103添加或删除屏幕中的翻页数目

效果如下：

ViewController.h

1 #import <UIKit/UIKit.h>

2 

3 @interface ViewController : UIViewController

4 @property (strong, nonatomic) UIPageControl *pageCCustom;

5 

6 @end

ViewController.m

 1 #import "ViewController.h"

 2 

 3 @interface ViewController ()

 4 - (void)layoutUI;

 5 - (void)loadNavigation;

 6 - (void)pageControlDidChange:(UIPageControl *)sender;

 7 - (void)addDidPush:(UIBarButtonItem *)sender;

 8 - (void)delDidPush:(UIBarButtonItem *)sender;

 9 @end

10 

11 @implementation ViewController

12 

13 - (void)viewDidLoad {

14     [super viewDidLoad];

15     

16     [self layoutUI];

17 }

18 

19 - (void)didReceiveMemoryWarning {

20     [super didReceiveMemoryWarning];

21     // Dispose of any resources that can be recreated.

22 }

23 

24 - (void)viewWillAppear:(BOOL)animated {

25     [super viewWillAppear:animated];

26     [self.navigationController setNavigationBarHidden:NO animated:animated];

27     [self.navigationController setToolbarHidden:NO animated:animated];

28 }

29 

30 - (void)layoutUI {

31     [self loadNavigation];

32     

33     _pageCCustom = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 0, 320, 100)];

34     _pageCCustom.center = self.view.center;

35     _pageCCustom.backgroundColor = [UIColor brownColor];

36     _pageCCustom.numberOfPages = 3;

37     _pageCCustom.currentPage = 0;

38     [_pageCCustom addTarget:self

39                      action:@selector(pageControlDidChange:)

40            forControlEvents:UIControlEventValueChanged];

41     [self.view addSubview:_pageCCustom];

42 }

43 

44 - (void)loadNavigation {

45     self.navigationItem.title = @"添加或删除屏幕中的翻页数目";

46     self.view.backgroundColor = [UIColor whiteColor];

47     UIBarButtonItem *barBtnBarAdd =

48     [[UIBarButtonItem alloc] initWithTitle:@"添加新页"

49                                      style:UIBarButtonItemStyleDone

50                                     target:self

51                                     action:@selector(addDidPush:)];

52     UIBarButtonItem *barBtnDel =

53     [[UIBarButtonItem alloc] initWithTitle:@"删除旧页"

54                                      style:UIBarButtonItemStyleDone

55                                     target:self

56                                     action:@selector(delDidPush:)];

57     [self setToolbarItems:@[barBtnBarAdd, barBtnDel]];

58 }

59 - (void)pageControlDidChange:(UIPageControl *)sender {

60     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示信息"

61                                                     message:[NSString stringWithFormat:@"currentPage=%ld", (long)sender.currentPage]

62                                                    delegate:self

63                                           cancelButtonTitle:nil

64                                           otherButtonTitles:@"确定", nil];

65     [alert show];

66 }

67 

68 - (void)addDidPush:(UIBarButtonItem *)sender {

69     if (_pageCCustom.numberOfPages < 10) {

70         _pageCCustom.numberOfPages++;

71     }

72 }

73 

74 - (void)delDidPush:(UIBarButtonItem *)sender {

75     if (_pageCCustom.numberOfPages > 1) {

76         _pageCCustom.numberOfPages--;

77         [self pageControlDidChange:_pageCCustom];

78     }

79 }

80 

81 @end

AppDelegate.h

1 #import <UIKit/UIKit.h>

2 

3 @interface AppDelegate : UIResponder <UIApplicationDelegate>

4 @property (strong, nonatomic) UIWindow *window;

5 @property (strong, nonatomic) UINavigationController *navigationController;

6 

7 @end

AppDelegate.m

 1 #import "AppDelegate.h"

 2 #import "ViewController.h"

 3 

 4 @interface AppDelegate ()

 5 @end

 6 

 7 @implementation AppDelegate

 8 

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

10     _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

11     ViewController *viewController = [[ViewController alloc] init];

12     _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];

13     _window.rootViewController = _navigationController;

14     //[_window addSubview:_navigationController.view]; //当_window.rootViewController关联时，这一句可有可无

15     [_window makeKeyAndVisible];

16     return YES;

17 }

18 

19 - (void)applicationWillResignActive:(UIApplication *)application {

20 }

21 

22 - (void)applicationDidEnterBackground:(UIApplication *)application {

23 }

24 

25 - (void)applicationWillEnterForeground:(UIApplication *)application {

26 }

27 

28 - (void)applicationDidBecomeActive:(UIApplication *)application {

29 }

30 

31 - (void)applicationWillTerminate:(UIApplication *)application {

32 }

33 

34 @end