HomePageViewController

– (void)createScrollView
{

_imageArray = @[@"img_head1",@"img_head2",@"img_head3"];_circulationView  = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 130)];_circulationView.frame = [ToolViewAndData MyAutoLayout:_circulationView];_circulationView.delegate = self;_circulationView.showsHorizontalScrollIndicator = NO;[self.view addSubview:_circulationView];CGFloat imageW = _circulationView.frame.size.width;CGFloat imageH = _circulationView.frame.size.height;_circulationView.contentSize = CGSizeMake(imageW *_imageArray.count, 0);for (int i =0; i<_imageArray.count; i++) {    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(i *imageW, 0, imageW, imageH)];    imageView.image = [UIImage imageNamed:_imageArray[i]];    [_circulationView addSubview:imageView];}_circulationView.pagingEnabled = YES;_pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(120, 100, 80, 30)];_pageControl.frame = [ToolViewAndData MyAutoLayout:_pageControl];_pageControl.currentPage = 0;_pageControl.numberOfPages = _imageArray.count;[self.view addSubview:_pageControl];[_pageControl addTarget:self action:@selector(changePageClick:) forControlEvents:UIControlEventValueChanged];[self addTimer];

}

pragma mark ——-点击pagecontroll

–(void)changePageClick:(UIPageControl *)sender
{
int page = (int)_pageControl.currentPage;

CGFloat x = page * _circulationView.frame.size.width;_circulationView.contentOffset = CGPointMake(x, 0);

}

pragma mark —– ScrollView滚动的时候调用

– (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat scrollViewW = scrollView.frame.size.width;
CGFloat x = scrollView.contentOffset.x;
int page = (x +scrollViewW/2) / scrollViewW;
_pageControl.currentPage = page;
}

pragma mark —— 开始拖拽的时候调用

–(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
[self removeTimer];
}

pragma mark ——- 关闭定时器

– (void)removeTimer
{
[_timer invalidate];
}
–(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
[self addTimer];
}

pragma mark —-开启定时器

– (void)addTimer
{
_timer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(nextImage) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop]addTimer:_timer forMode:NSRunLoopCommonModes];
}

pragma mark —— 定时器滚动图片

–(void)nextImage
{
int page = (int)_pageControl.currentPage;
if (page == _imageArray.count -1) {
page = 0;
}
else
{
page ++;
}

CGFloat x = page * _circulationView.frame.size.width;_circulationView.contentOffset = CGPointMake(x, 0);

}