iOS:Storyboard CollectionView未被触发

Question

我在导航控制器中嵌入了一个UICollectionView控制器.collectionView列出项目,每个单元格应该转到ProjectDetail屏幕.

我根本无法触发segue.如果我只是在导航栏上放下一个按钮并将一个segue连接到细节,它就可以工作.但是从我的CollectionView单元格触发却没有.

这是故事板的样子:http://cl.ly/RfcM 我有一个从CollectionViewCell连接到ProjectDetailViewController的segue

这是我的ProjectDetailViewController中的相关代码:

@interface ProjectCollectionViewController () {
    NSArray *feedPhotos;
    Projects *projects;
}

@end

@implementation ProjectCollectionViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.collectionView registerClass:[FeedViewCell class] forCellWithReuseIdentifier:@"cell"];
    [self loadData];

}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"selected %d", indexPath.row);
    Project *project = [projects getProject:indexPath.row];
    NSLog(@"project = %@", project);
}

- (void)loadData {

    [self.projectLoader loadFeed:self.username
                       onSuccess:^(Projects *loadedProjects) {
                           NSLog(@"view did load on success :  projects %@", loadedProjects);
                           projects = loadedProjects;

                           [self.collectionView reloadData];
                       }
                       onFailure:^(NSError *error) {
                           [self handleConnectionError:error];
                       }];
}


- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
   return projects.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *identifier = @"cell";
    FeedViewCell *cell = (FeedViewCell *) [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
    cell.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:1.0 alpha:1.0];
    UIImageView *cellImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    Project *project = [projects getProject:indexPath.row];
    NSString *imageUrl = [project coverPhotoUrl:200 forHeight:200];
    NSLog(@"imageurl =>%@", imageUrl);
    if (imageUrl) {
        [cellImageView setImageWithURL:[NSURL URLWithString:imageUrl]];
    }
    [cell addSubview:cellImageView];
    cell.imageView = cellImageView;
    return cell;
}

我猜这个问题在于我如何将Cell连接到CollectionView.

任何帮助将不胜感激!

Answer 1

您无法直接从故事板中的单元格创建segue,因为集合视图是通过数据源动态填充的.您应该使用collectionView:didSelectItemAtIndexPath:和以编程方式执行segue performSegueWithIdentifier:sender:.像这样的东西:

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    [self performSegueWithIdentifier:@"MySegueIdentifier" sender:self];
}

其中MySegueIdentifier是故事板中定义的segue的标识符.