Swift：来自 URL 而不是本地的 JSON 文件

Question

现在我有这个：

let path : String = NSBundle.mainBundle().pathForResource("jsonFile", ofType: "json") as String!
    let jsonData = NSData(contentsOfFile: path) as NSData!
    let readableJSON = JSON(data :jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil)

但我想从一个 url 接收文件，而不是在我的应用程序中。

Answer 1

您需要阅读一些苹果文档：NSURLConnection 和 NSURLSession

这里有一个快速解决方案来说明如何实现这一点。

func fetchDetailsFromServer() {
    let urlPath = "Server URL to Fetch JSON"
    let url = NSURL(string: urlPath)
    let session = NSURLSession.sharedSession()
    let task = session.dataTaskWithURL(url!, completionHandler: {data, response, error -> Void in
        println("Task completed")
        if(error != nil) {
            // If there is an error in the web request, print it to the console
            println(error.localizedDescription)
        }
        var err: NSError?
        if let jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as? NSDictionary {
            if(err != nil) {
                // If there is an error parsing JSON, print it to the console
                println("JSON Error \(err!.localizedDescription)")
            }

            // Use your jsonResult appropriately here
        }
    })

    // The task is just an object with all these properties set
    // In order to actually make the web request, we need to "resume"
    task.resume()
}