type String does not conform to protocol sequencetype

Question

Here is the code, I\'m trying to make a simple calculator :

@IBAction func btnOperatorInput(sender: UIButton) {
    let op = (\"+\", \"-\", \"*\", \"/\")

           


        

Answer 1

The error is easily solved, you need to access the String's CharacterView:

for _ in op.0.characters {

       self.calc.add(Int(nr1)!, secondNumber: Int(nr2)!)

}

Note: As another commenter has queried above, I'm not sure why you'd want to iterate over what will always be a single and predictable character but I guess this might just be example code.