Question

I’m making in app that includes a user entering the price of an object, and the app outputs the price including tax. However, every time it outputs 0, and I get a run-time error involving the variable, myDouble. I’m trying to take the value put in a text field and multiplying it by 1.06 (I’m starting out with a set tax rate), and then setting a label to the new value. Here is my code:

-(IBAction)textFieldReturn:(id)sender
{
    [sender resignFirstResponder];
    NSString *myString = inputtext2.text;
    double myDouble = [myString doubleValue];
    myDouble = myDouble*1.06;
    NSLog(@"myDouble: %lf", myDouble);
    price.text = [NSString stringWithFormat:@"%g", myDouble];
}

Answer 1

Most likely your inputtext2 variable is nil, so it is returning nothing. If this is an outlet, check the connections in interface builder. If the outlet is not connected, the variable will be nil, so the string value will be nil, so the double value will be 0.