iOS scrollView循环自动滚动
额外创建两个imageView
把最后一张图片添加到最前面
把第一张图片添加到最后面
-(void)setData:(FunData *)data
{
_data = data;
NSMutableArray *imageArray = [NSMutableArray array];
[imageArray addObject:[data.imageArray lastObject]];
[imageArray addObjectsFromArray:data.imageArray];
[imageArray addObject:[data.imageArray firstObject]];
float x = 0;
for (NSString *urlString in imageArray)
{
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(x, 0, self.contentView.width, self.contentView.height)];
NSLog(@"%@",urlString);
[imageView sd_setImageWithURL:[NSURL URLWithString:urlString]];
[self.scrollView addSubview:imageView];
x += self.contentView.width;
}
self.pageControl.numberOfPages = data.imageArray.count;
self.pageControl.currentPage = 0;
self.scrollView.delegate = self;
self.scrollView.contentSize = CGSizeMake(x, self.contentView.height);
self.scrollView.contentOffset = CGPointMake(self.contentView.width, 0);
self.scrollView.pagingEnabled = YES;
self.scrollView.showsHorizontalScrollIndicator = NO;
[self startScroll];
}
#pragma mark - 自动滚动
-(void)autoScroll
{
NSInteger currentPage = self.pageControl.currentPage >=self.data.imageArray.count-1? 0:self.pageControl.currentPage+1;
self.pageControl.currentPage = currentPage;
CGFloat pointX = self.scrollView.width * (currentPage + 1);
self.scrollView.contentOffset = CGPointMake(pointX, 0);
}
-(void)startScroll
{
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(autoScroll) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
_timer = timer;
}
-(void)stopScroll
{
[self.timer invalidate];
self.timer = nil;
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
NSInteger page = scrollView.contentOffset.x / scrollView.width - 1;
self.pageControl.currentPage = page;
if (page == self.data.imageArray.count)
{
self.pageControl.currentPage = 0;
[self.scrollView setContentOffset:CGPointMake(self.contentView.width, 0) animated:NO];
}
else if (page == -1)
{
self.pageControl.currentPage = self.data.imageArray.count;
[self.scrollView setContentOffset:CGPointMake(self.contentView.width * self.data.imageArray.count, 0) animated:NO];
}
}
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
[self stopScroll];
}
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
[self startScroll];
}