How to wait for user to click UILabel?

Question

I want to make a while loop wait until a user clicks on a UILabel in a Swift Playground on Xcode. How can I do this?

Here's my loop

func gameLoop() {

    while(score >= 0) {

        let n = arc4random_uniform(3)

        if(n == 0) {
            opt1.text = rightStatements.randomElement()
            opt2.text = wrongStatements.randomElement()
            opt3.text = wrongStatements.randomElement()
        } else if(n == 1) {
            opt1.text = wrongStatements.randomElement()
            opt2.text = rightStatements.randomElement()
            opt3.text = wrongStatements.randomElement()
        } else if(n == 2) {
            opt1.text = wrongStatements.randomElement()
            opt2.text = wrongStatements.randomElement()
            opt3.text = rightStatements.randomElement()
        }
    }

}

For example, I want to wait until the user either clicks opt1, opt2, or opt3 Then do something based on what the user clicks.

Never, ever run an infinite loop on the main thread waiting for something to happen. Change your `UILabel` to a `UIButton` and use `IBAction`. — Code Different, Apr 02 '17 at 12:58

score 1 · Answer 1 · answered Apr 02 '17 at 13:35

Use Buttons instead of Labels and assign tag = 1, 2, and 3 for buttons. Create an IBAction function for the buttons and connect all the buttons to the same function.

Make variable 'n' as global.

var n = Int()

func nextAttempt() {

    if(score >= 0) {

        n = arc4random_uniform(3)

        if(n == 0) {
            opt1.text = rightStatements.randomElement()
            opt2.text = wrongStatements.randomElement()
            opt3.text = wrongStatements.randomElement()
        } else if(n == 1) {
            opt1.text = wrongStatements.randomElement()
            opt2.text = rightStatements.randomElement()
            opt3.text = wrongStatements.randomElement()
        } else if(n == 2) {
            opt1.text = wrongStatements.randomElement()
            opt2.text = wrongStatements.randomElement()
            opt3.text = rightStatements.randomElement()
        }
    }
   else
    {
      //Score < 0
      //Game Over
    }

 }


@IBAction func onButtonClick(_ sender: Any)
{
switch(sender.tag)
   {
    case 1:
      if (n==0)
       {
         //Right button tapped
         //Update score if you want
       }
      else
       {
         self.nextAttempt()
        }
  case 2:
     if (n==1)
      {
       //Right button tapped
       //Update score if you want
      }
     else
     {
       self.nextAttempt()
     }
  case 3:
    if (n==2)
    {
       //Right button tapped
       //Update score if you want
    }
    else
    {
      self.nextAttempt()
    }
  }
}

Hope this helps you!!

How to wait for user to click UILabel?

1 Answers1