如何为集合视图设置搜索栏

Question

我正在使用情节提要开发一个 iPad 应用程序。在我的情节提要中，我有两个名称为 nameCollectionView 和 dataColletionView 的集合视图和一个名称为 languageTableView 的表格视图。我需要为nameCollectionView 实现搜索栏。对于这个CollectionView，我使用来自resultArray 的数据配置单元格。

我的第一个问题是：
1) 是否可以为收藏视图设置搜索栏？
2) 如何为我的姓名收藏视图设置搜索栏？

有人帮我实现了以下功能。

Answer 1

CollectionView + SearchBar 与 Swift3 + Storyboard 实现。

创建标题视图：

创建搜索栏：

创建可重用视图自定义类

设置可复用视图自定义类

创建搜索栏出口

技巧：将搜索栏代理连接到 COLLECTION VIEW 类，搜索栏出口转到 CUSTOM REUSABLE VIEW CLASS

实现协议的CollectionView头方法

    override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {

         if (kind == UICollectionElementKindSectionHeader) {
             let headerView:UICollectionReusableView =  collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "CollectionViewHeader", for: indexPath)

             return headerView
         }

         return UICollectionReusableView()

    }

设置搜索栏委托

    class MyCollectionViewController: (other delegates...), UISearchBarDelegate {

最后，您的搜索栏委托方法将在您的 CollectionView 类中调用

//MARK: - SEARCH

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    if(!(searchBar.text?.isEmpty)!){
        //reload your data source if necessary
        self.collectionView?.reloadData()
    }
}

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    if(searchText.isEmpty){
        //reload your data source if necessary
        self.collectionView?.reloadData()
    }
}

Answer 2

你也应该这样尝试：

- (void)searchBar:(UISearchBar *) searchBar textDidChange:(NSString *)searchText {
if (searchBar.text && [searchBar.text length]) {
    NSPredicate *filterPredicate = [NSPredicate predicateWithFormat:@"name CONTAINS[cd] %@", searchBar.text];
    self.filteredData= [self.allData filteredArrayUsingPredicate:filterPredicate];

} else {
    self.filteredData = allData;
}

[nameCollectionView reloadData];

}

Answer 3

1. 可以。 2. 在这里：

===================================

#pragma mark - Search Bar Delegate
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
    isSearching = true; }

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
    //Remove first
    [self.filteredNames removeAllObjects];
    [self.filteredSections removeAllObjects];

    if([searchText length] != 0) {
        isSearching = true;
        // Filter the array using NSPredicate

        for (int i = 0; i<[self.allNames count]; i++) {
            NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.name contains[c] %@",searchText];
            NSArray *predicatedArray = [NSMutableArray arrayWithArray:[self.allNames[i] filteredArrayUsingPredicate:predicate]];

            if([predicatedArray count] != 0){
                [self.filteredNames addObject:predicatedArray];
                [self.filteredSections addObject:[self.orderedSections objectAtIndex:i]];
            }
        }
    }
    else {
        isSearching = false;
        self.filteredNames = [NSMutableArray arrayWithArray:self.allNames];
        self.filteredSections = [NSMutableArray arrayWithArray:self.orderedSections];
    }
    [self.collectionView reloadData]; }

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar { }

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    [searchBar resignFirstResponder]; }






#pragma mark - Collection Delegate Methods
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return [self.filteredNames count]; }

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return [[self.filteredNames objectAtIndex:section] count]; }

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{

    UICollectionReusableView *reusableview = nil;


    //Header
    //if (kind == UICollectionElementKindSectionHeader)
    NamesListCollectionHeaderView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"NamesListCollectionHeaderView" forIndexPath:indexPath];
    if (headerView==nil) {
        headerView  = [[[NSBundle mainBundle] loadNibNamed:@"NamesListCollectionHeaderView" owner:self options:nil] objectAtIndex:0];
    }
    if (self.filteredSections.count != 0) {
        //Text
        headerView.title.text=[self.filteredSections objectAtIndex:indexPath.section];
    }else{
        headerView.title.text=@"";
    }

    reusableview = headerView;
    return reusableview;

    //Footer
    //if (kind == UICollectionElementKindSectionFooter) {}

    return nil;
     }

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

    //Init of the Cell
    NameCollectionCellController *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"NameCollectionCell" forIndexPath:indexPath];
    if(cell == nil){
        cell = [[NameCollectionCellController alloc]initWithFrame:CGRectMake(0.0f, 0.0f, 140.0f, 160.0f)];
    }

    //Name
    Name *curName;

    curName = [[self.filteredNames objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];

    //Set Cell
    [cell setCell];

    //Set Selected
    if (curName == ((NamesViewController*)self.parentViewController).curName) {
        [cell setSelected:YES];
        [cell setSelectedBorder];
    }else{
        [cell setDeselected];
        [cell setSelected:NO];
    }

    //Title
    cell.nameValueLabel.text = curName.name;

    return cell; }

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{

    [self collectionView:self.collectionView didDeselectItemAtIndexPath:self.curIndexPath];

    //Set Cur Name
    if ([self. filteredNames count]>0) {

        self.curIndexPath = indexPath;
        ((NamesViewController*)self.parentViewController).curName
= [[self.filteredNAmes objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];

        self.curCell = (NameCollectionCellController *)[collectionView cellForItemAtIndexPath:indexPath];
        [self.curCell setSelectedBorder];
        [self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionCenteredVertically animated:YES];

        [self.collectionView reloadData];

        [[NSNotificationCenter defaultCenter] postNotificationName:@"didSelectNameNotification" object:self];
    } }

-(void) collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath{
    if (indexPath!=nil) {
        [self.curCell setDeselected];
    } }