If statement for Switch Value Changed Action in Xcode

Question

Hi

Why is my it skipping the first statement and only displaying the kg message (else statement) regardless of what my switch is set to? Should I be using a function other than toggleSwitchWeight?

Thanks so much for your help guys! :D

-(IBAction) WswitchValueChanged{
    if (toggleSwitchWeight.on)
    {
        weightpounds =  [weight.text intValue]; //converts string in textfield to integer and assigns to variable weightpounds
        weightkg = 1;
        Output.text = [NSString stringWithFormat:@"%ld pounds", (long)weightpounds];
    }
    else
    {

        weightkg =  [weight.text intValue]; //converts string in textfield to integer and assigns to variable weightkg
        weightpounds = 1;
        Output.text = [NSString stringWithFormat:@"%ld kg", (long)weightkg];
    }
}