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

     // Override point for customization after application launch.

     // 启动后显示状态栏

     UIApplication *app = [UIApplication sharedApplication];

     app.statusBarHidden = NO;

     // 设置window

     self.window = [[UIWindow alloc] init];

     self.window.frame = [UIScreen mainScreen].bounds;

     /** 新版本特性 */

     // app现在的版本

     // 由于使用的时Core Foundation的东西，需要桥接

     NSString *versionKey = (__bridge NSString*) kCFBundleVersionKey;

     NSDictionary *infoDic = [[NSBundle mainBundle] infoDictionary];

     NSString *currentVersion = [infoDic objectForKey:versionKey];

     // 上次使用的版本

     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

     NSString *lastVersion = [defaults stringForKey:versionKey];

     // 如果版本变动了，存储新的版本号并启动新版本特性图

     if (![lastVersion isEqualToString:currentVersion]) {

         // 存储

         [defaults setObject:currentVersion forKey:versionKey];

         [defaults synchronize];

         // 开启app显示新特性

         HVWNewFeatureViewController *newFeatureVC = [[HVWNewFeatureViewController alloc] init];

         self.window.rootViewController = newFeatureVC;

     } else {

         // 创建根控制器

         HVWTabBarViewController *tabVC = [[HVWTabBarViewController alloc] init];

         self.window.rootViewController = tabVC;

     }

     [self.window makeKeyAndVisible];

     return YES;

 }

 //

 //  HVWNewFeatureViewController.m

 //  HVWWeibo

 //

 //  Created by hellovoidworld on 15/2/3.

 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.

 //

 #import "HVWNewFeatureViewController.h"

 #import "HVWTabBarViewController.h"

 #define NewFeatureCount 4

 @interface HVWNewFeatureViewController () <UIScrollViewDelegate>

 @property(nonatomic, strong) UIPageControl *pageControl;

 @end

 @implementation HVWNewFeatureViewController

 - (void)viewDidLoad {

     [super viewDidLoad];

     // Do any additional setup after loading the view.

     // 添加scrollView

     [self setupScrollView];

     // 添加pageControl

     [self setupPageControl];

 }

 /** 添加scrollView */

 - (void) setupScrollView {

     // 创建一个scrollView

     UIScrollView *scrollView = [[UIScrollView alloc] init];

     scrollView.frame = self.view.bounds;

     // 添加图片

     for (int i=; i<NewFeatureCount; i++) {

         // 获取图片

         NSString *featureImageName = [NSString stringWithFormat:@"new_feature_%d", i+];

         UIImageView *featureImageView = [[UIImageView alloc] initWithImage:[UIImage imageWithNamed:featureImageName]];

         // 设置图片尺寸位置

         CGFloat featureWidth = self.view.width;

         CGFloat featureHeight = self.view.height;

         CGFloat featureX = featureImageView.width * i;

         CGFloat featureY = ;

         featureImageView.frame = CGRectMake(featureX, featureY, featureWidth, featureHeight);

         // 如果是最后一页，加上功能按钮

         if (i == (NewFeatureCount - )) {

             // 为了让最后一页的的功能按钮能够生效，必须激活交互功能

             featureImageView.userInteractionEnabled = YES;

             [self addFunctionButton:featureImageView];

         }

         // 添加图片到scrollView

         [scrollView addSubview:featureImageView];

     }

     // 设置scrollView功能属性

     scrollView.userInteractionEnabled = YES;

     scrollView.scrollEnabled = YES; // 支持滚动

     scrollView.contentSize = CGSizeMake(self.view.width * NewFeatureCount, ); // 只需要水平滚动

     scrollView.pagingEnabled = YES; // 支持分页

     scrollView.showsHorizontalScrollIndicator = NO; // 隐藏水平滚动条

     // 设置背景色

     scrollView.backgroundColor = [UIColor colorWithRed:/255.0 green:/255.0 blue:/255.0 alpha:1.0];

     // 设置代理

     scrollView.delegate = self;

     // 添加

     [self.view addSubview:scrollView];

 }

 /** 添加pageControl */

 - (void) setupPageControl {

     // pageControl不能加在scrollView上，不然会随着内容一起滚动

     UIPageControl *pageControl = [[UIPageControl alloc] init];

     pageControl.pageIndicatorTintColor = [UIColor blackColor];

     pageControl.currentPageIndicatorTintColor = [UIColor redColor];

     pageControl.numberOfPages = NewFeatureCount;

     // 设置位置

     pageControl.centerX = self.view.width * 0.5;

     pageControl.centerY = self.view.height * 0.9;

     self.pageControl = pageControl;

     [self.view addSubview:pageControl];

 }

 #pragma mark - UIScrollViewDelegate

 /** scrollView滚动代理方法，在这里控制页码指示器 */

 - (void)scrollViewDidScroll:(UIScrollView *)scrollView {

     // 四舍五入，让图片滚动超过中线的时候改变页码

     self.pageControl.currentPage = scrollView.contentOffset.x / scrollView.width + 0.5;

 }

 #pragma mark - 最后一页的功能

 /** 添加功能按钮 */

 - (void) addFunctionButton:(UIImageView *) imageView {

     // 添加"分享"选项按钮

     [self addShareButton:imageView];

     // 添加"进入微博"按钮

     [self addEnterWeiboButton:imageView];

 }

 /** 分享选项按钮 */

 - (void) addShareButton:(UIImageView *) imageView  {

     // 创建按钮

     UIButton *shareButton = [UIButton buttonWithType:UIButtonTypeCustom];

     [shareButton setTitle:@"分享给大家" forState:UIControlStateNormal];

     [shareButton setImage:[UIImage imageWithNamed:@"new_feature_share_false"] forState:UIControlStateNormal];

     [shareButton setImage:[UIImage imageWithNamed:@"new_feature_share_true"] forState:UIControlStateSelected];

     [shareButton addTarget:self action:@selector(shareButtonClicked:) forControlEvents:UIControlEventTouchUpInside];

     [shareButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

     // 位置尺寸

     shareButton.size = CGSizeMake(, );

     // 必须先设置了size，center才真的在中心，不然就是从左上角开始!!!

     shareButton.centerX = self.view.width * 0.5;

     shareButton.centerY = self.view.height * 0.65;

     // 设置内间距

     shareButton.titleEdgeInsets = UIEdgeInsetsMake(, 10.0, , );

     // 添加

     [imageView addSubview:shareButton];

 }

 /** 分享选项点击事件方法 */

 - (void) shareButtonClicked:(UIButton *) button {

     button.selected = !button.selected;

 }

 /** “进入微博"按钮 */

 - (void) addEnterWeiboButton:(UIImageView *) imageView  {

     // 创建按钮

     UIButton *enterButton = [UIButton buttonWithType:UIButtonTypeCustom];

     enterButton.userInteractionEnabled = YES;

     [enterButton setBackgroundImage:[UIImage imageWithNamed:@"new_feature_finish_button"] forState:UIControlStateNormal];

     [enterButton setBackgroundImage:[UIImage imageWithNamed:@"new_feature_finish_button_highlighted"] forState:UIControlStateHighlighted];

     [enterButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

     [enterButton setTitle:@"进入微博" forState:UIControlStateNormal];

     // 位置尺寸

     enterButton.size = enterButton.currentBackgroundImage.size;

     enterButton.centerX = self.view.width * 0.5;

     enterButton.centerY = self.view.height * 0.8;

     // 监听点击

     [enterButton addTarget:self action:@selector(enterWeiboButtonClicked) forControlEvents:UIControlEventTouchUpInside];

     // 添加

     [imageView addSubview:enterButton];

 }

 /** “进入微博” 按钮点击 */

 - (void) enterWeiboButtonClicked {

     UIWindow *window = [UIApplication sharedApplication].keyWindow;

     window.rootViewController = [[HVWTabBarViewController alloc] init];

 }

 @end