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