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[英]UICollectionView's didSelectItemAtIndexPath method is called only once
[英]didSelectItemAtIndexPath method not working in a UICollectionView
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: viewDidLoad
[self.collectionCategories registerNib:[UINib nibWithNibName:@"CTMMenuCategoryCell" bundle:nil] forCellWithReuseIdentifier:@"Cell"];
self.collectionCategories.allowsMultipleSelection = NO;
self.collectionCategories.delegate = self;
self.collectionCategories.dataSource = self;
代表方法:
- (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的条款(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,我希望你可以帮我这个,我不知道我是否错过了一个方法或者我做错了什么。
谢谢
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];
}
至
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath;
{
CTMMenuCategoryCell *cell = (CTMMenuCategoryCell *)[self.collectionCategories cellForItemAtIndexPath:indexPath];
cell.categoryName.textColor = [UIColor redColor];
}
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
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