudges: NSDictionary = nudgesJSONResult["nudges"] as NSDictionary

您正在强制转换 Swift 无法处理的问题。你永远不会进入你的 for 循环。

尝试将您的代码更改为更像这样：

let nudgesURLString = "http://www.whatthefoot.co.uk/NUDGE/nudges.php"
let nudgesURL = NSURL(string: nudgesURLString)

let session = NSURLSession.sharedSession()

let task = session.dataTaskWithURL(nudgesURL!, completionHandler: {data, response, error -> Void in
    if error != nil {
        println(error)
    } else {
        let nudgesJSONResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as [String : AnyObject]
        if let nudges = nudgesJSONResult["nudges"] as? [[String : String]] {
            for nudge in nudges {
                let location = nudge["location"]
                println("Got location: \(location)")
                println("Got full nudge: \(nudge)")
            }
        }
    }

})

task.resume()

Answer 2

谢谢，

我创建了以下存储数据的结构，还允许我在视图控制器中为特定索引创建字典。

struct NudgesLibrary {

var location: NSArray?
var message: NSArray?
var priority: NSArray?
var date: NSArray?
var nudges: NSArray?

init(nudgesObject: AnyObject) {

    nudges = (nudgesObject["nudges"] as NSArray)

    if let nudges = nudgesObject["nudges"] as? NSArray {
        location =  (nudges.valueForKey("location") as NSArray)
        message = (nudges.valueForKey("message") as NSArray)
        priority = (nudges.valueForKey("priority") as NSArray)
        date = (nudges.valueForKey("date") as NSArray)

    }
  }
}

Swift：遍历字典数组

Swift: Looping through a Dictionary Array

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