ios中滚动页面

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        int width=frame.size.width;
        int height=frame.size.height;
        scrollview=[[UIScrollView alloc] initWithFrame:CGRectMake(, , width, height)];
        [self addSubview:scrollview];
        for (int i=; i<; i++) {
            UIImageView *imageview=[[UIImageView alloc] initWithFrame:CGRectMake(i*width, , width, height)];
            imageview.image=[UIImage imageNamed:[NSString stringWithFormat:@"image%zi@2x.jpg",(i+)]];
            [scrollview addSubview:imageview];
        }
        scrollview.contentSize=CGSizeMake(*width, height);
        scrollview.pagingEnabled=YES;
        scrollview.showsVerticalScrollIndicator=NO;
        scrollview.showsHorizontalScrollIndicator=NO;
        scrollview.delegate=self;
        scrollview.bounces=NO;

        pagecontroller=[[UIPageControl alloc] initWithFrame:CGRectMake((width-)*0.5f, height--, , )];
        [self addSubview:pagecontroller];

        pagecontroller.currentPage=;
        pagecontroller.numberOfPages=;
        currentPage=;

       self.timer=[NSTimer scheduledTimerWithTimeInterval: target:self
                                                 selector:@selector(timer:) userInfo:nil repeats:YES];
        [self.timer fire];

    }
    return self;
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    CGFloat width=self.bounds.size.width;
    CGPoint point=scrollview.contentOffset;
    CGFloat offenx=point.x;
    pagecontroller.currentPage=offenx/width;
}

-(void)timer:(NSTimer *)time{
    if (currentPage>) {
        currentPage=;
    }
    CGFloat width=self.bounds.size.width;
    [UIView beginAnimations:nil context:nil];
    scrollview.contentOffset=CGPointMake(currentPage*width, );
    pagecontroller.currentPage=currentPage;
    [UIView commitAnimations];
    currentPage++;
}