I'm making a calculator app that solves for the missing variable and I've added a piece of code that dismisses the keyboard by tapping anywhere on the screen or pressing the "return" key.
This function was working before I added the if else statements to check which variable was missing (using .isNaN) so that it could solve for that missing variable.
Here is my code for that specific view controller:
import UIKit
class findSpeed: UIViewController, UITextFieldDelegate {
@IBOutlet weak var vValue: UITextField!
@IBOutlet weak var dValue: UITextField!
@IBOutlet weak var tValue: UITextField!
@IBOutlet weak var answer: UILabel!
@IBAction func solve(_ sender: UIButton) {
let v = Float(vValue.text! as String);
let d = Float(dValue.text! as String);
let t = Float(tValue.text! as String);
let solvev = (d!/t!);
let solved = (v!*t!);
let solvet = (d!/v!);
if (v!.isNaN) {
answer.text = "Answer: \(solvev)"
}
else if (d!.isNaN) {
answer.text = "Answer: \(solved)"
}
else {
answer.text = "Answer: \(solvet)"
}
}
override func viewDidLoad() {
super.viewDidLoad()
vValue.delegate = self;
dValue.delegate = self;
tValue.delegate = self;
self.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: Selector("dismiss")))
}
func dismiss() {
vValue.resignFirstResponder()
dValue.resignFirstResponder()
tValue.resignFirstResponder()
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
vValue.resignFirstResponder()
dValue.resignFirstResponder()
tValue.resignFirstResponder()
return true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
The error I'm receiving occurs when I tap the button that links to this view controller where the calculator is: Picture of error
