iOS开发之应用首次启动显示用户引导

这个功能的重点就是在如何判断应用是第一次启动的. 其实很简单

我们只需要在一个类里面写好用户引导页面  基本上都是使用UIScrollView 来实现,

新建一个继承于UIViewController的类 命名为 UserGuideViewController ,

在UserGuideViewController.m 写

1 - (void)viewDidLoad
 2 {
 3     [super viewDidLoad];
 4     // Do any additional setup after loading the view.
 5     self.view.backgroundColor = [UIColor redColor];
 6    
 7     [self initGuide];   //加载新用户指导页面
 8 }
 9
10 - (void)initGuide
11 {
12     UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 640)];
13     [scrollView setContentSize:CGSizeMake(1280, 0)];
14     [scrollView setPagingEnabled:YES];  //视图整页显示
15     //    [scrollView setBounces:NO]; //避免弹跳效果,避免把根视图露出来
16    
17     UIImageView *imageview = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
18     [imageview setImage:[UIImage imageNamed:@"0.png"]];
19     [scrollView addSubview:imageview];
20     [imageview release];
21    
22     UIImageView *imageview1 = [[UIImageView alloc] initWithFrame:CGRectMake(320, 0, 320, 460)];
23     [imageview1 setImage:[UIImage imageNamed:@"1.png"]];
24     [scrollView addSubview:imageview1];
25     [imageview1 release];
26    
27     UIImageView *imageview2 = [[UIImageView alloc] initWithFrame:CGRectMake(640, 0, 320, 460)];
28     [imageview2 setImage:[UIImage imageNamed:@"2.png"]];
29     [scrollView addSubview:imageview2];
30     [imageview2 release];
31    
32     UIImageView *imageview3 = [[UIImageView alloc] initWithFrame:CGRectMake(960, 0, 320, 460)];
33     [imageview3 setImage:[UIImage imageNamed:@"3.png"]];
34     imageview3.userInteractionEnabled = YES;    //打开imageview3的用户交互;否则下面的button无法响应
35     [scrollView addSubview:imageview3];
36     [imageview3 release];
37    
38     UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];//在imageview3上加载一个透明的button
39     [button setTitle:nil forState:UIControlStateNormal];
40     [button setFrame:CGRectMake(46, 371, 230, 37)];
41     [button addTarget:self action:@selector(firstpressed) forControlEvents:UIControlEventTouchUpInside];
42     [imageview3 addSubview:button];
43    
44     [self.view addSubview:scrollView];
45     [scrollView release];
46 }
button的方法

1 - (void)firstpressed
2 {
3     [self presentModalViewController:[[[WeiBoViewController alloc] init] autorelease] animated:YES];  //点击button跳转到根视图
4 }

至于添加button是因为我的用户引导最后一个页面有一个画上去的button,写着 开始使用  我在上面添加一个透明的button 用以实现调用方法

打开AppDelegate.m

首先引入头文件

1 #import "UserGuideViewController.h"
2 #import "WeiBoViewController.h"
WeiBoViewController是我的根视图application: didFinishLaunchingWithOptions: 方法内进行判断

1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 2 {
 3     self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
 4     // Override point for customization after application launch.
 5    
 6     //判断是不是第一次启动应用
 7     if(![[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"])
 8     {
 9         [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstLaunch"];
10         NSLog(@"第一次启动");       
11         //如果是第一次启动的话,使用UserGuideViewController (用户引导页面) 作为根视图
12         UserGuideViewController *userGuideViewController = [[UserGuideViewController alloc] init];
13         self.window.rootViewController = userGuideViewController;
14         [userGuideViewController release];
15     }
16     else
17     {
18         NSLog(@"不是第一次启动");
19         //如果不是第一次启动的话,使用LoginViewController作为根视图
20         WeiBoViewController *weiBoViewController = [[WeiBoViewController alloc] init];
21         self.window.rootViewController = weiBoViewController;
22         [weiBoViewController release];
23
24     }
25    
26     self.window.backgroundColor = [UIColor whiteColor];
27     [self.window makeKeyAndVisible];
28     return YES;
29 }