Question

我想在同一页面中构建两个UICollectionView。两个UICollectionView将根据需要显示不同的数据。我怎么能这样做？

- (void)viewDidLoad
{

    [super viewDidLoad];

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

    for (int i = 0; i < 9; i++) {
        [self.arr addObject:[UIImage imageNamed:@"1.png"]];
    }

    for (int i = 0; i < 9; i++) {
        [self.arr2 addObject:[UIImage imageNamed:@"2.png"]];

    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
    [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];

    self.col = [[UICollectionView alloc] initWithFrame:[[UIScreen mainScreen] bounds] collectionViewLayout:flowLayout];

    [self.col registerClass:[CollectionViewCell class] forCellWithReuseIdentifier:@"MyCollectionCell"];

    [self.col2 registerClass:[CollectionViewCell class] forCellWithReuseIdentifier:@"CollectionCell"];

    UICollectionViewFlowLayout *flowLayout2 = [[UICollectionViewFlowLayout alloc] init];

    [flowLayout2 setScrollDirection:UICollectionViewScrollDirectionVertical];

    self.col2 = [[UICollectionView alloc] initWithFrame:[[UIScreen mainScreen] bounds] collectionViewLayout:flowLayout];

    [self.col2 registerClass:[CollectionViewCell class] forCellWithReuseIdentifier:@"MyCollectionCell"];


    [self.col setDelegate:self];
    [self.scrollView addSubview:self.col];

    [self.col2 setDelegate:self];
    [self.scrollView addSubview:self.col2];

}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    if ([collectionView isEqual:self.col2])
    {
        return self.arr2.count;
    }

    return self.arr.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"MyCollectionCell" forIndexPath:indexPath];
    if (collectionView == self.col2)
    {
        cell.imageView.image = [self.arr2 objectAtIndex:indexPath.row];
    }

    cell.imageView.image = [self.arr objectAtIndex:indexPath.row];

    return cell;
}

Answer 1

您在此处缺少else声明：

CollectionViewCell *cell = [collectionView   dequeueReusableCellWithReuseIdentifier:@"MyCollectionCell" forIndexPath:indexPath];
if (collectionView == self.col2) {
    cell.imageView.image = [self.arr2 objectAtIndex:indexPath.row];
} else {
    cell.imageView.image = [self.arr objectAtIndex:indexPath.row];
}
return cell;

如果这不起作用，您能否更确切地说明您的问题究竟是什么？ UICollectionView之一是否显示或显示错误的数据？

编辑：好的，我看到你错过了其他两件事：

初始化arr2：

self.arr2 = [[NSMutableArray alloc] init];

您为UICollectionView s：

定义了相同的框架

self.col  = [[UICollectionView alloc] initWithFrame:[[UIScreen mainScreen] bounds] collectionViewLayout:flowLayout];
self.col2 = [[UICollectionView alloc] initWithFrame:[[UIScreen mainScreen] bounds] collectionViewLayout:flowLayout];

您需要定义不同的框架，即：

CGRect frame1 = CGRectMake(0,0,240,320);
CGRect frame2 = CGRectMake(0,320,240,320);

self.col  = [[UICollectionView alloc] initWithFrame:frame1 collectionViewLayout:flowLayout];
self.col2 = [[UICollectionView alloc] initWithFrame:frame2 collectionViewLayout:flowLayout];

这只是一个例子，具体取决于您的使用情况。

注意：您应该使用Autolayouts，而不是显式框架。

如何在同一页面上拥有两个集合视图

1 个答案: