建议先看
UInavigationController,UInavigationBar,UInavigationBarItem三者的区别
是什么 ? (导航控制器)
- UINavigationController 是一个容器类。里面盛放的是UIViewController。
- 这个容器在管理UIViewController时，遵循栈管理的原则（后进先出）。
-
UINavigationController它由以下四部分组成：Navigation toolbar、Custom content、Navigation bar、,Navigation view。
UINavigationController的组成
做什么用?
- 轻松管理多个控制器的切换!
- 导航控制器,以栈(先进后出)的形式管理控制器!
效果图
界面化创建
初始化UINavigaiongController
//第一种
UINavigationController *nav = [[UINavigationController alloc]init];
//第二种 (推荐)
//初始化 UINavigationController,同时添加底部子控制器
UINavigationController *nav =
[[UINavigationController alloc]initWithRootViewController:vc1];
添加子控制器(控制器跳转)
//第一种
[nav pushViewController:vc1 animated:YES];
//第二种(推荐)
nav.viewControllers = @[vc1,vc2];
获取所有子控制器
NSLog(@"%@",nav.viewControllers); //UINavigationController的属性
NSLog(@"%@", nav.childViewControllers);//UIViewController的属性,只读
层次结构
@interface UIWindow : UIView
@interface UIScreen : NSObject <UITraitEnvironment>
@interface UIViewController : UIResponder <NSCoding, UIAppearanceContainer,
UITraitEnvironment, UIContentContainer, UIFocusEnvironment>
@interface UINavigationController : UIViewController
//UIWindow的方法和属性
- (void)makeKeyAndVisible;
@property(nullable, nonatomic,strong) UIViewController *rootViewController
//UIView 的方法和属性
- (instancetype)initWithFrame:(CGRect)frame;
@property(nullable, nonatomic,copy) UIColor *backgroundColor
//UIScreen 的方法和属性
+ (UIScreen *)mainScreen;
@property(nonatomic,readonly) CGRect bounds;
//UIViewController 的方法和属性
@property(null_resettable, nonatomic,strong) UIView *view;
@property(nonatomic,readonly)
NSArray<UIViewController*> * childViewControllers;//只读
//UINavigationController 的方法和属性
- (void)pushViewController:(UIViewController *)viewController
animated:(BOOL)animated;
@property(nonatomic,copy) NSArray<UIViewController *> *viewControllers;
完整代码
- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//创建window
self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
//初始化 UINavigationController(第一种)
UINavigationController *nav = [[UINavigationController alloc]init];
// 创建子控制器
UIViewController *vc1 = [[UIViewController alloc]init];
vc1.view.backgroundColor = [UIColor orangeColor];
UIViewController *vc2 = [[UIViewController alloc]init];
vc2.view.backgroundColor = [UIColor yellowColor];
//初始化 UINavigationController,同时添加底部子控制器(第二种)
//UINavigationController *nav =
//[[UINavigationController alloc]initWithRootViewController:vc1];
// pushViewController 入栈
//[nav pushViewController:vc1 animated:YES];
//[nav pushViewController:vc2 animated:NO];
nav.viewControllers = @[vc1,vc2];
//获取所有子控制器
NSLog(@"%@",nav.viewControllers); //UINavigationController的属性
NSLog(@"%@", nav.childViewControllers);//UIViewController的属性,只读
//设置成根控制器
self.window.rootViewController = nav;
//显示window
[self.window makeKeyAndVisible];
return YES;
}
