IOS开发－UI学习－UINavigationController（导航控制器）的使用
UINavigationController是IOS 中常用的功能，基本用法如下：
1、在AppDelegate.m中添加如下代码：
1 #import "AppDelegate.h" 2 #import "MainViewController.h" 3 4 @interface AppDelegate () 5 6 @end 7 8 @implementation AppDelegate 9 10 11 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 12 13 14 // 注意：如果保留storyboard中的viewcontroller的话，就不用第16行到20行的创建window的语句 15 16 // 创建window，设置背景色 17 self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds]; 18 self.window.backgroundColor = [UIColor colorWithRed:0.638 green:0.876 blue:1.000 alpha:1.000]; 19 // 让当前window称为主窗口 20 [self.window makeKeyAndVisible]; 21 22 23 24 25 // 设置window的根视图 26 MainViewController *mainVC = [[MainViewController alloc]init]; 27 28 // 设置导航控制器的根视图为mainviewcontroller类的实例mainVC 29 UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:mainVC]; 30 31 // 设置window的根视图为nav 32 self.window.rootViewController = nav; 33 34 35 // 给导航栏着色 36 nav.navigationBar.barTintColor = [UIColor colorWithRed:1.000 green:0.400 blue:1.000 alpha:1.000]; 37 38 // 给导航栏添加图片 39 [nav.navigationBar setBackgroundImage:[UIImage imageNamed:@"barimage"] forBarMetrics:UIBarMetricsDefault]; 40 41 42 43 44 return YES; 45 }
注意：使用以上功能时先在Main.storyboard中删除viewcontroller，然后添加十六到二十行语句，如果不删除Main.storyboard中的viewcontroller的话，就不需要使用十六到二十行多语句来添加window。
新建MainViewController类，继承自UIViewController，然后在MainViewController.m中添加以下代码：
1 #import "MainViewController.h" 2 #import "FirstViewController.h" 3 @interface MainViewController () 4 5 @end 6 7 @implementation MainViewController 8 9 - (void)viewDidLoad { 10 [super viewDidLoad]; 11 12 // 设置标题 13 // self.navigationItem.title = @"微信"; 14 15 // 设置按钮 16 UIButton *btn1 = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)]; 17 btn1.backgroundColor = [UIColor redColor]; 18 [btn1 addTarget:self action:@selector(gotofirst) forControlEvents:UIControlEventTouchUpInside]; 19 [self.view addSubview:btn1]; 20 21 22 // 自定义标题（按钮、可点击） 23 UIButton *titlebtn = [UIButton buttonWithType:UIButtonTypeCustom]; 24 titlebtn.frame = CGRectMake(0, 0, 100, 44); 25 [titlebtn setTitle:@"我可以点击" forState: UIControlStateNormal]; 26 [titlebtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; 27 titlebtn.titleLabel.font = [UIFont systemFontOfSize:16]; 28 [titlebtn addTarget:self action:@selector(titlebtnAction) forControlEvents:UIControlEventTouchUpInside]; 29 self.navigationItem.titleView = titlebtn; 30 31 32 // 自定义左、右按键 33 UIBarButtonItem *leftItem = [[UIBarButtonItem alloc]initWithTitle:@"左边" style:UIBarButtonItemStylePlain target:self action:@selector(leftItemAction)]; 34 35 UIBarButtonItem *rightItem = [[UIBarButtonItem alloc]initWithTitle:@"右边" style:UIBarButtonItemStylePlain target:self action:@selector(rightItemAction)]; 36 37 // self.navigationItem.leftBarButtonItem = leftItem; 38 // self.navigationItem.rightBarButtonItem = rightItem; 39 40 // 使用数组给右边添加多个按钮 41 self.navigationItem.rightBarButtonItems = @[leftItem,rightItem]; 42 43 44 45 46 47 } 48 49 -(void)rightItemAction{ 50 NSLog(@"右边按钮被点击了"); 51 } 52 53 54 -(void)leftItemAction{ 55 NSLog(@"左边按钮被点击了"); 56 } 57 58 -(void)gotofirst{ 59 FirstViewController *firstVC = [[FirstViewController alloc]init]; 60 [self.navigationController pushViewController:firstVC animated:YES]; 61 62 } 63 -(void)titlebtnAction{ 64 NSLog(@"我被点击了"); 65 } 66 67 68 69 - (void)didReceiveMemoryWarning { 70 [super didReceiveMemoryWarning]; 71 // Dispose of any resources that can be recreated. 72 } 73 74 /* 75 #pragma mark - Navigation 76 77 // In a storyboard-based application, you will often want to do a little preparation before navigation 78 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 79 // Get the new view controller using [segue destinationViewController]. 80 // Pass the selected object to the new view controller. 81 } 82 */ 83 84 @end
新建FirstViewController类，然后在FirstViewController.m中添加以下代码：
1 #import "FirstViewController.h" 2 #import "MainViewController.h" 3 4 @interface FirstViewController () 5 6 @end 7 8 @implementation FirstViewController 9 10 - (void)viewDidLoad { 11 [super viewDidLoad]; 12 13 self.view.backgroundColor = [UIColor blackColor]; 14 15 16 17 // 设置按钮 18 UIButton *btn1 = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)]; 19 btn1.backgroundColor = [UIColor redColor]; 20 [btn1 addTarget:self action:@selector(goback) forControlEvents:UIControlEventTouchUpInside]; 21 [self.view addSubview:btn1]; 22 } 23 24 25 -(void)goback{ 26 27 //按指定返回 28 //// 返回根视图 29 // [self.navigationController popToRootViewControllerAnimated:YES]; 30 // 31 //// 返回上一个视图 32 // [self.navigationController popViewControllerAnimated:YES]; 33 34 35 36 //通过循环比较返回 37 for (UIViewController *tmp in self.navigationController.viewControllers) { 38 if ([tmp isKindOfClass:[MainViewController class]]) { 39 [self.navigationController popToViewController:tmp animated:YES]; 40 } 41 } 42 43 44 } 45 46 47 - (void)didReceiveMemoryWarning { 48 [super didReceiveMemoryWarning]; 49 // Dispose of any resources that can be recreated. 50 } 51 52 /* 53 #pragma mark - Navigation 54 55 // In a storyboard-based application, you will often want to do a little preparation before navigation 56 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 57 // Get the new view controller using [segue destinationViewController]. 58 // Pass the selected object to the new view controller. 59 } 60 */ 61 62 @end
通过以上代码就可以实现两个viewcontroller的切换，是通过导航控制器实现的。
