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。