Question

在我的应用中，我使用PSCollectionView来获得自定义集合视图。我已准备好创建视图的所有数据，但是当我执行代码时，它不会调用方法

- (PSCollectionViewCell *)collectionView:(PSCollectionView *)collectionView cellForRowAtIndex:(NSInteger)index`

我在stackoverflow上搜索，我发现另一个人有同样的问题（link），但我不明白他是如何解决的，所以我决定写一个问题来理解如何调用这个方法。我希望有人可以帮助我找到解决这个问题的方法。

更新：

以下是viewDidLoad代码：

- (void)viewDidLoad
{
    [super viewDidLoad];

    tempArray = [[NSMutableArray alloc]init];
    self.navBar.title = self.category;
    NSString *stringUrl = [NSString stringWithFormat:@"http://54.204.6.246/magento8/api/rest/products/?category_id=%d", self.categoryId];
    [self sendRequestToURL:stringUrl withMethod:@"GET"];
    // Inizio sezione di codice per la creazione della PSCOLLECTIONVIEW
    psView = [[PSCollectionView alloc]init];
    // Imposto il delegato per la gestione della scrollView
    psView.delegate = self;
    // Imposto il delegato per la collection view
    psView.collectionViewDelegate = self;
    // Imposto il delegato per il data source della collection view
    psView.collectionViewDataSource = self;

    psView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

    // Controllo il tipo di device e a seconda del dispositivo trovato creo le colonne e le righe
    if ([[UIDevice currentDevice].model isEqualToString:@"iPhone"]) {
        psView.numColsPortrait = 2;
        psView.numColsLandscape = 4;
    } else {
        psView.numColsPortrait = 2;
        psView.numColsLandscape = 4;
    }

    // Aggiungo la vista appena creata
    [self.view addSubview:psView];
}

这是委托代码：

#pragma mark - PSCollection Delegate e Data Source

- (NSInteger)numberOfRowsInCollectionView:(PSCollectionView *)collectionView {
    return [self.arrayWithData count];
}

- (CGFloat)collectionView:(PSCollectionView *)collectionView heightForRowAtIndex:(NSInteger)index {
//    NSDictionary *item = [self.arrayWithData objectAtIndex:index];
//    
//    return [ProductViewCell heightForViewWithObject:item inColumnWidth:psView.colWidth];
    return 100.0f;
}

- (PSCollectionViewCell *)collectionView:(PSCollectionView *)collectionView cellForRowAtIndex:(NSInteger)index {
    ProductViewCell *cell = (ProductViewCell *)[psView dequeueReusableViewForClass:nil];
    if (!cell) {
        cell = [[ProductViewCell alloc]initWithFrame:CGRectZero];
    }
    cell.labelName.text = [[self.arrayWithData objectAtIndex:index]objectForKey:@"name"];
    NSURL * url = [NSURL URLWithString:[[self.arrayWithData objectAtIndex:index]objectForKey:@"url"]];

    [cell.productImage setImageWithURL:url
                             completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {

                                 //[[[SDWebImageManager sharedManager] imageCache] removeImageForKey:yacht.thumbnail fromDisk:NO];
                                 [[[SDWebImageManager sharedManager] imageCache] clearMemory];


                             }];
    return cell;
}

Answer 1

必须存在委托问题。看@Github使用示例：

self.collectionView = [[PSCollectionView alloc] initWithFrame:CGRectZero];
self.collectionView.delegate = self; // This is for UIScrollViewDelegate
self.collectionView.collectionViewDelegate = self;
self.collectionView.collectionViewDataSource = self;
self.collectionView.backgroundColor = [UIColor clearColor];
self.collectionView.autoresizingMask = ~UIViewAutoresizingNone;

所以你必须设置委托3次。你已经分配了所有这些吗？

另一件事。基于Github中的文档：

- (Class)collectionView:(PSCollectionView *)collectionView cellClassForRowAtIndex:(NSInteger)index {
    return [PSCollectionViewCell class];
}

- (NSInteger)numberOfRowsInCollectionView:(PSCollectionView *)collectionView {
    return 0;
}

- (UIView *)collectionView:(PSCollectionView *)collectionView cellForRowAtIndex:(NSInteger)index {
    return nil;
}

- (CGFloat)collectionView:(PSCollectionView *)collectionView heightForRowAtIndex:(NSInteger)index {
    return 0.0;
}

检查是否正在调用所有其他方法。检查numberOfRowsInCollectionView的输出，因为如果您在此方法中返回0，则永远不会调用cellForRowAtIntex:。

修改尝试换行：

psView = [[PSCollectionView alloc]init];

要：

psView = [[PSCollectionView alloc] initWithFrame:CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height)];

这应该让你全屏PSCollectionView。

Answer 2

看起来你必须为你的collectionView设置dataSource到你实现cellForRowAtIndex的类，例如：

collectionView.dataSource = self;

PSCollectionView不会执行cellForRowAtIndex

2 个答案: