Question

我正在尝试将静态数据添加到UiCollectionViewController中。问题是程序启动后它给了我未捕获的异常错误日志：

2014-03-27 19:13:35.519 Rss[5435:a0b] viewDidLoad
2014-03-27 19:13:35.521 Rss[5435:a0b] numberofsectionsInCOllectionView
2014-03-27 19:13:35.521 Rss[5435:a0b] numberOfItemInSection
2014-03-27 19:13:35.523 Rss[5435:a0b] *** Assertion failure in -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:], /SourceCache/UIKit_Sim/UIKit-2903.23/UICollectionView.m:1365
2014-03-27 19:13:35.530 Rss[5435:a0b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'the collection view's data source did not return a valid cell from -collectionView:cellForItemAtIndexPath: for index path <NSIndexPath: 0xa02eae0> {length = 2, path = 0 - 0}'

这是我的CollectionView服装类：

#import "RootViewController.h"

#define kCustomRowCount     7


@interface RootViewController ()
@property (nonatomic, strong) NSMutableDictionary *imageDownloadsInProgress;
@end


@implementation RootViewController{
    NSMutableArray *array;
}

#pragma mark 

// -------------------------------------------------------------------------------
//  viewDidLoad
// -------------------------------------------------------------------------------
- (void)viewDidLoad
{
 NSLog(@"viewDidLoad");
    [super viewDidLoad];
    array = [[NSMutableArray alloc] init];
    [array addObject:@"User1"];
    [array addObject:@"User2"];
    [array addObject:@"User3"];
    [array addObject:@"User4"];
    [array addObject:@"User5"];
    [array addObject:@"User6"];
    [array addObject:@"User7"];
    [array addObject:@"User8"];


}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    NSArray *allDownloads = [self.imageDownloadsInProgress allValues];
    [allDownloads makeObjectsPerformSelector:@selector(cancelDownload)];

    [self.imageDownloadsInProgress removeAllObjects];
}


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

-(NSInteger) numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
     NSLog(@"numberofsectionsInCOllectionView");
    return 1;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    NSLog(@"numberOfItemInSection");
    return [array count];
}


}
- (UICollectionViewCell *)collectionview:(UICollectionView *)collectionview cellForItemAtIndexPath:(NSIndexPath *)indexPath 
{
    NSLog(@"cellForItemAtIndexPath");


        UICollectionViewCell *cell = [collectionview dequeueReusableCellWithReuseIdentifier:@"CELL"
                                                                                forIndexPath:indexPath ];
    UILabel *label = (UILabel *)[cell viewWithTag:100];
    label.text = [array objectAtIndex:indexPath.row];
        return cell;
}

@end

我用Google搜索了错误，但此行没有出现任何内容：“数据源未返回有效单元格”。我通过拖动它们将故事板中的数据源和委托设置为类。

CollectionView数据源上的NSInternalInconsistencyException

0 个答案: