运行我的应用并尝试注册用户后出现以下错误:
线程1:EXC_BAD_INSTRUCTION(代码= EXC_l386_INVOP,s子代码= 0x0)
这出现在代码的末尾:
} as! (数据?,URLResponse?,错误?) - >无效)
let myUrl = NSURL(string: "http://127.0.0.1/MySQL_PHP/userRegister.php")
var request = URLRequest(url: myUrl as! URL)
request.httpMethod = "POST"
// let config = URLSessionConfiguration.default
let session = URLSession.shared
let postString = "email=\(userEmail)&passwort=\(userPasswort)&vorname=\(userVorname)&nachname=\(userName)&benutzer=\(userBenutzer)"
request.httpBody = postString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request, completionHandler: { (data: Data?, response: URLResponse?, error: Error?) in
if error != nil {
print("error=\(error)")
return
}
var err: NSError?
var json = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary
if let parseJSON = json {
var resultValue = parseJSON["status"] as? String
print("result: \(resultValue)")
var isUserRegistered: Bool = false
if (resultValue == "Success") {
isUserRegistered = true
}
var messageToDisplay: String = parseJSON["message"] as! String!
if (!isUserRegistered){
messageToDisplay = parseJSON["message"] as! String!
}
DispatchQueue.main.async(execute: {
var myAlert = UIAlertController(title:"Alert", message: messageToDisplay, preferredStyle: UIAlertControllerStyle.alert)
let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default){
action in
self.dismiss(animated: true, completion: nil)
}
myAlert.addAction(okAction)
self.present(myAlert, animated: true, completion: nil)
})
}
} as! (Data?, URLResponse?, Error?) -> Void )
task.resume()
答案 0 :(得分:2)
该错误具有误导性。它与数据任务关闭没有直接关系。
首先不要施放
Album.objects.filter(tracks__isnull=True)
使用尾随闭包语法甚至更短:
let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
...
})
发生错误是因为let task = session.dataTask(with: request) { (data, response, error) in
...
}
周围缺少do - catch
块
通过添加try JSONSerialization
块或使用do - catch
最后有一个建议:请不要在Swift中使用try!
。你正在与强大的类型系统作斗争。