iOS:未触发Storyboard CollectionView segue [英] iOS: Storyboard CollectionView segue not being triggered

问题描述

我在导航控制器中嵌入了一个UICollectionView控制器.collectionView会列出项目，并且每个单元格都应该连接到ProjectDetail屏幕.

I have a UICollectionView controller embedded inside a navigation controller. The collectionView lists projects and each cell is supposed to segue to a ProjectDetail screen.

我根本无法触发选择.如果我只是在导航栏上单击一个按钮，然后将一个按钮连接到该细节，则它会起作用.但是不会从我的CollectionView单元中触发.

I simply cannot get the segue to trigger. If I simply drop a button on the nav bar and hook up a segue to the detail, it works. But triggering from my CollectionView cell doesn't.

这是情节提要的样子: http://cl.ly/RfcM 我确实有一个秘密从CollectionViewCell连接到ProjectDetailViewController

Here is what the storyboard looks like: http://cl.ly/RfcM I do have a segue hooked up from the CollectionViewCell to the ProjectDetailViewController

这是我的ProjectDetailViewController内部的相关代码:

Here's the relevant code inside my ProjectDetailViewController:

@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;
}

我猜测问题出在将单元格连接到CollectionView的方式上.

I'm guessing the problem is somewhere in how I'm hooking up the Cells to the CollectionView.

任何帮助将不胜感激！

推荐答案

您不能直接从情节提要中的单元格创建segue，因为collectionview是通过数据源动态填充的.您应该使用

You cannot create segues directly from cells in a storyboard because the collectionview is populated dynamically through the data source. You should use the collectionView:didSelectItemAtIndexPath: and perform the segue programatically using performSegueWithIdentifier:sender:. Something like this:

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

其中 MySegueIdentifier 是情节提要中定义的segue的标识符.

where MySegueIdentifier is the identifier of the segue defined in storyboard.

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