UINavigaiongController的基本使用(1)
需求

1. xib 創建控制器(待更新)
2. 創建導航控制器,將OneViewController控制器設置為棧底控制器("基本使用",有實現)
3. 點擊OneViewController 的Button,跳轉到TwoViewController
4. 返回控制器
   4.1 返回上個控制器
   4.2 跳轉到指定的控制器
   4.3 返回根控制器

層次結構

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

//UINavigationController的方法和屬性
- (void)pushViewController:(UIViewController *)viewController animated:
  (BOOL)animated; 
//返回上個控制器
- (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;

代碼

@implementation OneViewController
- (IBAction)jumpTwo:(id)sender {
    //創建第二個控制器 
    //TowViewController 是自定義的UIViewController
    TowViewController * twoCon = [[TowViewController alloc]init];
    //獲取導航控制器,調用導航控制器的pust方法
    [self.navigationController pushViewController:twoCon animated:YES];
}

@implementation ThreeViewController
- (IBAction)back:(id)sender {
    //獲取導航控制器
    //返回上個控制器,移除棧頂的控制器
    //[self.navigationController popViewControllerAnimated:YES];
    
    //返回指定的控制
    //報錯: Tried to pop to a view controller that doesn't exist
    //因為: OneViewControlle 是新建的控制器,并沒有在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];
    
}

效果圖

點擊按鈕,跳轉控制器