UINavigaiongController的基本使用(1)
需求

1. xib 创建控制器(待更新)
2. 创建导航控制器,将OneViewController控制器设置为栈底控制器("基本使用",有实现)
3. 点击OneViewController 的Button,跳转到TwoViewController
4. 返回控制器
   4.1 返回上个控制器
   4.2 跳转到指定的控制器
   4.3 返回根控制器

层次结构

@interface UIViewController : UIResponder <NSCoding, UIAppearanceContainer, 
UITraitEnvironment, UIContentContainer, UIFocusEnvironment>
@interface UINavigationController : UIViewController

//UINavigationController的方法和属性
- (void)pushViewController:(UIViewController *)viewController animated:
  (BOOL)animated; 
//返回上个控制器
- (nullable UIViewController *)popViewControllerAnimated:(BOOL)animated;
//返回指定控制器
- (nullable NSArray<UIViewController *> *)popToViewController:
  (UIViewController *)viewController animated:(BOOL)animated;
//返回根控制器
- (nullable NSArray<UIViewController *> *)
  popToRootViewControllerAnimated:(BOOL)animated; 

@property(nullable, nonatomic,readonly,strong)
 UINavigationController *navigationController;

代码

@implementation OneViewController
- (IBAction)jumpTwo:(id)sender {
    //创建第二个控制器 
    //TowViewController 是自定义的UIViewController
    TowViewController * twoCon = [[TowViewController alloc]init];
    //获取导航控制器,调用导航控制器的pust方法
    [self.navigationController pushViewController:twoCon animated:YES];
}

@implementation ThreeViewController
- (IBAction)back:(id)sender {
    //获取导航控制器
    //返回上个控制器,移除栈顶的控制器
    //[self.navigationController popViewControllerAnimated:YES];
    
    //返回指定的控制
    //报错: Tried to pop to a view controller that doesn't exist
    //因为: OneViewControlle 是新建的控制器,并没有在UINavigationController里面
    //OneViewController * oneCon = [[OneViewController alloc]init];
    //[self.navigationController popToViewController:oneCon animated:YES];

 //OneViewController* oneCon = self.navigationController.viewControllers[0];
 //[self.navigationController popToViewController:oneCon animated:YES];
    
    //返回根控制器
    [self.navigationController popToRootViewControllerAnimated:YES];
    
}

效果图

点击按钮,跳转控制器