i want to custom tabbars and want to circulate slide,default tab bar only have 5 items show at the same time,it not meet me,i have 11 items,so i want to make 3 tabbars ,every have 5 items,for example A(0-4)-->B(5-9)-->C(10)-->A-->B-->C-->A. at print i only finish A(0-4)-->B(5-9)-->C(10),how to make them circulate? my code : .h file

 #import <UIKit/UIKit.h>

 @protocol InfiniTabBarDelegate;

 @interface InfiniTabBar : UIScrollView <UIScrollViewDelegate, UITabBarDelegate> {
 __weak id <InfiniTabBarDelegate> infiniTabBarDelegate;
NSMutableArray *tabBars;
UITabBar *aTabBar;
UITabBar *bTabBar;
  }

 @property (nonatomic, weak) id infiniTabBarDelegate;
 @property (strong,nonatomic) NSMutableArray *tabBars;
 @property (strong,nonatomic) UITabBar *aTabBar;
 @property (strong,nonatomic) UITabBar *bTabBar;

 - (id)initWithItems:(NSArray *)items;
 - (void)setBounces:(BOOL)bounces;
 // Don't set more items than initially
 - (void)setItems:(NSArray *)items animated:(BOOL)animated;
 - (int)currentTabBarTag;
 - (int)selectedItemTag;
  - (BOOL)scrollToTabBarWithTag:(int)tag animated:(BOOL)animated;
  - (BOOL)selectItemWithTag:(int)tag;

  @end

  @protocol InfiniTabBarDelegate <NSObject>
   - (void)infiniTabBar:(InfiniTabBar *)tabBar didScrollToTabBarWithTag:(int)tag;
   - (void)infiniTabBar:(InfiniTabBar *)tabBar didSelectItemWithTag:(int)tag;
   @end

.m file

@implementation InfiniTabBar

 @synthesize infiniTabBarDelegate;
 @synthesize tabBars;
 @synthesize aTabBar;
 @synthesize bTabBar;

 - (id)initWithItems:(NSArray *)items {
self = [super initWithFrame:CGRectMake(0.0, 411.0, 320.0, 49.0)];
// TODO:
//self = [super initWithFrame:CGRectMake(self.superview.frame.origin.x + self.superview.frame.size.width - 320.0, self.superview.frame.origin.y + self.superview.frame.size.height - 49.0, 320.0, 49.0)];
// Doesn't work. self is nil at this point.




if (self) {
    self.pagingEnabled = YES;
    self.delegate = self;

    self.tabBars = [[NSMutableArray alloc] init];

    float x = 0.0;

    for (double d = 0; d < ceil(items.count / 5.0); d ++) {
        UITabBar *tabBar = [[UITabBar alloc] initWithFrame:CGRectMake(x, 0.0, 320.0, 49.0)];
        tabBar.delegate = self;

        int len = 0;

        for (int i = d * 5; i < d * 5 + 5; i ++)
            if (i < items.count)
                len ++;

        tabBar.items = [items objectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(d * 5, len)]];
    //  NSLog(@"####%@",NSMakeRange(d * 5, len));


        [self.tabBars addObject:tabBar];
        [self addSubview:tabBar];


        x += 320.0;
    }

    self.contentSize = CGSizeMake(x, 49.0);
}

   return self;
  }

 - (void)setBounces:(BOOL)bounces {
if (bounces) {
    int count = self.tabBars.count;

    if (count > 0) {
        if (self.aTabBar == nil)
            self.aTabBar = [[UITabBar alloc] initWithFrame:CGRectMake(-320.0, 0.0, 320.0, 49.0)];

        [self addSubview:self.aTabBar];

        if (self.bTabBar == nil)
            self.bTabBar = [[UITabBar alloc] initWithFrame:CGRectMake(count * 320.0, 0.0, 320.0, 49.0)];

        [self addSubview:self.bTabBar];
    }
} else {
    [self.aTabBar removeFromSuperview];
    [self.bTabBar removeFromSuperview];
}

[super setBounces:bounces];

  }

  - (void)setItems:(NSArray *)items animated:(BOOL)animated {
for (UITabBar *tabBar in self.tabBars) {
    int len = 0;

    for (int i = [self.tabBars indexOfObject:tabBar] * 5; i < [self.tabBars indexOfObject:tabBar] * 5 + 5; i ++)
        if (i < items.count)
            len ++;

    [tabBar setItems:[items objectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange([self.tabBars indexOfObject:tabBar] * 5, len)]] animated:animated];

}

self.contentSize = CGSizeMake(ceil(items.count / 5.0) * 320.0, 49.0);
}

 - (int)currentTabBarTag {
return self.contentOffset.x / 320.0;
}

 - (int)selectedItemTag {
for (UITabBar *tabBar in self.tabBars)
    if (tabBar.selectedItem != nil)
        return tabBar.selectedItem.tag;

// No item selected
return 0;
  }

   - (BOOL)scrollToTabBarWithTag:(int)tag animated:(BOOL)animated {
for (UITabBar *tabBar in self.tabBars)
    if ([self.tabBars indexOfObject:tabBar] == tag) {
        UITabBar *tabBar = [self.tabBars objectAtIndex:tag];

        [self scrollRectToVisible:tabBar.frame animated:animated];

        if (animated == NO)
            [self scrollViewDidEndDecelerating:self];

        return YES;
    }

return NO;
 }

  - (BOOL)selectItemWithTag:(int)tag {
  for (UITabBar *tabBar in self.tabBars)
    for (UITabBarItem *item in tabBar.items)
        if (item.tag == tag) {
            tabBar.selectedItem = item;

            [self tabBar:tabBar didSelectItem:item];

            return YES;
        }

return NO;
  }

   - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
[infiniTabBarDelegate infiniTabBar:self  didScrollToTabBarWithTag:scrollView.contentOffset.x / 320.0];
    }

   - (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
[self scrollViewDidEndDecelerating:scrollView];
   }

   - (void)tabBar:(UITabBar *)cTabBar didSelectItem:(UITabBarItem *)item {
// Act like a single tab bar
for (UITabBar *tabBar in self.tabBars)
    if (tabBar != cTabBar)
        tabBar.selectedItem = nil;

[infiniTabBarDelegate infiniTabBar:self didSelectItemWithTag:item.tag];
  }


@end