Flow Control in Xcode - ios

Question

For some reason, even if input a valid input, namely, an integer, it does seem to go into if statement in the function, #IBAction func guess(sender: UIButton){}. In other words, if I input 5, the console output will say "Please input a valid number." Not "you guessed to high" or "you guessed to low" or "you win!". Any suggestion on how to fix this?
The following is my code:
class ViewController: UIViewController {
//just some member variables. I don't think the problem is here.
#IBOutlet weak var inputField: UITextField!
#IBOutlet weak var output: UITextView!
var guesses : UInt = 0;
var number : UInt32 = 0;
var gameover = false;
let MAX_GUESSES = 8;
var possibleGuess : Int?
override func viewDidLoad() {
super.viewDidLoad()
number = generateNewNumber()
consoleOut("I'm thinking of a number...\n")
var possibleGuess : Int? = inputField.text.toInt()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//consoleOut here prints out stuff on the app.
func consoleOut(text : String) {
output.text = output.text + text;
}
func generateNewNumber() -> UInt32 {
return arc4random_uniform(100) + 1
}
func clearInput() {
output.text = ""
}
//here lies the problem. The control never seems to go inside of
//if let guess = possibleGuess{}
#IBAction func guess(sender: UIButton) {
if let guess = possibleGuess {
if UInt32(guess) > number {
consoleOut("\(guess): You guessed to high\n")
++guesses
}
else if UInt32(guess) < number {
consoleOut("\(guess): You guessed to low\n")
++guesses
}
else {
consoleOut("\(guess): You win!\n")
consoleOut("Go again? (y/n)")
guesses = 0
gameover = true
}
clearInput()
}
else {
clearInput()
consoleOut("Please input a valid number")
}
}
}

Answer 1

This is a very common mistake.
You declare a variable possibleGuess as optional Int instance variable, but later you declare a variable with the same name in viewDidLoad() whose scope is locally only within the viewDidLoad() method.
Solution : delete the var keyword in the viewDidLoad() method.
possibleGuess = inputField.text.toInt()
The explicit type annotation is not needed too as the type has been already defined.