uitextfield is not convertible to uint8

Question

im trying to get a button to output numbers onto a textfield but i keep getting this error

this is my code, the amountOutput is the one with the error

@IBAction func Output(sender: AnyObject) {
    yieldOutput.text = String (format:"%.2f", yield[1] )
    amountOutput.text = Double (typeAmount * (yieldOutput / 100)) + unit
}

Answer 1

yieldOutput in your code isn't a number, it's a text field. That means that to use the value in it, you need to transform it into a number or use a variable that already holds that value. In your case, yield[1] is the variable you use to set the value for yieldOutput . Just do:

amountOutput.text = Double (typeAmount * (yield[1] / 100)) + unit