iOS8之后搜索框的常规实例

1、在一个二级导航控制器中添加一个UITableviewController作为子控制器
2、UITableviewController.tableView 作为展示结果
3、利用iOS之后的UISearchController 根据输入更新输入结果

@interface WJWSearchViewController ()<UISearchResultsUpdating,UITableViewDelegate,UITableViewDataSource>

@property (nonatomic, strong) UITableViewController *searchTableViewController;
@property (nonatomic, strong) UISearchController *searchController;
@property (nonatomic, strong) NSMutableArray *dataArray;
@property (nonatomic, strong) NSMutableArray *searchList;

@end

@implementation WJWSearchViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];

    
    
    [self addChildViewController:self.searchTableViewController];
    [self initDataArray];
    [self configUI];
}

- (void)initDataArray{
    [self.dataArray addObject:@"runLoop"];
    [self.dataArray addObject:@"gcd"];
    [self.dataArray addObject:@"timer"];
    [self.dataArray addObject:@"sideBar"];
    [self.dataArray addObject:@"searchBar"];
    [self.dataArray addObject:@"fmdb"];
    [self.dataArray addObject:@"afnetworking"];
}

- (void)configUI {
    
    [self.view addSubview: self.searchTableViewController.tableView];
    self.searchTableViewController.tableView.frame = self.view.frame;
}

#pragma mark ---UITableViewDataSource---
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.searchController.active) {
        return [self.searchList count];
    }else {
        return self.dataArray.count;
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *searchCellId = @"SearchCellID";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:searchCellId];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:searchCellId];
    }
    if (self.searchController.active) {
        [cell.textLabel setText:self.searchList[indexPath.row]];
    }else {
        [cell.textLabel setText:self.dataArray[indexPath.row]];
    }
    return cell;
}


#pragma mark ----UISearchResultsUpdating----

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {
    NSString *searchString = [self.searchController.searchBar text];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", searchString];
    if (self.searchList != nil) {
        [self.searchList removeAllObjects];
    }
    //过滤数据
    self.searchList = [NSMutableArray arrayWithArray:[_dataArray filteredArrayUsingPredicate:predicate]];
    //刷新表格
    [self.searchTableViewController.tableView reloadData];
}


-(UISearchController *)searchController {
    if (!_searchController) {
        _searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
        _searchController.searchResultsUpdater = self;
        _searchController.dimsBackgroundDuringPresentation = NO;
        _searchController.hidesNavigationBarDuringPresentation = YES;//搜索框编辑时隐藏导航栏
        _searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, _searchController.searchBar.frame.origin.y, _searchController.searchBar.frame.size.width, 44.0);
        self.searchTableViewController.tableView.tableHeaderView = _searchController.searchBar;
    }
    return _searchController;
}

- (NSMutableArray *)dataArray {
    if (!_dataArray) {
        _dataArray = [NSMutableArray array];
    }
    return _dataArray;
}

- (UITableViewController *)searchTableViewController {
    if (!_searchTableViewController) {
        _searchTableViewController = [[UITableViewController alloc] init];
        _searchTableViewController.tableView.delegate = self;
        _searchTableViewController.tableView.dataSource = self;
    }
    return _searchTableViewController;
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

遇到的问题：
模拟器无法中文输入，
解决方法：
1、在Xcode中给项目的Scheme设置目标项目的 所属区域。默认一般使系统，可以设置为china。edit scheme-> option ->application region :china
2、在模拟器中的通用->语言地区->iPhone : 简体中文

思考：关于拼音搜索，首字母搜索，等模糊搜索未实现。