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在我们做程序维护和版本迭代工作中,我们经常会做新特性界面(闪屏页过后的引导界面),做新特性界面的逻辑思维就是在App被初次下载或版本升级之后才出现,一般到新特性界面的最后一页用户点击立即体验后,跳转到之前的业务逻辑界面,即未注册登录过的用户跳转到注册登录界面,登录过的用户,跳转到用户之前登录过停留的界面.

案例:

• 判断应用的版本号是否更新

 ///  判断是否是新版本
 - (BOOL)isNewVersion{

 //获取Bundle文件夹下应用当前版本号
NSDictionary *infoDictionary = [NSBundle mainBundle].infoDictionary;
NSString *currentVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
 
 //偏好设置中获取上一次版本号
NSString *sandboxKey = @"sandboxKey";
NSString *sandboxVersion = [[NSUserDefaults standardUserDefaults]stringForKey:sandboxKey];
BOOL isNew = ![currentVersion isEqualToString:sandboxVersion];

 //如果是新版本号 保存到偏好设置
if (isNew) {
    [[NSUserDefaults standardUserDefaults] setObject:currentVersion forKey:sandboxKey];
    [[NSUserDefaults standardUserDefaults]synchronize];
}

return isNew;
}

• 在AppDelegate的didFinishLaunching里调用判断版本号是否更新方法 如果是跳到新特性控制器如果不是还走原来的业务逻辑.
  //判断是否是新版本 如果是则跳到新特性界面(视频导航页)
  if ([self isNewVersion]) {
  self.window.rootViewController = [[RTNewFeatureViewController alloc]init];
  }
  //如果不是新版本,根据自己的业务需求 提供一个方法确定window的根控制器
  [self switchWindowRootViewController];

• 自定义新特性控制器
  @interface RTNewFeatureViewController () <RTNewFeatureCellDelegate,UICollectionViewDelegate,UICollectionViewDataSource>
  //流水布局
  @property (nonatomic, strong) UICollectionViewFlowLayout *layout;
  @property (nonatomic, strong) UICollectionView *collectionView;
  @property (nonatomic, strong) UIPageControl *pageControl;
  @end

   @implementation RTNewFeatureViewController
  
   static NSString * const reuseIdentifier = @"RTNewFeatureCell";
  
   - (void)viewDidLoad {
         [super viewDidLoad];
         [self prepareForUI];
         [[UIApplication sharedApplication]setStatusBarHidden:YES];
      }
  
    - (void)prepareForUI{
        [self.view addSubview:self.collectionView];
        [self.view addSubview:self.pageControl];
  
        [self.pageControl mas_makeConstraints:^(MASConstraintMaker *make) {
           make.bottom.equalTo(self.view).offset(-15);
           make.centerX.equalTo(self.view);
        }];
  
        self.collectionView.delegate = self;
        self.collectionView.dataSource = self;
        self.collectionView.pagingEnabled = YES;
        self.collectionView.bounces = NO;
        self.collectionView.showsHorizontalScrollIndicator = NO;
        self.layout.itemSize = [UIScreen mainScreen].bounds.size;
        self.layout.minimumInteritemSpacing = 0;
        self.layout.minimumLineSpacing = 0;
        self.layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
  
       [self.collectionView registerClass:[RTNewFeatureCell class]  forCellWithReuseIdentifier:reuseIdentifier];
  
     }
  
       #pragma mark - UICollectionViewDataSource && DataSource
  
      - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
  
        return 2;
    }
  
   - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView      cellForItemAtIndexPath:(NSIndexPath *)indexPath {
          RTNewFeatureCell  *cell = [collectionView  dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
          cell.index = (int)indexPath.row;
          cell.delegate = self;
          return cell;
  }
  
       #pragma mark - RTNewFeatureCellDelegate
  
        ///  按钮点击事件
   -(void)cellButtonDidClick:(RTNewFeatureCell *)cell
      {
         AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
         NSIndexPath *indexPath = [self.collectionView indexPathForCell:cell];
         if (indexPath.row) {
                //跳转到开始体验页
               appDelegate.window.rootViewController = nil;
               [[UIApplication sharedApplication]setStatusBarHidden:NO];
               [appDelegate switchWindowRootViewController];
  
        }else{
                  //跳转到百度
            NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
           [[UIApplication sharedApplication]openURL:url];
       }
  
     }
  
      ///  set pageControl
  - (void)scrollViewDidScroll:(UIScrollView *)scrollView
   {
         if(scrollView.contentOffset.x > [UIScreen mainScreen].bounds.size.width/2)
      {
           self.pageControl.currentPage = 1;
     }else{
           self.pageControl.currentPage = 0;
     }   
  }
  
     #pragma mark - lazyLoad
  
  - (UIPageControl *)pageControl
  {
       if (_pageControl == nil) {
           _pageControl = [[UIPageControl alloc]init];
           _pageControl.numberOfPages = 2;
           _pageControl.pageIndicatorTintColor = kRTColorWithHEX(0xC9C9C9, 1);
           _pageControl.currentPageIndicatorTintColor = kRTColorWithHEX(0xF88558, 1);
    }
          return _pageControl;
  }
  
  - (UICollectionView *)collectionView
   {
        if (_collectionView == nil) {
  
               _collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0,  self.view.bounds.size.width, self.view.bounds.size.height)  collectionViewLayout:self.layout];
  _collectionView.backgroundColor = [UIColor brownColor];
  
   }
        return _collectionView;
  }
  
    -(UICollectionViewFlowLayout *)layout
    {
           if (_layout == nil) {
                UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc]init];
                self.layout = layout;
           }
         return _layout;
    }
  

改变一下版本号测试一下：

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