我想从我的php服务器获取jSON响应后显示一个UIAlertController,所以在检查响应中有一个返回id时,在if else语句中,我写了一个代码来显示一个UIAlertController但是我不能让它发挥作用。
以下是我的错误摘录
断言失败 - [UIKeyboardTaskQueue waitUntilAllTasksAreFinished]
我的IBAction按钮代码
@IBAction func btnRegister(sender: AnyObject) {
let parameters = ["name": tfName.text! , "contact": tfContact.text! ,"email": tfEmail.text!] as Dictionary<String, String>
let request = NSMutableURLRequest(URL: NSURL(string:"http://192.168.1.8/safeproject/registerprofile.php")!)
let session = NSURLSession.sharedSession()
request.HTTPMethod = "POST"
//Note : Add the corresponding "Content-Type" and "Accept" header. In this example I had used the application/json.
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
request.HTTPBody = try! NSJSONSerialization.dataWithJSONObject(parameters, options: [])
let task = session.dataTaskWithRequest(request) { data, response, error in
guard data != nil else {
print("no data found: \(error)")
return
}
let successAlert = UIAlertController(title: "Registration Status", message:"Register Success", preferredStyle: .Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default) { _ in })
let failAlert = UIAlertController(title: "Registration Status", message:"Register Fail", preferredStyle: .Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default) { _ in })
// Present the controller
do {
if let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
print("Response: \(json)")
let id = json["id"]!
if(id.isEqual(""))
{
self.presentViewController(failAlert, animated: true){}
print("User register fail");
}
else
{
self.presentViewController(successAlert, animated: true){}
print("User register success");
}
} else {
let jsonStr = NSString(data: data!, encoding: NSUTF8StringEncoding)// No error thrown, but not NSDictionary
print("Error could not parse JSON: \(jsonStr)")
}
} catch let parseError {
print(parseError)// Log the error thrown by `JSONObjectWithData`
let jsonStr = NSString(data: data!, encoding: NSUTF8StringEncoding)
print("Error could not parse JSON: '\(jsonStr)'")
}
}
task.resume()
}
答案 0 :(得分:1)
当您尝试显示警报控制器时,您正在使用单独的线程,因此您需要在显示之前切换回来。
if(id.isEqual("")){
NSOperationQueue.mainQueue().addOperationWithBlock {
self.presentViewController(failAlert, animated: true){}
}
}...