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[英]Swift HTTP Post Request dataUsingEncoding malformes the string
[英]HTTP Post Request check in swift
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);
?>
我也写了一个快捷的功能来检查返回的所说的值,我的代码是第二次点击成功,我希望第一次点击它:
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
}
}
}
如我所说,在第一次单击中,saidResult的值为false,但之后为真值
我如何解决此问题,或者还有另一种方法可以改善我的代码?
我认为这可能是因为http请求在第一次单击时没有得到答复,而在第二次单击时得到了答复。
您可以尝试以此替换您的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"
})
}
})
}
最终,经过4天的测试,我解决了我的问题。
我更改了isValidSAID函数代码:
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
}
解决了我的问题
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