Xcode - Label won't clear when button is pressed - ios

Question

So I'm trying to create a simple function in my app in which a button adds 1 integer to the label when it's pressed and the other one clears it.
Here is the code:
class ViewController: UIViewController {
var number = 0
#IBOutlet weak var tapCount: UILabel!
#IBAction func plusTapped(sender: AnyObject) {
number = number + 1
tapCount.text = String(number)
}
#IBAction func minusTapped(sender: AnyObject) {
var totalNumber = number - number
tapCount.text = String(totalNumber)
}
However the label does clear when the minus button is tapped but when the plus button is tapped after, it adds up from the previous number before the minus button was pressed.
How do I fix this in a way so that it actually clears the label?

Answer 1

#IBAction func minusTapped(sender: AnyObject) {
number = 0 // add this line to reset the counter, the real number
tapCount.text = String(number)
}

Answer 2

Try
#IBAction func minusTapped(sender: AnyObject) {
number = 0
tapCount.text = String(0)
}

Answer 3

I think it's because when you're handling tap on minus you are altering local variable and not changing number itself. You should change "number" too. Se my comments in your's code
class ViewController: UIViewController {
var number = 0
#IBOutlet weak var tapCount: UILabel!
#IBAction func plusTapped(sender: AnyObject) {
number = number + 1
tapCount.text = String(number)
}
#IBAction func minusTapped(sender: AnyObject) {
//here totalNumber is changed but number is still the same
var totalNumber = number - number
tapCount.text = String(totalNumber)
}