ios - Collection View 由于某种原因崩溃

Question

    //collection view
    UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];
    self.collectionView=[[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:layout];
    [self.collectionView setDataSource:self];
    [self.collectionView setDelegate:self];

    [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cellIdentifier"];
    [self.collectionView setBackgroundColor:[UIColor redColor]];

    [self.view addSubview:self.collectionView];

 }



- (NSInteger)collectionView:(UICollectionView *)tcollectionView numberOfItemsInSection:(NSInteger)section
{
    return 15;
}


// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];

    cell.backgroundColor=[UIColor greenColor];
    return cell;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    return CGSizeMake(50, 50);
}

崩溃:

 -[NSISUnrestrictedVariable collectionView:numberOfItemsInSection:]: unrecognized selector sent to instance 0x7fce804111b0

那是什么？(collection view在view controller里面，他在scrollview里面)

Answer 1

看起来您的 UICollectionView 已从内存中释放，但您仍在尝试访问它。

启用NSZombies，您将看到调用释放内存的位置并相应地修复代码。