- (void)viewDidLoad {
    [super viewDidLoad];
    self.d_navBarAlpha = 0.5;
    [self.navigationController d_setNavigationBarAlpha:0.5];
}


- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    BTableViewController *vc = [[BTableViewController alloc] init];
    [self.navigationController d_pushViewController:vc fromAlpha:self.d_navBarAlpha toAlpha:0];
}

@interface UIViewController (GYDNav)

/**
 当前navigationBar的透明度 默认1.0
 */
@property (nonatomic, assign) CGFloat d_navBarAlpha;


/**
 是否启用全屏侧滑返回 默认YES
 */
@property (nonatomic, assign) BOOL d_fullScreenEnable;



@end


@interface UINavigationController (GYDNav)


/**
 设置导航栏的alpha 
 
 @param alpha 透明度
 */
- (void)d_setNavigationBarAlpha:(CGFloat)alpha;


/**
 设置导航栏线是否隐藏

 @param hidden 是否隐藏
 */
- (void)d_setShaowViewHidden:(BOOL)hidden;


/**
 在push下一个控制器之前 添加转场动画代理 动态地修改导航栏的alpha 防止突兀

 @param viewController toViewController
 @param fromAlpha 上一个控制器所持有的Alpha
 @param toAlpha 下一个控制器所持有的Alpha
 */
- (void)d_pushViewController:(UIViewController *)viewController fromAlpha:(CGFloat)fromAlpha toAlpha:(CGFloat)toAlpha;


@end

- (void)viewDidLoad {
    [super viewDidLoad];
    //取消全屏侧滑返回
    self.d_fullScreenEnable = NO;
}