快速检查 HTTP Post 请求

Posted 2023-03-16

【中文标题】快速检查 HTTP Post 请求

【英文标题】：HTTP Post Request check in swift

【发布时间】：2015-07-29 11:45:52

【问题描述】：

我有 php 文件来检查从 swift ios 传递的值，我打印 json 数据，这是代码：

<?php
$said = $_REQUEST['sa_id'];
if($said == '123456') 
    $returnValue = array("said" => "true");
else
    $returnValue = array("said" => "false");

echo json_encode($returnValue);
?>

我还写了一个快速函数来检查返回的值，我的代码在第二次点击时工作成功，我想要它从第一次点击：

class ViewController: UIViewController 

    var saidResult = false;

    @IBOutlet var saidField: UITextField!
    @IBOutlet var labelField: UILabel!

    override func viewDidLoad()
        super.viewDidLoad()
       

    @IBAction func checkSAID(sender: UIButton) 

        if ( isValidSAID(saidField.text) == false ) 
            labelField.text = "SAID is Invalid"
         else 
            labelField.text = "Done"
        
    

    func isValidSAID(said2Test: String) -> Bool 

        let myUrl = NSURL(string: "http://*****.com/said.php");
        let request = NSMutableURLRequest(URL:myUrl!);
        request.HTTPMethod = "POST";

        // Compose a query string
        let postString = "sa_id=\(said2Test)";

        request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding);
        let task = NSURLSession.sharedSession().dataTaskWithRequest(request) 
            (data, response, error) in
            if error != nil 
                println("error=\(error)")
                return
            

            // You can print out response object
            println("response = \(response)")

            // Print out response body
            let responseString = NSString(data: data, encoding: NSUTF8StringEncoding)
            println("responseString = \(responseString)")

            //Let's convert response sent from a server side script to a NSDictionary object:
            var err: NSError?
            var myJSON = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error:&err) as? NSDictionary

            if let parseJSON =myJSON 
                // Now we can access value of First Name by its key
                var saidValue = parseJSON["said"] as? String
                println("saidValue: \(saidValue)")

                if ((saidValue) == "true" ) 
                    self.saidResult = true;
                

                println("saidResult: \(self.saidResult)");
            
        
        task.resume()
        println("saidResult: \(self.saidResult)");
        if ( self.saidResult == true )
            return true
         else 
            return false
        

    

正如我所说，在第一次单击时，saidResult 的值是 false，但之后它会采用 true 值

我该如何解决这个问题，或者有其他方法可以改进我的代码吗？

【参考方案1】：

我认为这可能是因为 http 请求在第一次点击时没有得到响应，而是在第二次点击时得到响应。

你可以尝试用这个替换你的 checkSAID 函数。

@IBAction func checkSAID(sender: UIButton) 

    let saidQueue = dispatch_queue_create("saidQueue", DISPATCH_QUEUE_CONCURRENT)

    // Do the checking on a background thread.
    dispatch_async(saidQueue, 
        if ( isValidSAID(saidField.text) == false ) 
    // As the UI updates are performed on the main queue, update the label on the main queue.
            dispatch_async(dispatch_get_main_queue()) 
                labelField.text = "SAID is Invalid"
            )
         else 
            dispatch_async(dispatch_get_main_queue()) 
                labelField.text = "Done"
            )
        
    )

【参考方案2】：

最后，经过 4 天的测试，我解决了我的问题。

我更改了isValidSAID功能代码：

func isValidSAID(said2Test: String) -> Bool 

    var status: String = "";

    let myUrl = NSURL(string: "http://*****.com/said.php?sa_id=\(said2Test)");
    let data = NSData(contentsOfURL: myUrl!)
    let json = NSHSONSerialization.JSONObjectWithData(data!, option: nil, error: nil) as! NSDictionary

    status = (json["said"] as? String)!
    println(status)

    return ( status == "true" ) ? true : false

并解决了我的问题。