让UIView、UIWindow等透明遮挡不影响下面视图操作方法

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
    UIView *hitView = [super hitTest:point withEvent:event];
    if ((hitView == self)
    {
        return nil;
    }
    else
    {
        return hitView;
    }

}