iOS开发中实现新闻图片的无限循环展示的方法

复制代码
@implementation YYViewController

 

#pragma mark-懒加载
//-(NSArray *)news
//{
//    if (_news==nil) {
//        _news=[YYnews objectArrayWithFilename:@"newses.plist"];
//    }
//    return _news;
//}
-(NSMutableArray *)news
{
    if (_news==nil) {
        _news=[NSMutableArray array];
        for (int i=0; i<200; i++) {
            NSArray *array=[YYnews objectArrayWithFilename:@"newses.plist"];
            [_news addObjectsFromArray:array];
        }
    }
    return _news;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    //注册cell
//    [self.collectinView registerClass:[YYimageCell class] forCellWithReuseIdentifier:YYCell];
    [self.collectinView registerNib:[UINib nibWithNibName:@"YYcell" bundle:nil] forCellWithReuseIdentifier:YYIDCell];
    
    //默认处于第0组的第500个模型的左边
    [self.collectinView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:500 inSection:0] atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];
    
}

#pragma mark- UICollectionViewDataSource
//一共多少组，默认为1组
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return self.news.count;
}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    YYcell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:YYIDCell forIndexPath:indexPath];
    cell.news=self.news[indexPath.item];
    NSLog(@"%p,%d",cell,indexPath.item);
    return cell;
}

#pragma mark-UICollectionViewDelegate
@end