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：

 #import "AppDelegate.h"
 #import "MainViewController.h"

 @interface AppDelegate ()

 @end

 @implementation AppDelegate

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

 //   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

 //    创建window，设置背景色
     self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
     self.window.backgroundColor = [UIColor colorWithRed:0.638 green:0.876 blue:1.000 alpha:1.000];
 //    让当前window称为主窗口
     [self.window makeKeyAndVisible];

 //    设置window的根视图
     MainViewController *mainVC = [[MainViewController alloc]init];

 //    设置导航控制器的根视图为mainviewcontroller类的实例mainVC
     UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:mainVC];

 //    设置window的根视图为nav
     self.window.rootViewController = nav;

 //    给导航栏着色
     nav.navigationBar.barTintColor = [UIColor colorWithRed:1.000 green:0.400 blue:1.000 alpha:1.000];

 //    给导航栏添加图片
     [nav.navigationBar setBackgroundImage:[UIImage imageNamed:@"barimage"] forBarMetrics:UIBarMetricsDefault];

     return YES;
 }

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：

 #import "MainViewController.h"
 #import "FirstViewController.h"
 @interface MainViewController ()

 @end

 @implementation MainViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

 //    设置标题
 //    self.navigationItem.title = @"微信";

 //    设置按钮
     UIButton *btn1 = [[UIButton alloc]initWithFrame:CGRectMake(, , , )];
     btn1.backgroundColor = [UIColor redColor];
     [btn1 addTarget:self action:@selector(gotofirst) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:btn1];

 //    自定义标题（按钮、可点击）
     UIButton *titlebtn = [UIButton buttonWithType:UIButtonTypeCustom];
     titlebtn.frame = CGRectMake(, , , );
     [titlebtn setTitle:@"我可以点击" forState: UIControlStateNormal];
     [titlebtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
     titlebtn.titleLabel.font = [UIFont systemFontOfSize:];
     [titlebtn addTarget:self action:@selector(titlebtnAction) forControlEvents:UIControlEventTouchUpInside];
     self.navigationItem.titleView = titlebtn;

 //    自定义左、右按键
     UIBarButtonItem *leftItem = [[UIBarButtonItem alloc]initWithTitle:@"左边" style:UIBarButtonItemStylePlain target:self action:@selector(leftItemAction)];

     UIBarButtonItem *rightItem = [[UIBarButtonItem alloc]initWithTitle:@"右边" style:UIBarButtonItemStylePlain target:self action:@selector(rightItemAction)];

 //    self.navigationItem.leftBarButtonItem = leftItem;
 //    self.navigationItem.rightBarButtonItem = rightItem;

 //    使用数组给右边添加多个按钮
     self.navigationItem.rightBarButtonItems = @[leftItem,rightItem];

 }

 -(void)rightItemAction{
      NSLog(@"右边按钮被点击了");
 }

 -(void)leftItemAction{
     NSLog(@"左边按钮被点击了");
 }

 -(void)gotofirst{
     FirstViewController *firstVC = [[FirstViewController alloc]init];
     [self.navigationController pushViewController:firstVC animated:YES];

 }
 -(void)titlebtnAction{
     NSLog(@"我被点击了");
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 /*
 #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.
 }
 */

 @end

新建FirstViewController类，然后在FirstViewController.m中添加以下代码：

 #import "FirstViewController.h"
 #import "MainViewController.h"

 @interface FirstViewController ()

 @end

 @implementation FirstViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.view.backgroundColor = [UIColor blackColor];

     //    设置按钮
     UIButton *btn1 = [[UIButton alloc]initWithFrame:CGRectMake(, , , )];
     btn1.backgroundColor = [UIColor redColor];
     [btn1 addTarget:self action:@selector(goback) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:btn1];
 }

 -(void)goback{

 //按指定返回
 ////    返回根视图
 //    [self.navigationController popToRootViewControllerAnimated:YES];
 //
 ////    返回上一个视图
 //    [self.navigationController popViewControllerAnimated:YES];

 //通过循环比较返回
     for (UIViewController *tmp in self.navigationController.viewControllers) {
         if ([tmp isKindOfClass:[MainViewController class]]) {
             [self.navigationController popToViewController:tmp animated:YES];
         }
     }

 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 /*
 #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.
 }
 */

 @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。