cellForItemAtIndexPath,sizeForItemAtIndexPath,insetForSectionAtIndex未被调用iOS

概述我使用collectionView在从Core database获取后显示图像.但是,除了numberOfItemsInSection& numberOfSectionsInCollectionView.代理和数据源设置正确. 单元的标识符是photoCell,类是JLTPhotoCell. - (void)viewDidLoad { [super view 我使用collectionVIEw在从Core database获取后显示图像.但是,除了numberOfItemsInSection& numberOfSectionsInCollectionVIEw.代理和数据源设置正确.

单元的标识符是photoCell,类是JLTPhotoCell.

- (voID)vIEwDIDLoad        {            [super vIEwDIDLoad];            _thumbnails = [[NSArray alloc]init]; // its declared,don't worry about this            _thumbnails = [[LADataModelController getSingleton] getAllSignatures];            UICollectionVIEwFlowLayout *layout = [[UICollectionVIEwFlowLayout alloc] init];            [layout setItemSize:( CGSizeMake(50,50))];            [_collectionVIEw setCollectionVIEwLayout:layout];            self.collectionVIEw.delegate = self;            self.collectionVIEw.dataSource = self;            [_collectionVIEw registerClass:[JLTPhotoCell class] forCellWithReuseIDentifIEr:@"photoCell"];            [self.vIEw addSubvIEw:self.collectionVIEw];            self.collectionVIEw.allowsSelection = true;    }- (NSInteger)collectionVIEw:(UICollectionVIEw *)vIEw numberOfItemsInSection:(NSInteger)section{    NSLog(@"count %i",_thumbnails.count);    return _thumbnails.count;}- (NSInteger)numberOfSectionsInCollectionVIEw: (UICollectionVIEw *)collectionVIEw{    return 1;}- (UICollectionVIEwCell *)collectionVIEw:(UICollectionVIEw *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath{    if (_thumbnails.count > 0)    {        JLTPhotoCell *cell = [cv dequeueReusableCellWithReuseIDentifIEr:@"photoCell" forIndexPath:indexPath];        NSData *thumbnailData = ((LASignature*)[_thumbnails objectAtIndex:indexPath.row]).signatureImage;        UIImage* thumbnailImage = [UIImage imageWithData:thumbnailData];        [cell setthumbnail:thumbnailImage];        NSLog(@"image:%@",thumbnailImage);        if (!_buttonSelect.hIDden)        {            [cell performSelected:FALSE];        }        return cell;    }    return nil;}#pragma mark UICollectionVIEwDelegate Methods-(voID) collectionVIEw:(UICollectionVIEw *)collectionVIEw dIDSelectItemAtIndexPath:(NSIndexPath *)indexPath{    _lastSelectedSign = [_thumbnails objectAtIndex:indexPath.row];    if (!self.buttonSelect.hIDden)    {        JLTPhotoCell *cell = (JLTPhotoCell *)[_collectionVIEw cellForItemAtIndexPath:indexPath];        cell.selected = FALSE;    }    else    {        [_selectedImages addobject:[_thumbnails objectAtIndex:indexPath.row]];        JLTPhotoCell *cell = (JLTPhotoCell *)[_collectionVIEw cellForItemAtIndexPath:indexPath];        [cell performSelected:TRUE];      //  _buttonDelete.enabled = _selectedImages.count > 0;    }}-(voID) collectionVIEw:(UICollectionVIEw *)collectionVIEw dIDdeselectItemAtIndexPath:(NSIndexPath *)indexPath{    [_selectedImages removeObject:[_thumbnails objectAtIndex:indexPath.row]];    JLTPhotoCell *cell = (JLTPhotoCell *)[_collectionVIEw cellForItemAtIndexPath:indexPath];    [cell performSelected:FALSE];    _buttonDelete.enabled = _selectedImages.count > 0;}#pragma mark - UICollectionVIEwDelegateFlowLayout-(CGSize) collectionVIEw:(UICollectionVIEw *)collectionVIEw layout:(UICollectionVIEwLayout *)collectionVIEwLayout sizeforItemAtIndexPath:(NSIndexPath *)indexPath{   return  CGSizeMake(50,50) ;}-(UIEdgeInsets) collectionVIEw:(UICollectionVIEw *)collectionVIEw layout:(UICollectionVIEwFlowLayout *)collectionVIEwLayout insetForSectionAtIndex:(NSInteger)section{    collectionVIEwLayout.minimumInteritemSpacing=1;    collectionVIEwLayout.minimumlinespacing =2;    return UIEdgeInsetsMake(1,1,1);}jltPhotoCell Class-(voID) setthumbnail:(UIImage *) thumbnail{    [self setthumbnail:thumbnail anDWithSize:(CGSizeMake(50,50))];}-(voID) setthumbnail:(UIImage *) thumbnail anDWithSize:(CGSize) size{    UIImageVIEw *thumbImageVIEw = [[UIImageVIEw alloc] initWithImage:thumbnail];    thumbImageVIEw.frame = CGRectMake(0,size.wIDth,size.height);    thumbImageVIEw.userInteractionEnabled = YES;    [self.contentVIEw addSubvIEw:thumbImageVIEw];}-(voID) performSelected:(bool)selected{    if (selected)    {        UIImageVIEw *deleteImageVIEw = [[UIImageVIEw alloc] initWithImage:[UIImage imagenamed:@"delete"]];        deleteImageVIEw.frame = CGRectMake(self.contentVIEw.frame.size.wIDth - 35,3,32,32);        deleteImageVIEw.tag = 123;        [self.contentVIEw addSubvIEw:deleteImageVIEw];    }    else    {        UIVIEw *v = [self.contentVIEw vIEwWithTag:123];        v.hIDden = YES;        [self.contentVIEw bringSubvIEwToFront:v];        [v removeFromSupervIEw];    }}

任何建议将不胜感激.谢谢.

解决方法 作为@highlycaffeinated我遇到了这个问题.但是调用invalIDateLayout对我来说不起作用.

但是,在数据源工作之后分配代理.

我变了：

self.collectionVIEw.delegate = self;self.collectionVIEw.dataSource = self;

有：

self.collectionVIEw.dataSource = self;self.collectionVIEw.delegate = self;

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