php - 通过 PHP 从 mySQL 获取值到 swift

Question

我有一个返回 json_encode 值的 php 文件，当我转到 http 地址时，他们给我值但是我无法从服务器端获取我的应用程序的值(value)我已经尝试了很多次但它没有得到它

func loadData() {

    let url = NSURL(string: "http://example.com/getExpo.php")
    let request = NSMutableURLRequest(URL: url!)

    // modify the request as necessary, if necessary

    NSURLSession.sharedSession().dataTaskWithRequest(request, completionHandler: { (data:NSData?, response:NSURLResponse?, error:NSError?) -> Void in

        if error != nil {
            // Display an alert message

            print(error)

            return
        }

        do {

            let json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as? NSDictionary


                if (json != nil) {

                    //let userId = parseJSON["userId"] as? String

                    // Display an alert message
                    let userMessage = json!["id"] as? String

                    print(userMessage)

                } else {

                    // Display an alert message
                    let userMessage = "Could not fetch Value"
                    print(userMessage)

                }



        } catch  {

            print(error)

        }

    }).resume()


}

谁能帮忙，谢谢!!

Answer 1

您的 JSON 响应是字典的数组:

[{"id":"115","expoName":"aziz","expoDetails":"aziz","expoPhone":"aziz","expoLocation":"aziz"}]

但是您正试图将其转换为字典:

let json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as? NSDictionary

解决方案当然是将其转换为数组:

let json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as? NSArray

如果可以，最好使用 Swift 类型:

let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? [[String:AnyObject]]

然后例如你可以使用一个循环:

if let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? [[String:AnyObject]] {
    for item in json {
        let userMessage = item["id"] as? String
    }
}