UICollectionView数据源方法未被调用，但正在init中设置 [英] UICollectionView datasource methods not getting called, but are being set in the init

问题描述

这是我的源代码

- (id)initWithCollectionView:(UICollectionView *)collectionView
{
self = [super init];

if (self)
{
    self.collectionView = collectionView;
    self.collectionView.dataSource = self;
    self.collectionView.delegate = self;
    [self.collectionView registerClass:[TWNTweetCell class] forCellWithReuseIdentifier:kCell];
    self.collectionViewLayout = self.collectionView.collectionViewLayout;



    self.tweetArray = @[];
    self.tweetTextArray = @[];

    self.twitter = [STTwitterAPI twitterAPIOSWithFirstAccount];
}

return self;
}

#pragma mark - CollectionView
#pragma mark DataSource

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:      (NSInteger)section
{
return [self.tweetArray count];
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
TWNTweetCell *cell = (TWNTweetCell *)[collectionView dequeueReusableCellWithReuseIdentifier:kCell forIndexPath:indexPath];

NSDictionary *status = [self.tweetArray objectAtIndex:indexPath.row];

NSString *text = [status valueForKey:@"text"];

cell.usernameLabel.text = screenName;
//    cell.createdAtLabel.text = dateString;

cell.autoresizingMask = UIViewAutoresizingFlexibleWidth;

UITextView *textView = [self.tweetTextArray objectAtIndex:indexPath.row];
[cell setTweet:text withTweetTextView:textView];

return cell;
}

所有方法都不会被断点中断。这些推文被加载到日志中，所以我知道其他一切都没问题，它只是没有识别集合视图。是的，我设置了

All the methods don't get interupted at all by breakpoints. The tweets are getting loaded in the log so I know everything else is ok, its just not recognizing the collection view. And yes i've set the

任何人都知道最新情况吗？

Anyone have any idea whats going on?

推荐答案

这不是你的情况，对于那些来这里遇到数据源方法没有被调用问题的人来说可能会有所帮助。它可以分配数据源，如：

It is not your case, it might be helpful for others who will came here having problem with data source methods not being called. It could be assigning data source like:

collectionView.dataSource = MyDataSource()

这是错误的，因为dataSource是一个弱引用，因此需要在创建它之后通过一些强引用存储它。在ViewController中添加了一个私有属性以保留强引用，初始化然后分配它可以解决问题。

which is wrong as dataSource is a weak reference so it needs to be stored by some strong reference to be alive after creating it. Added a private property in a ViewController to keep the strong reference, initialising and then assigning it fixes the issue.

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