[button addTarget:self action:@selector(BtnPressed:) forControlEvents:UIControlEventTouchUpInside];

This is how you can add gesture to your UIButton instead of button action.

UILongPressGestureRecognizer * recognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];    
        recognizer.minimumPressDuration = 0.1;  
        [self.mButton.view addGestureRecognizer:recognizer];
        [recognizer release];

- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer{ 

        //1 = start
        if(gestureRecognizer.state==1 || gestureRecognizer.state==3)[self mToggle];
        //3=end
}

or simply ?

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

    if ((touch.view == yourButton)) {
        return NO;
    }
    return YES;
}