UICollectionView不滚动(UICollectionView does not scro

我有一个UICollectionView设置与UICollectionViewDataSource目前提供6个项目。这些都是少于需要填补屏幕。问题是，我的集合视图仅当有足够的项目填满屏幕（10，20测试）滚动。当显示较少的项目它甚至不会做这种反弹的动画我试图得到的，它只是固定。

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateCollectionViewData) name:UIDocumentStateChangedNotification object:nil];

    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc]init];
    flowLayout.itemSize = CGSizeMake(160, 100);
    flowLayout.minimumInteritemSpacing = 0;
    flowLayout.minimumLineSpacing = 0;

    self.collectionView = [[UICollectionView alloc]initWithFrame:self.view.bounds collectionViewLayout:flowLayout];
    [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"];
    self.collectionView.delegate = self;
    self.collectionView.dataSource = self;
    self.collectionView.bounces = YES;
    [self.view addSubview:self.collectionView];
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return [self.collectionViewData count];
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
     UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];

    Expense *expense = [self.collectionViewData objectAtIndex:indexPath.row];

    UILabel *label = [[UILabel alloc]initWithFrame:cell.bounds];
    label.text = expense.value;
    label.backgroundColor = [UIColor clearColor];
    label.font = [UIFont fontWithName:@"Miso-Bold" size:30];
    label.textAlignment = NSTextAlignmentCenter;
    [cell addSubview:label];

    cell.backgroundColor = [UIColor colorWithRed:1 - (indexPath.row / 30.0f) green:0 blue:1 alpha:1];

    return cell;
}

谢谢你的帮助！

Answer 1:

bounces ，尽管它的名字，是不是要设置合适的物业。您还需要设置alwaysBounceVertical和/或alwaysBounceHorizontal 。从文档：