UISearchController使用

iOS8之前我們使用UISearchDisplayController做TableView的本地搜索

iOS8提供實現搜索功能的SDK：UISearchController（iOS8.0之后）、UISearchDisplayController（iOS8.0之前，iOS8.0之后不建議再使用）。

遵守UISearchResultsUpdating協議

@interface ZWRecommendationFocusViewController()<UISearchResultsUpdating>
@property (strong, nonatomic) NSArray *list;
@property (strong, nonatomic) NSMutableArray *searchList;
@property (strong, nonatomic)UISearchController *searchController;
@end

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return (!self.searchController.active)?1:1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return (!self.searchController.active)?self.list.count:self.searchList.count;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    ZWFocusList *list=(!self.searchController.active)?self.list[indexPath.row]:self.searchList[indexPath.row];
    static NSString *identifier = @"cell";
    ZWFocusListTableViewCell *cell = [ZWFocusListTableViewCell cellWithTableView:tableView identifier:identifier];
    cell.list = list;
    return cell;
}

 

/**
 *  UISearchController作為UITableView的tableHeaderView
 */
-(void)addSearchBar
{
    //創建UISearchController對象
    UISearchController *searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
    //是否添加半透明覆蓋層。為YES，搜索時，背景會變暗（背景變模糊）。默認為YES
    searchController.dimsBackgroundDuringPresentation = NO;
    //是否隱藏導航欄。為YES，搜索時，UINavigationBar會隱藏。默認為YES
    searchController.hidesNavigationBarDuringPresentation = YES;
    //NO表示UISearchController在present時，可以覆蓋當前controller。默認為NO
    searchController.definesPresentationContext = NO;
    //搜索欄表頭視圖
    self.tableView.tableHeaderView = searchController.searchBar;
    
    [searchController.searchBar sizeToFit];
    searchController.searchResultsUpdater = self;
    
    searchController.searchBar.placeholder=@"請輸入名稱或者數字";
    searchController.searchBar.autocapitalizationType=UITextAutocapitalizationTypeNone;
    //    searchController.searchBar.showsCancelButton=YES;//顯示取消按鈕
    //自適應
    [searchController.searchBar sizeToFit];
    //    searchController.searchBar.frame = CGRectMake(0, 0, 0, 44);
    //    searchController.searchBar.prompt=@"請輸入關鍵字";
    self.searchController = searchController;
}

 

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{
    NSString *searchString = self.searchController.searchBar.text;
    //NSPredicate 謂詞
    NSPredicate *preicate = [NSPredicate predicateWithFormat:@"theme_name LIKE[c] %@", searchString];
    if (self.searchList!= nil) {
        [self.searchList removeAllObjects];
    }
    //過濾數據
    self.searchList= [NSMutableArray arrayWithArray:[self.list filteredArrayUsingPredicate:preicate]];
    //刷新表格
    [self.tableView reloadData];
}