实现软件版本新特性的具体步奏

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<span style="color: rgb(0, 0, 255);">- (void)setupScrollView

{

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

    scrollView.frame = self.view.bounds;

    scrollView.delegate
= self;

    [self.view addSubview:scrollView];

    // 2.添加图片

    CGFloat imageW = scrollView.frame.size.width;

    CGFloat imageH = scrollView.frame.size.height;

    for
(int
index = 0; index<IWNewfeatureImageCount; index++) {

        UIImageView *imageView = [[UIImageView alloc] init];

        // 设置图片

        NSString *name = [NSString stringWithFormat:@"new_feature_%d", index + 1];

        imageView.image = [UIImage imageWithName:name];

        // 设置frame

        CGFloat imageX = index * imageW;

        imageView.frame = CGRectMake(imageX, 0, imageW, imageH);

        [scrollView addSubview:imageView];

        // 在最后一个图片上面添加按钮

        if
(index == IWNewfeatureImageCount - 1) {

            [self setupLastImageView:imageView];

        }

    }

    // 3.设置滚动的内容尺寸

    scrollView.contentSize = CGSizeMake(imageW * IWNewfeatureImageCount, 0);

   // 取消水平滚动条 scrollView.showsHorizontalScrollIndicator = NO；

    scrollView.pagingEnabled = YES;

// 取消滚动的弹簧效果  

  scrollView.bounces = NO;

}

</span>

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// 1.添加

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

    pageControl.numberOfPages = IWNewfeatureImageCount;

    CGFloat centerX = self.view.frame.size.width * 0.5;

    CGFloat centerY = self.view.frame.size.height - 30;

    pageControl.center = CGPointMake(centerX, centerY);

    pageControl.bounds = CGRectMake(0, 0, 100, 30);

    pageControl.userInteractionEnabled = NO;

    [self.view addSubview:pageControl];

    self.pageControl = pageControl;

    // 2.设置圆点的颜色

    pageControl.currentPageIndicatorTintColor = IWColor(253, 98, 42);

    pageControl.pageIndicatorTintColor = IWColor(189, 189, 189);

②求出分页的页码，需要使用UIScrollView的代理，使用代理方法

/**

 *  只要UIScrollView滚动了,就会调用

 *

 */

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

    // 1.取出水平方向上滚动的距离

    CGFloat offsetX = scrollView.contentOffset.x;

    // 2.求出页码

    double
pageDouble = offsetX / scrollView.frame.size.width;

    int
pageInt = (int)(pageDouble + 0.5);

    self.pageControl.currentPage = pageInt;

}

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- (void)setupLastImageView:(UIImageView *)imageView

{

    // 0.让imageView能跟用户交互

    imageView.userInteractionEnabled = YES;

    // 1.添加开始按钮

    UIButton *startButton = [[UIButton alloc] init];

    [startButton setBackgroundImage:[UIImage imageWithName:@"new_feature_finish_button"] forState:UIControlStateNormal];

    [startButton setBackgroundImage:[UIImage imageWithName:@"new_feature_finish_button_highlighted"] forState:UIControlStateHighlighted];

    // 2.设置frame

    CGFloat centerX = imageView.frame.size.width * 0.5;

    CGFloat centerY = imageView.frame.size.height * 0.6;

    startButton.center = CGPointMake(centerX, centerY);

    startButton.bounds = (CGRect){CGPointZero, startButton.currentBackgroundImage.size};

    // 3.设置文字

    [startButton setTitle:@"开始使用"
forState:UIControlStateNormal];

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

    [startButton addTarget:self
action:@selector(start) forControlEvents:UIControlEventTouchUpInside];

    [imageView addSubview:startButton];

    // 4.添加checkbox

    UIButton *checkbox = [[UIButton alloc] init];

    checkbox.selected = YES;

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

    [checkbox setImage:[UIImage imageWithName:@"new_feature_share_false"] forState:UIControlStateNormal];

    [checkbox setImage:[UIImage imageWithName:@"new_feature_share_true"] forState:UIControlStateSelected];

    checkbox.bounds = CGRectMake(0, 0, 200, 50);

    CGFloat checkboxCenterX = centerX;

    CGFloat checkboxCenterY = imageView.frame.size.height * 0.5;

    checkbox.center = CGPointMake(checkboxCenterX, checkboxCenterY);

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

    checkbox.titleLabel.font = [UIFont systemFontOfSize:15];

    [checkbox addTarget:self
action:@selector(checkboxClick:) forControlEvents:UIControlEventTouchUpInside];

    checkbox.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 10);

    [imageView addSubview:checkbox];

}

④点击开始使用时候，切换根控制器

- (void)start

{

    // 显示状态栏

    [UIApplication sharedApplication].statusBarHidden = NO;

    // 切换窗口的根控制器

    self.view.window.rootViewController = [[IWTabBarViewController alloc] init];

}

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NSString
*key = @"CFBundleVersion";

   // 取出沙盒中存储的上次使用软件的版本号

   NSUserDefaults
*defaults = [NSUserDefaults
standardUserDefaults];

   NSString
*lastVersion = [defaults stringForKey:key];

   // 获得当前软件的版本号

   NSString
*currentVersion = [NSBundle
mainBundle].infoDictionary[key];

   if
([currentVersion isEqualToString:lastVersion]) {

       // 显示状态栏

       application.statusBarHidden = NO;

       self.window.rootViewController = [[IWTabBarViewController alloc] init];

   } else
{ // 新版本

       self.window.rootViewController = [[IWNewfeatureViewController alloc] init];

       // 存储新版本

       [defaults setObject:currentVersion forKey:key];

       [defaults synchronize];

   }