UIAlertControllers未执行或未显示。如果我只写一个print语句然后在控制台输出，但现在print语句也没有被执行（如果我把它们与UIAlertControllers一起写，就像我在下面写的代码中那样）。
Alamofire.request(some_url, method: .post, parameters: data, encoding: URLEncoding.default, headers: nil).responseJSON{
response in
let json = JSON(response.result.value)
print(json)
self.eventid = json[0]["EventRegID"].stringValue
if !json[0]["AuthKeyError"].exists(){
if !json[0]["ExceptionOccured"].exists(){
if !json[0]["RegistrationFailed"].exists() {
if !json[0]["EventInHold"].exists() {
if json[0]["RegistrationSuccess"].exists() {
let alertController = UIAlertController(title: "", message: json[0]["RegistrationSuccess"].stringValue, preferredStyle: .alert)
let no1Action = UIAlertAction(title: "OK", style: .default) { (action) -> Void in
print("The user has registered successfully")
}
alertController.addAction(no1Action)
}
else{
}
}
else {
let alertController = UIAlertController(title: "", message: "Event is on hold.", preferredStyle: .alert)
let no2Action = UIAlertAction(title: "OK", style: .default) { (action) -> Void in
print("The event is on hold.")
}
let yes2Action = UIAlertAction(title: "GO", style: .default) { (action) -> Void in
self.performSegue(withIdentifier: "bullshit", sender: self)
}
alertController.addAction(no2Action)
alertController.addAction(yes2Action)
}
}
else {
print("Registration failed due to connection issues. Please login.")
let alertController = UIAlertController(title: "", message: "Registration failed", preferredStyle: .alert)
let no3Action = UIAlertAction(title: "OK", style: .default) { (action) -> Void in
print("The registration failed")
}
alertController.addAction(no3Action)
}
}
else {
print("There's some problem with the database")
let alertController = UIAlertController(title: "", message: "Some problem with the server", preferredStyle: .alert)
let no4Action = UIAlertAction(title: "OK", style: .default) { (action) -> Void in
print("The user has registered successfully")
}
alertController.addAction(no4Action)
}
}
else {
print("AuthKeyError")
let alertController = UIAlertController(title: "", message: "Auth key error", preferredStyle: .alert)
let no5Action = UIAlertAction(title: "OK", style: .default) { (action) -> Void in
print("AAUTH KEY ERROR")
}
alertController.addAction(no5Action)
}
}
}
else {
print("not ok")
}
}
答案 0 :(得分：0)
您需要在addAction
presentViewController(alertController, animated: true, completion: nil)
也许你必须在新的操作中提出它
OperationQueue.main.addOperation {
presentViewController(alertController, animated: true, completion: nil)
}