iphone - Collection View 中的单元格不可见

Question

这是 Collection View 的代码:

- (void)viewDidLoad
{
    [super viewDidLoad];
    ...
    [_teamsCollection registerClass:[MWTeamCollectionCell class] forCellWithReuseIdentifier:@"Cell"];

}
#pragma mark data source and delegate methods of collection view
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return 1;
}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return 10;
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *CellIdentifier = @"Cell";
    MWTeamCollectionCell *cell = [_teamsCollection dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
    if (cell == nil) {
        cell = (MWTeamCollectionCell*)[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }
    cell.teamName.text = @"team name";
    return cell;
}

当我调试 return cell; 行时，我得到了正确的日志，但我没有看到单元格。

(gdb) po cell
<MWTeamCollectionCell: 0x72aff80; baseClass = UICollectionViewCell; frame = (0 0; 50 50); layer = <CALayer: 0x72b0090>>
(gdb) po cell
<MWTeamCollectionCell: 0x72b08e0; baseClass = UICollectionViewCell; frame = (67.5 0; 50 50); layer = <CALayer: 0x72b0970>>
(gdb) po cell
<MWTeamCollectionCell: 0x8aad380; baseClass = UICollectionViewCell; frame = (135 0; 50 50); layer = <CALayer: 0x8a72d20>>

Answer 1

不需要像 UITabeView 这样注册类，试试这个:

[yourCollection registerClass:[MWTeamCollectionCell class] forCellWithReuseIdentifier:@"CellName"];

然后

- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    MWTeamCollectionCell *cell = [yourCollection dequeueReusableCellWithReuseIdentifier:@"CellName" forIndexPath:indexPath];
    //Setting some thing here

    return cell;

}

够了，记住 MWTeamCollectionCell:UICollectionViewCell 并在 MWTeamCollectionCell.m 中的 (id)init 中自定义(初始化你的 teamName 标签)

UICollectionView 只能在 iOS6 上使用，如果你尝试 iOS5，没有任何显示