UINavigationController详解(一)
最后更新于：2022-04-01 06:58:59
@UINavigationControlle简介:
1.导航控制器,专门管理具有层级关系内容的导航
2.采用栈的方式管理所有controller,每个controller管理各自的视图
3.推出显示一个新的controller
4.提供返回上一级controller的默认button和方法
@UINavigationControlle结构:
1.它是UIViewController的子类,因此它也由view属性
2.它的view包含3个子视图:navigationBar contentView(不是属性) toolbar
3.导航控制器使用这些对象实现导航界面,我们负责提供这些对象,进行展示,参考下图(苹果官方):
UINavigationController view层级
@UINavigationControlle的创建:
1.它以栈的方式管理所控制的视图,至少要有一个被管理的UIViewController作为rootViewController
2.导航界面的对象会被同时创建
3.设置delegate,监控导航堆栈的变化,即viewControllers,topController,visibleController等等
代码示例:
~~~
HMTViewController * hmtView = [[HMTViewController alloc]init];
UINavigationController * rootNavigation = [[UINavigationController alloc]initWithRootViewController:hmtView];
NSLog(@"%@",rootNavigation);
self.window.rootViewController = rootNavigation;
~~~
@UINavigationControlle导航方法:
1.推出下一级controller(入栈):
pushViewController:animated:
2.返回上一级controller(出栈):
popViewControllerAnimated: // 返回上一级
popToRootViewControllerAnimated: // 返回根视图(中间无论多少个视图都全部被出栈,没了)
// *@property**(**nonatomic**,**copy**)**NSArray** *viewControllers;**// The current view controller stack.*
// 通过*[**self**.**navigationController**.**viewControllers **objectAtIndex**:**n**] 来选定指定视图*
popToViewController:animated: // 返回指定视图
3.导航控制器提供已有的控件实现返回上一级(即被根视图推出的View都自带一个返回
代码示例:
@这里必须要说一下self.navigationController
// If this view controller has been pushed onto a navigation controller, return it.
~~~
- (void)viewDidLoad
{
[super viewDidLoad];
UIButton *push = [UIButton buttonWithType:UIButtonTypeSystem];
push.frame =CGRectMake(100, 100, 200, 200);
[push setTitle:@"下一页" forState:UIControlStateNormal];
[push addTarget:self action:@selector(pushNextController) forControlEvents:(UIControlEventTouchUpInside)];
[self.view addSubview:push];
// Do any additional setup after loading the view.
}
- (void)pushNextController{
NSLog(@"%@",self.navigationController);
HMTNext2ViewController * hmtNext2 = [[HMTNext2ViewController alloc]init];
[self.navigationController pushViewController:hmtNext2 animated:YES];
}
~~~