은 UICollectionView 헤더

Question

가 여기에 관련 코드의 작업을 가져올 수 없습니다 :

컨트롤러 : 여기

- (instancetype)init { 
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init]; 

    layout.itemSize = CGSizeMake(106.0, 106.0); 
    layout.minimumInteritemSpacing = 1.0; 
    layout.minimumLineSpacing = 1.0; 
    layout.headerReferenceSize = CGSizeMake(320.0, 44.0); 

    return (self = [super initWithCollectionViewLayout:layout]); 
} 

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    // some setup 

    self.collectionView.delegate = self; 
    self.collectionView.dataSource = self; 

    [self.collectionView registerClass:[ITPhotosHeaderView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"header"]; 

} 

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath { 
    UICollectionReusableView *reusableView; 

    if (kind == UICollectionElementKindSectionHeader) { 
     ITPhotosHeaderView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader 
                  withReuseIdentifier:@"header" forIndexPath:indexPath]; 
     headerView = [[ITPhotosHeaderView alloc] initWithFrame:CGRectMake(0, 0, 320.0, 44.0)]; 
     reusableView = headerView; 
    } 

    return reusableView; 
} 

입니다 오류가 나는 얻을 :

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'the view returned from -collectionView:viewForSupplementaryElementOfKind:atIndexPath (UICollectionElementKindSectionHeader,<NSIndexPath: 0xc000000000000016> {length = 2, path = 0 - 0}) was not retrieved by calling -dequeueReusableSupplementaryViewOfKind:withReuseIdentifier:forIndexPath: or is nil (<ITPhotosHeaderView: 0x1781b9de0; baseClass = UICollectionReusableView; frame = (0 0; 320 44); layer = <CALayer: 0x17802f980>>) 

내가 디버깅하고 반환되지 않았 음을 확인했다 무. 따라서 registerClass 부분이 올바르게 작동하지 않는 것 같습니다. 나는 어떤 의견을 주셔서 감사하겠습니다. 감사.

Answer 1

한 가지 확실한 문제는 여기에 있습니다 :

ITPhotosHeaderView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader 
                 withReuseIdentifier:@"header" forIndexPath:indexPath]; 
    headerView = [[ITPhotosHeaderView alloc] initWithFrame:CGRectMake(0, 0, 320.0, 44.0)]; 

그 코드가 무의미하다. 첫 번째 줄에서는 머리글 뷰를 dequeue합니다. 두 번째 줄에서는 방금 축출 한 헤더보기를 버리고 완전히 새로운 헤더보기를 만들려고합니다.