LeftViewController  *leftVC     = [[LeftViewController alloc] init];
    RightViewController *rightVC    = [[RightViewController alloc] init];
    MainViewController  *mainVC     = [[MainViewController alloc] init];
    
    DDSliderViewController *sliderVC = [[DDSliderViewController alloc] initWithMainViewController:mainVC leftViewController:leftVC rightViewController:rightVC];
    [sliderVC setSlideSpeed:0.5];