如何以不同的方法访问 uicollectionviewcell 对象？

Question

我有一个集合视图，我子class编辑了集合视图单元格，所以我有重复的内容。

在我的集合视图 class 中，我使用此方法访问和设置单元格中的对象，例如设置附加到单元格的标签？

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


CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CollectionViewCell" forIndexPath:indexPath];


//Configure Cell


//Set Name
DataManager *dm = [DataManager sharedInstance];
NSMutableArray *names = [dm objectForKey:@"nameArray"];
NSString *name = [names objectAtIndex:indexPath.row];
cell.textLabel.text = [NSString stringWithFormat:@"%@", name]; //set cell here

    return cell;
}

但是，我需要更新cell.textLabel，但我无法通过其他方法访问cell.textLabel？

如何使用除此之外的其他方法访问 cell.textLabel？

*注意，我想更新我所有的单元格，而不仅仅是一个单元格。

Answer 1

所以我建议您保留一个数组，其中包含您要更改的单元格的索引路径，然后每次您想要更改文本时调用一个方法并更改它们。这是我每次只更改一个单元格的方法。

-(void) makePriorCell:(NSIndexPath *) indexPath{

UICollectionViewCell *cell = [self.collectionView cellForItemAtIndexPath:indexPath];

//cell.backgroundColor = [UIColor greenColor];
UILabel *label = (UILabel *)[cell viewWithTag:101];

if (indexPath.item==0) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"2A copy.png"];


}
else if (indexPath.item==1) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"3A copy.png"];

}
else if (indexPath.item==2) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"4A copy.png"];

}
else if (indexPath.item==3) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"5A copy.png"];

}
else if (indexPath.item==4) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"5a_Istoria_Perivallon copy.png"];

}
else if (indexPath.item==5) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"7A copy.png"];

}
else if (indexPath.item==6) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"6A copy.png"];

}
else if (indexPath.item==7) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"8A copy.png"];

}
else if (indexPath.item==8) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"9A copy.png"];

}
else if (indexPath.item==9) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"10A copy.png"];

}
else if (indexPath.item==10) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"11A copy.png"];


}
else if (indexPath.item==11) {

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:@"12A copy.png"];


}


label.textColor = [UIColor blackColor];



cell.backgroundColor=[UIColor whiteColor];}

出于我的目的，我更改了指定单元格的图像、文本颜色和单元格背景。如果上面有标签，您可以对所需单元格的文本执行相同的操作。

Answer 2

您只能使用 visibleCells 方法访问 "visible" UICollectionViewCell。

对于那些 "invisible" 个单元格，您必须在 collectionView:cellForItemAtIndexPath 中配置它们。

Answer 3

你的 CollectionViewCell 只是视图，你应该从模型中给它信息并相应地更新，就像你在 - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

中所做的那样

我当时的建议是先更新您的模型，然后再更新您的单元格：

dm[@"nameArray"] = updated_info //Updated names
[DataManager sharedInstance] = ...//Update DataManager
collectionView.reloadData //Update all your cells

另外，在 cellForItemAtIndexPath: 方法中调用 DataManager *dm = [DataManager sharedInstance]; 时要小心。也许为此使用依赖注入会更好。你可以看到更多相关信息 here

如何以不同的方法访问 uicollectionviewcell 对象？

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