当我运行我的代码时，我收到此错误，但我不知道为什么。
错误域=NSCocoaErrorDomain 代码=3840“无值。” UserInfo={NSDebugDescription=无值。}
我在互联网上查找但没有找到任何东西。
这是我的代码：
let myUrl = NSURL(string: "http://foodhelper.club/registerUser.php");
let request = NSMutableURLRequest(URL:myUrl!);
request.HTTPMethod = "POST";
let postString = "userEmail=\(userEmail!)&userFirstName=\(userFirstName!)&userLastName=\(userLastName!)&userPassword=\(userPassword!)";
request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding);
NSURLSession.sharedSession().dataTaskWithRequest(request, completionHandler: { (data:NSData?, response:NSURLResponse?, error:NSError?) -> Void in
dispatch_async(dispatch_get_main_queue())
{
if error != nil {
self.alertMessage(error!.localizedDescription)
print("fail")
return
}
do {
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary
print ("1")
if let parseJSON = json {
let userId = parseJSON["userId"] as? String
print ("2")
if( userId != nil)
{
let myAlert = UIAlertController(title: "Alert", message: "Registration successful", preferredStyle: UIAlertControllerStyle.Alert);
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default){(action) in
self.navigationController?.popViewControllerAnimated(true) }
myAlert.addAction(okAction);
self.presentViewController(myAlert, animated: true, completion: nil)
} else {
let errorMessage = parseJSON["message"] as? String
print ("3")
if(errorMessage != nil)
{
self.alertMessage(errorMessage!)
}
}
}
} catch{
//email vergleich fehlt, egal ob
print(error)
print("catched error")
let myAlert = UIAlertController(title: "Alert", message: "Registration successful", preferredStyle: UIAlertControllerStyle.Alert);
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default){(action) in
self.navigationController?.popViewControllerAnimated(true)
}
myAlert.addAction(okAction);
self.presentViewController(myAlert, animated: true, completion: nil)
}
}
}).resume()
}
感谢您的帮助
您需要设置内容类型标头值才能使用 JSON。
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
将代码更新到 Swift 3 并删除了与请求无关的所有内容：
let myUrl = URL(string: "http://foodhelper.club/registerUser.php");
var request = URLRequest(url:myUrl!);
request.httpMethod = "POST";
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
let postString = "userEmail=email&userFirstName=firstname&userLastName=lastname&userPassword=password";
request.httpBody = postString.data(using: String.Encoding.utf8);
URLSession.shared.dataTask(with: request, completionHandler: { (data:Data?, response:URLResponse?, error:Error?) -> Void in
if error != nil {
print("fail")
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
print ("1")
if let parseJSON = json {
let userId = parseJSON["userId"] as? String
print ("2")
if( userId != nil) {
} else {
let errorMessage = parseJSON["message"] as? String
print ("3")
}
}
} catch{
print(error)
}
}).resume()
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