UICollectionView 接收到具有不存在索引路径的单元格的布局属性 [英] UICollectionView recieved layout attributes for a cell with an index path that does not exist

问题描述

我使用 UICollection 视图在网格布局中显示项目.

I have used UICollection view to show items in grid layout.

对于数据源，我使用 5*5 维数组.

For data source I have use 5*5 dimensional array.

我还为 section 中的 numberOfItems 返回 5，为 numberOfSections 返回 5.

And also I am returning 5 for numberOfItems in section and 5 for numberOfSections.

然后我的应用程序也因以下错误而崩溃:

Then also my app is getting crashed with following error:

'UICollectionView 收到一个单元格的布局属性，其索引路径不存在:{length = 2, path = 0 - 5}'

'UICollectionView recieved layout attributes for a cell with an index path that does not exist: {length = 2, path = 0 - 5}'

//////===viewcontroller.m==///////
- (void)viewDidLoad {
    self.theData = @[@[@"1",@"2",@"3",@"4",@"5"], @[@"6",@"7",@"8",@"9",@"10"],@[@"11",@"12",@"13",@"14",@"15"],@[@"16",@"17",@"18",@"19",@"20"],@[@"21",@"22",@"23",@"24",@"25"]];
    MultpleLineLayout *layout = [[MultpleLineLayout alloc] init];
    self.collectionView.collectionViewLayout = layout;
    self.collectionView.showsHorizontalScrollIndicator = NO;
    self.collectionView.showsVerticalScrollIndicator = NO;
    layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
    self.view.backgroundColor = [UIColor blackColor];
    [self.collectionView registerClass:[DataCell class] forCellWithReuseIdentifier:@"DataCell"];
    [self.collectionView reloadData];
}


- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section
{
    return 5;

}

- (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView {
    return 5;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView  cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    DataCell *cell = [collectionView  dequeueReusableCellWithReuseIdentifier:@"DataCell" forIndexPath:indexPath];
    cell.label.text = self.theData[indexPath.section ][indexPath.row];
    return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
   // UICollectionViewCell *item = [collectionView cellForItemAtIndexPath:indexPath];
    NSLog(@"%@",indexPath);

}
///////////////////////

谁能解决这个问题?提前致谢.

Can anyone solve this problem? Thanks in advance.

推荐答案

MultipleLineLayout 最初是为无限滚动而编写的，所以该实现存在问题供您使用.它应该是这样的，

The MultipleLineLayout was originally written for infinite scrolling, so there was a problem with that implementation for your use. It should look like this,

-(NSArray*)layoutAttributesForElementsInRect:(CGRect)rect {

    NSMutableArray* attributes = [NSMutableArray array];
    for(NSInteger i=0 ; i < self.collectionView.numberOfSections; i++) {
        for (NSInteger j=0 ; j < [self.collectionView numberOfItemsInSection:i]; j++) {
            NSIndexPath* indexPath = [NSIndexPath indexPathForItem:j inSection:i];
            [attributes addObject:[self layoutAttributesForItemAtIndexPath:indexPath]];
        }
    }
    return attributes;
}

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