【iOS】present和push

网络投稿 02-07 5084

present和push present和dismiss使用方法特点 push和pop使用方法特点 demo

present和dismiss 使用方法

使用一般的视图控制器用present方法：

[self presentViewController:xxx animated:BOOL completion:nil];

返回时用dismiss：

[self dismissViewControllerAnimated:BOOL completion:nil]; 特点使用present来呈现视图，弹出的视图时模态视图，属于临时呈现（present）一个视图，要返回的话只能逐级返回。present一般用于不同业务界面的切换。 push和pop 使用方法

使用push和pop首先需要让你的viewController的navigationController属性不为空，否则push/pop是无效的。所以说要先把你的第一个controller的navigation属性初始化

如何初始化NavigationController出来？在SceneDelegate.m中：

这里我的MainViewController的viewController就可以随意的push/pop了！

回到正题。使用UINavigationController时使用push方法：

[self.navigationController pushViewController:xxx animated:BOOL];

返回时使用pop方法：

[self.navigationController popViewControllerAnimated:BOOL];

pop由于是视图栈管理，可选择返回之前的任一级：

//返回根控制器 [self.navigationController popToRootViewControllerAnimated:YES]; //返回到指定控制器 [self.navigationController popToViewController: SecondViewController animated:YES]; 特点使用push，其所有视图都由视图栈来控制，可以选择返回上一级，也可以直接选择返回根视图控制器，或是其他viewController。push一般用于同一业务不同界面的切换。执行完push后会在下个界面navigation的left bar自动添加back按钮，它的响应方法就是返回，所以一般不需要写返回方法，点back按钮即可。 demo

viewController.m

#import "ViewController.h" #import "MainViewController.h" #import "FirstViewController.h" #import "SecondViewController.h" #import "ThirdViewController.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. self.view.backgroundColor = [UIColor cyanColor]; UIButton* buttonStart = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [buttonStart setTitle:@"present进入" forState:UIControlStateNormal]; [buttonStart addTarget:self action:@selector(startMainView) forControlEvents:UIControlEventTouchUpInside]; buttonStart.frame = CGRectMake(100, 300, 100, 50); [self.view addSubview:buttonStart]; } - (void) startMainView { FirstViewController* firstController = [[FirstViewController alloc] init] ; SecondViewController* secondController = [[SecondViewController alloc] init] ; ThirdViewController* thirdController = [[ThirdViewController alloc] init] ; firstController.title = @"first"; secondController.title = @"首页"; thirdController.title = @"Third"; UINavigationController* navFirst = [[UINavigationController alloc] initWithRootViewController:firstController] ; UINavigationController* navSecond = [[UINavigationController alloc] initWithRootViewController:secondController] ; UINavigationController* navThird = [[UINavigationController alloc] initWithRootViewController:thirdController] ; //使导航栏上方不留白，并设置颜色 UINavigationBarAppearance* appear = [UINavigationBarAppearance new] ; [appear configureWithOpaqueBackground] ; appear.backgroundColor = [UIColor orangeColor] ; appear.shadowColor = [UIColor clearColor] ; navFirst.navigationBar.barTintColor = [UIColor linkColor]; navFirst.navigationBar.standardAppearance = appear ; navFirst.navigationBar.scrollEdgeAppearance = navFirst.navigationBar.standardAppearance ; navSecond.navigationBar.standardAppearance = appear ; navSecond.navigationBar.scrollEdgeAppearance = navFirst.navigationBar.standardAppearance ; navThird.navigationBar.standardAppearance = appear ; navThird.navigationBar.scrollEdgeAppearance = navFirst.navigationBar.standardAppearance ; //准备用来初始化tbc的array NSArray* array = [NSArray arrayWithObjects:navFirst, navSecond, navThird, nil]; UITabBarController* tabBarController = [[UITabBarController alloc]init]; //tbc的viewControllers属性被赋值 tabBarController.viewControllers = array; //设置颜色 tabBarController.view.backgroundColor = [UIColor whiteColor]; //设置分栏的透明度 tabBarController.tabBar.translucent = NO; //设置风格 tabBarController.modalPresentationStyle = UIModalPresentationFullScreen ; tabBarController.selectedIndex = 1; [self presentViewController:tabBarController animated:NO completion:nil]; } @end

MainViewController.m

#import "MainViewController.h" @interface MainViewController () @end @implementation MainViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. self.view.backgroundColor = [UIColor yellowColor]; UILabel* label = [[UILabel alloc]initWithFrame:CGRectMake(30, 200, 300, 100)]; label.text = @"There is the message that is written by zsy"; [label setLineBreakMode:NSLineBreakByWordWrapping];//设置换行模式 label.numberOfLines = 0;//设置label行数，表示可多行显示 [self.view addSubview:label]; }

SecondViewController.m

#import "SecondViewController.h" #import "MainViewController.h" @interface SecondViewController () @end @implementation SecondViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. UIButton* buttonReturn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; buttonReturn.frame = CGRectMake(100, 300, 100, 50); [buttonReturn setTitle:@"dismiss返回" forState:UIControlStateNormal]; [buttonReturn addTarget:self action:@selector(returnView) forControlEvents:UIControlEventTouchUpInside]; UIButton* buttonNext = [UIButton buttonWithType:UIButtonTypeRoundedRect]; buttonNext.frame = CGRectMake(100, 500, 100, 50); [buttonNext setTitle:@"push进入" forState:UIControlStateNormal]; [buttonNext addTarget:self action:@selector(getInNext) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:buttonNext]; [self.view addSubview:buttonReturn]; } /* #pragma mark - Navigation // In a storyboard-based application, you will often want to do a little preparation before navigation - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { // Get the new view controller using [segue destinationViewController]. // Pass the selected object to the new view controller. } */ - (void) returnView { [self dismissViewControllerAnimated:NO completion:nil]; } - (void) getInNext { MainViewController* mainController = [[MainViewController alloc]init]; mainController.modalPresentationStyle = UIModalPresentationFullScreen; [mainController setTitle:@"内容"]; [self.navigationController pushViewController:mainController animated:YES]; } @end

点击button，用present的方法进入主页面(这里我设置了 tabBarController.selectedIndex = 1;所以先进入SecondViewController)：

点击push进入按钮，用push的方法进入MainViewController的View。。。这里没有设置返回按钮，但系统自动生成了一个导航栏的左按钮，点击事件为pop回上一级，点击后返回： first、third：