Question

我正在创建一个UICollectionView，当我选择一个单元格时，我遇到了一个问题，我认为函数didSelectItemAtIndexPath没有被调用。

我的部分代码是：的 viewDidLoad中

[self.collectionCategories registerNib:[UINib nibWithNibName:@"CTMMenuCategoryCell" bundle:nil] forCellWithReuseIdentifier:@"Cell"];
self.collectionCategories.allowsMultipleSelection = NO;
self.collectionCategories.delegate = self;
self.collectionCategories.dataSource = self;

委托方法：

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

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    CTMMenuCategoryCell *cell = (CTMMenuCategoryCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
    if (cell == nil) {
        cell = [[CTMMenuCategoryCell alloc] init];
    }

    CTMCategory *categoria = [categoriesArray objectAtIndex:indexPath.row];
    cell.categoryName.text = categoria.name;    
    return cell;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    CGSize calCulateSizze = [(NSString*)[[categoriesArray objectAtIndex:indexPath.row] valueForKey:@"name"] sizeWithAttributes:NULL];
    calCulateSizze.height = 64;
    calCulateSizze.width = calCulateSizze.width+80;
    return calCulateSizze;
}

- (void)tableView:(UICollectionView *)tableView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    CTMMenuCategoryCell *cell = (CTMMenuCategoryCell *)[self.collectionCategories cellForItemAtIndexPath:indexPath];
    cell.categoryName.textColor = [UIColor redColor];
}

自定义Cell的clases（它还有一个xib文件）：

// .h

#import <UIKit/UIKit.h>
@interface CTMMenuCategoryCell : UICollectionViewCell

@property (weak, nonatomic) IBOutlet UILabel *categoryName;

@end


//.m
#import "CTMMenuCategoryCell.h"

@implementation CTMMenuCategoryCell

- (void)awakeFromNib {
    self.categoryName.textColor = [UIColor whiteColor];
    [self.categoryName.superview sizeToFit];
}

- (void)prepareForReuse
{
    [super prepareForReuse];
    self.categoryName.text = nil;
}

@end

我需要更改标签的属性textColor，希望你能帮我解决这个问题，我不知道我是否错过了某种方法，或者我是否做错了。

谢谢

Answer 1

您已创建了集合视图并已为其实现了委托，但您已在表视图上实现了委托方法didSelectItemAtIndexPath

所以，你需要改变

- (void)tableView:(UICollectionView *)tableView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    CTMMenuCategoryCell *cell = (CTMMenuCategoryCell *)[self.collectionCategories cellForItemAtIndexPath:indexPath];
    cell.categoryName.textColor = [UIColor redColor];
}

到

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath;
{
    CTMMenuCategoryCell *cell = (CTMMenuCategoryCell *)[self.collectionCategories cellForItemAtIndexPath:indexPath];
    cell.categoryName.textColor = [UIColor redColor];
}

Answer 2

UICollectionViewDelegate协议定义了一些方法，允许您管理集合视图中项目的选择和突出显示，并对这些项目执行操作。

您需要确认UICollectionViewDelegate协议才能使用didSelectItemAtIndexPath方法

didSelectItemAtIndexPath方法不在UICollectionView中工作

2 个答案: