Question

我有一个字典数组，第一个键作为图像。我正在使用 UIViewController 作为数据源。

@interface myViewController () {
    NSMutableArray *textureArray1;
    NSMutableDictionary *dict1;
    UIImage *key1a; // UIImage
    NSString *key1b; // texture name
}

在使用UIViewController中布置的 TableView 控件填充此字典数组时，我没有遇到任何问题。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    }
    UIImage *image = [[textureArray1 objectAtIndex:indexPath.row] objectForKey:key1a];
    cell.textLabel.text = [[textureArray1 objectAtIndex:indexPath.row] objectForKey:key1b];
    cell.imageView.image = image;
    return cell;
}

我想做点新事。我想用 UICollectionView 填充相同的图像数组，其中，UIViewController也是数据源。不幸的是，我在Internet上找到的许多教程都有UICollectionViewController作为数据源。无论如何，我有以下几行代码。

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
    cell.backgroundColor = [UIColor colorWithPatternImage:[[textureArray1 objectAtIndex:indexPath.row] objectForKey:key1b]];
    return cell;
}

应用程序崩溃时出现“无法识别的选择器发送到实例...”的错误。好吧，我不知道如何使用UICollectionView。那么如何将UICollectionView与UIViewController一起使用？

感谢您的帮助。

P.S。以下是错误消息。

2013-03-20 10:21:07.777 iPadapp[2023:c07] -[__NSCFString _tiledPatternColor]: unrecognized selector sent to instance 0xdeacdf0
2013-03-20 10:21:07.778 iPadapp[2023:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString _tiledPatternColor]: unrecognized selector sent to instance 0xdeacdf0'

Answer 1

您需要在标题中说明UIViewController是UICollectionViewDataSource和UICollectionViewDelegate。 See this answer

Answer 2

这是一个简单的例子。您的viewController应符合UICollectionViewDelegate和UICollectionViewDelegateFlowLayout

- (void)viewDidLoad
{
   [super viewDidLoad];

    // Create the collection view and add it as a sub view 
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];

layout.itemSize = CGSizeMake(120, 120);
layout.sectionInset = UIEdgeInsetsMake(20, 20, 20, 20);
layout.minimumInteritemSpacing =10.0f;
layout.minimumLineSpacing = 10.0f;

    self.collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:layout];
self.collectionView.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
self.collectionView.backgroundColor = [UIColor whiteColor];
self.collectionView.delegate = self;
self.collectionView.dataSource = self;

[self.collectionView registerClass:[UICollectionViewCell  class] forCellWithReuseIdentifier:@"cell"];

[self.view addSubview:self.collectionView];
}

 // Implement the required data source methods
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
 {
  return 50;
 }


   - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

  {
     static NSString *cellId =@"cell";
     CustomCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellId forIndexPath:indexPath];

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

使用UIViewController作为数据源的UICollectionView

2 个答案: