How to make UISwitch a BOOL?

Answer 1

You either need to connect the UISwitch to an IBAction method that updates isOn, or read the state of the switch in your test.

Here's the latter: UPDATE Changed the code after you clarified the relationships between the view controllers.

- (void)updateLabels:(NSString *)text isOn:(BOOL)isOn {
    [nameLabel setText:text]; 
    if (isOn == YES) {
       [onLabel setText:(@"ON")];
    } else {
       [onLabel setText:(@"OFF")]; 
    }
}

The call to updateLabels, which I'm hoping exists in FlipSideViewController, should look something like this: (I obviously don't know your variables names.)

[self.delegate updateLabels:self.myTextField.text isOn:self.mySwitch.on];