Webservice method not getting the value for the first click - ios

Question

in this i am getting the value through webservice. it's getting the value perfectly. for testing i used print statement and it's showing prefect values, but when i am assigning those values to variable it's not assgning on second click my variable are getting the values.. first time it goes in else, however it should go in if.
let task = URLSession.shared.dataTask(with: url!) {(data, response, error) in
if error != nil
{
print("Error")
}
else
{
if let content = data
{
do
{
let myJson = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as! NSDictionary
let asd = myJson.value(forKey: "signinResult")
print(asd!)
self.answer = String(describing: asd!)
var mystring = self.answer.components(separatedBy:"\"")
var mystrin = [String]()
let size = mystring.count
var i = 0
while (i < size-1 )
{
let st1 = mystring[i+1]
mystrin = st1.components(separatedBy:",")
self.em = mystrin[0]
print(self.em)
self.pw = mystrin[1]
print(self.pw)
self.na = mystrin[2]
print(self.na)
self.num = mystrin[3]
print (self.num)
i += 2
}
}
catch
{
}
}
}
task.resume()
if email.text == em && pwd.text == pw
{
GlobalVariable.myString=em
GlobalVariable.name=na
GlobalVariable.number=num
GlobalVariable.pwd = pw
GlobalVariable.i=1
self.performSegue(withIdentifier: "segue", sender: nil)
}
else
{
let alert = UIAlertController(title: "Alert", message: "Wrong Email and password", preferredStyle:UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
self.present(alert,animated: true, completion: nil)
}

Answer 1

You set value of that variable in web service block but using it outside the block so first time it doesn't have value to show when you click send time meanwhile web service response and value assign to that variable so get it.
The code should be like this.
let task = URLSession.shared.dataTask(with: url!) {(data, response, error) in
if error != nil
{
print("Error")
}
else
{
if let content = data
{
do
{
let myJson = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as! NSDictionary
let asd = myJson.value(forKey: "signinResult")
print(asd!)
self.answer = String(describing: asd!)
var mystring = self.answer.components(separatedBy:"\"")
var mystrin = [String]()
let size = mystring.count
var i = 0
while (i < size-1 )
{
let st1 = mystring[i+1]
mystrin = st1.components(separatedBy:",")
self.em = mystrin[0]
print(self.em)
self.pw = mystrin[1]
print(self.pw)
self.na = mystrin[2]
print(self.na)
self.num = mystrin[3]
print (self.num)
i += 2
}
if email.text == em && pwd.text == pw
{
GlobalVariable.myString=em
GlobalVariable.name=na
GlobalVariable.number=num
GlobalVariable.pwd = pw
GlobalVariable.i=1
self.performSegue(withIdentifier: "segue", sender: nil)
}
else
{
let alert = UIAlertController(title: "Alert", message: "Wrong Email and password", preferredStyle:UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
self.present(alert,animated: true, completion: nil)
}
}
catch
{
}
}
}
task.resume()