icarousel implementation file

gistfile1.m

- (void)configureContainers
{
    _containerRect = CGRectMake(0.0f, 0.0f, CGRectGetWidth(self.view.bounds), self.tabBarHeight);
    
    // Tabbar container view
    _tabButtonsContainerView = [[UIView alloc] initWithFrame:_containerRect];
    _tabButtonsContainerView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
    _tabButtonsContainerView.backgroundColor = [UIColor colorWithWhite:1.0f alpha:0.8f];
    [self.view addSubview:_tabButtonsContainerView];
    
    // Adding carousel manually
    _headerCarousel = [[iCarousel alloc] initWithFrame:_containerRect];
    _headerCarousel.type = iCarouselTypeLinear;
    _headerCarousel.scrollSpeed = 0.1f;
    _headerCarousel.decelerationRate = 0.5f;
    _headerCarousel.centerItemWhenSelected = YES;
    _headerCarousel.stopAtItemBoundary = YES;
    _headerCarousel.delegate = self;
    _headerCarousel.dataSource = self;
    _headerCarousel.currentItemIndex = CURRENT_SELECTED_CATEGORY;   // setting current index for header carousel view
    [_tabButtonsContainerView addSubview:_headerCarousel];
    
    // Right indicator
    _rightIndicator = [UIButton buttonWithType:UIButtonTypeCustom];
    _rightIndicator.frame = CGRectMake(CGRectGetMaxX(_tabButtonsContainerView.frame) - 60.0f, 0.0f, 60.0f, 30.0f);
    _rightIndicator.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"segmented_right_arrow"]];
    [_rightIndicator addTarget:self action:@selector(goSegmentedForward:) forControlEvents:UIControlEventTouchUpInside];
    [_tabButtonsContainerView addSubview:_rightIndicator];
    
    // Left indicator
    _leftIndicator = [UIButton buttonWithType:UIButtonTypeCustom];
    _leftIndicator.frame = CGRectMake(0.0f, 0.0f, 60.0f, 30.0f);
    _leftIndicator.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"segmented_left_arrow"]];
    [_leftIndicator addTarget:self action:@selector(goSegmentedBackward:) forControlEvents:UIControlEventTouchUpInside];
    [_tabButtonsContainerView addSubview:_leftIndicator];
    
    /**
     The content fills the whole screen so the buttons can be animated in and out.
     Scrollviews set as the content view should use contentInset property to avoid being overlapped by the buttons.
     */
    _containerRect.origin.y = self.tabBarHeight / 2;
    _containerRect.size.height = self.view.bounds.size.height;
    _contentContainerView = [[UIView alloc] initWithFrame:_containerRect];
    _contentContainerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    _contentContainerView.backgroundColor = [UIColor clearColor];
    
    // Main content carousel
    _contentCarousel = [[iCarousel alloc] initWithFrame:_containerRect];
    _contentCarousel.delegate = self;
    _contentCarousel.dataSource = self;
    _contentCarousel.currentItemIndex = CURRENT_SELECTED_CATEGORY;
    _headerCarousel.scrollSpeed = 0.5f;
    _headerCarousel.decelerationRate = 1.0;
    _headerCarousel.scrollToItemBoundary = YES;
    _headerCarousel.centerItemWhenSelected = YES;
    _headerCarousel.scrollEnabled = YES;
    _headerCarousel.type = iCarouselTypeLinear;

    [self.view addSubview:_contentContainerView];
    [_contentContainerView addSubview:_contentCarousel];
    
    [self.view bringSubviewToFront:_tabButtonsContainerView];
}


- (NSInteger)numberOfItemsInCarousel:(iCarousel *)carousel {
    return _categories.count;
}


- (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSInteger)index reusingView:(UIView *)view {
    
    if(carousel == self.contentCarousel) {
        self.contentVC = [[ContentVC alloc] init]; // this is basically view controller
        [self addChildViewController:self.contentVC];
        [self.contentVC didMoveToParentViewController:self];
        return self.contentVC.collectionView;
    }
    
    if(carousel == self.headerCarousel) {

        view = [TRUSegmentViewGenerator segmentedViewWithTitle:_categories[index] withParentView:self.tabButtonsContainerView]; // tabButtonsContainerView is a holder view.
        return view;
    }
    
    return view;
    
}

- (CGFloat)carousel:(iCarousel *)carousel valueForOption:(iCarouselOption)option withDefault:(CGFloat)value {

    if(carousel == self.headerCarousel) {
        switch (option) {
            case iCarouselOptionWrap    : return YES;
            case iCarouselOptionSpacing : return value * 1.05f;
            default: break;
        }
    }
    else if(carousel == self.contentCarousel) {
        switch (option) {
            case iCarouselOptionWrap: return YES;
            case iCarouselOptionSpacing: return value * 1.0f;
            default: break;
        }
    }
    
    return value;
}