//本地緩存的版本號 第一次啟動的時候本地是沒有緩存版本號的。
NSString *versionCache = [[NSUserDefaults standardUserDefaults] objectForKey:@"VersionCache"];
//當前應用版本號
NSString *version = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
//如果本地緩存的版本號和當前應用版本號不一樣，則是第一次啟動（更新版本也算第一次啟動）
if (version == nil || ![versionCache isEqualToString:version])
{

    MSUTabbarController *tab = [[MSUTabbarController alloc] init];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:tab];
    nav.navigationBar.hidden = YES;
    self.window.rootViewController = nav;
    
    _scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
    _scrollView.backgroundColor = [UIColor orangeColor];
    _scrollView.pagingEnabled = YES;
    _scrollView.delegate = self;
    _scrollView.showsVerticalScrollIndicator = NO;
    _scrollView.contentSize = CGSizeMake(WIDTH * 3, HEIGHT);
    [self.window addSubview:_scrollView];
    [self.window bringSubviewToFront:_scrollView];
    //啟動頁的滑動頁面
    NSArray *picArray = [[NSArray alloc] initWithObjects:@"yindaoye1", @"yindaoye2",@"yindaoye3",nil];
    
    
    for (int i = 0; i < picArray.count; i++) {
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(WIDTH * i, 0, WIDTH, HEIGHT)];
        imageView.image = [MSUPathTools showImageWithContentOfFileByName:[picArray objectAtIndex:i]];
        [_scrollView addSubview:imageView];
    }


    //設置上下面這句話，將當前版本緩存到本地，下次對比一樣，就不走啟動視屏了。
    //也可以將這句話放在MSUMovieController.m的進入應用方法enterMainAction里面
    //為了讓每次都可以看到啟動視屏，這句話先注釋掉

// [[NSUserDefaults standardUserDefaults] setObject:version forKey:@"VersionCache"];
// [[NSUserDefaults standardUserDefaults] synchronize];

}else{
    //不是首次啟動
    [self createRootWithDictionary:launchOptions application:(UIApplication *)application];
}

pragma mark - 隱藏引導頁

• (void)hideGuidView{
  [UIView animateWithDuration:0.5 animations:^{
  _scrollView.alpha = 0;
  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
  [_scrollView removeFromSuperview];

    });
  

  }];
  }

pragma mark - scrollView Delegate

• (void)scrollViewWillBeginDragging:(UIScrollView )scrollView{
  int cuttentIndex = (int)(scrollView.contentOffset.x + kScreen_width0.5)/kScreen_width;
  BOOL isScrollOut = YES;
  if (cuttentIndex == 2) {
  if ([self isScrolltoLeft:scrollView]) {
  if (!isScrollOut) {
  return;
  }
  [self hideGuidView];
  }
  }
  }

pragma mark - 判斷滾動方向

• (BOOL )isScrolltoLeft:(UIScrollView *)scrollView{
  //返回YES為向左滑動，NO為右滾動
  if ([scrollView.panGestureRecognizer translationInView:scrollView.superview].x < 0) {
  NSLog(@"%f",[scrollView.panGestureRecognizer translationInView:scrollView.superview].x);
  return YES;
  }else{
  return NO;
  }
  }