版本新特性

if(![[NSUserDefaults standardUserDefaults] boolForKey:@"firstStart"]){
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstStart"];
    NSLog(@"第一次启动");
}else{
    NSLog(@"不是第一次启动");
}

+ (NSString *)appVersion
{
    NSString *versionValue = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
    return versionValue;
}

• Info.plis→Bundle version当前版本号
  • [NSBundle mainBundle].infoDictionary
    
• 版本号和沙盒里存储不一致时，新版本
  • 把软件卸载
  • 修改plist版本号
    
    
    

---

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreenmainScreen] bounds]];
    
    // 取出沙盒中上一次使用软件的版本号
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSString *lastVersion = [defaults stringForKey:@"lastVersion"];
    
    // 获得当前软件的版本号
    NSString *currentVersion = [NSBundle mainBundle].infoDictionary[@"CFBundleVersion"];
    
    if ([currentVersion isEqualToString:lastVersion]) {
        // 显示状态栏
        application.statusBarHidden = NO;
        self.window.rootViewController = [[MgTabBarViewController alloc] init];
    } else { // 新版本
        self.window.rootViewController = [[MGNewfeatureViewController alloc] init];
        
        // 存储新版本
        [defaults setObject:currentVersion forKey:@"lastVersion"];
    }
    [self.window makeKeyAndVisible];
    return YES;
}

@interface MGNewfeatureViewController() <UIScrollViewDelegate>
@property (nonatomic, weak) UIPageControl *pageControl;
@end
 
#pragma mark scrollView的控制器
/**
 *  只要UIScrollView滚动了,就自动调用
 */
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    // 1.取出水平方向上滚动的距离
    double offsetX = scrollView.contentOffset.x;
   
    // 2.求出页码
    double pageDouble = offsetX / scrollView.frame.size.width;
    // 谁占主动，就显示谁
    int pageInt = (int)(pageDouble + 0.5);
//    MGLog(@"------%f-----%d", pageDouble, pageInt);
 
    self.pageControl.currentPage = pageInt;
}