IOS UI-UISearchController

ViewController.m

 //
 //  ViewController.m
 //  IOS_0224_查找联系人
 //
 //  Created by ma c on 16/2/24.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import "ViewController.h"
 #import "SearchResultsVC.h"

 @interface ViewController ()<UITableViewDataSource>

 @property (nonatomic, strong) UITableView *tableView;
 @property (nonatomic, strong) NSArray *keys;
 @property (nonatomic, strong) NSDictionary *dict;

 @property (nonatomic, strong) UISearchController *searchCtr;

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     [self createUI];

 }

 - (NSArray *)keys
 {
     if (_keys == nil) {
         NSString *path = [[NSBundle mainBundle] pathForResource:@"sortednames" ofType:@"plist"];
         self.dict = [NSDictionary dictionaryWithContentsOfFile:path];
         _keys = [[self.dict allKeys] sortedArrayUsingSelector:@selector(compare:)];
     }
     return _keys;
 }

 - (NSDictionary *)dict
 {
     if (_dict == nil) {
         NSString *path = [[NSBundle mainBundle] pathForResource:@"sortednames" ofType:@"plist"];
         self.dict = [NSDictionary dictionaryWithContentsOfFile:path];
     }
     return _dict;
 }

 - (void)createUI
 {
     [self setupTableView];
     [self setupSearchVC];
 }

 - (void)setupTableView
 {
     self.tableView = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStyleGrouped];
     self.tableView.backgroundColor = [UIColor groupTableViewBackgroundColor];
     self.tableView.dataSource = self;
     [self.view addSubview:self.tableView];
 }

 - (void)setupSearchVC
 {
     SearchResultsVC *resultVC = [[SearchResultsVC alloc] initWithDict:self.dict keys:self.keys];
     self.searchCtr = [[UISearchController alloc] initWithSearchResultsController:resultVC];

     self.searchCtr.searchResultsUpdater = resultVC;

     self.searchCtr.searchBar.placeholder = @"请输入搜索内容";
     [self.searchCtr.searchBar sizeToFit];
     self.tableView.tableHeaderView = self.searchCtr.searchBar;
 }

 #pragma mark - UITableViewDataSource

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {
     return self.keys.count;
 }

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
     NSString *key = self.keys[section];
     NSArray *value = self.dict[key];

     return [value count];
 }

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
     static NSString *identifier = @"cellIdentifier";

     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];

     if (!cell) {
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identifier];
     }
     NSString *key = self.keys[indexPath.section];
     NSArray *value = self.dict[key];

     cell.textLabel.text = value[indexPath.row];
     return cell;
 }

 - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
 {
     return self.keys[section];
 }
 - (NSArray<NSString *> *)sectionIndexTitlesForTableView:(UITableView *)tableView
 {
     return self.keys;
 }

 @end

SearchResultsVC.m

 //
 //  SearchResultsVC.m
 //  IOS_0224_查找联系人
 //
 //  Created by ma c on 16/2/24.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import "SearchResultsVC.h"

 @interface SearchResultsVC ()

 @property (strong, nonatomic) NSDictionary *dict;
 @property (strong, nonatomic) NSArray *keys;
 @property (strong, nonatomic) NSMutableArray *searchList;

 @end

 @implementation SearchResultsVC

 - (instancetype)initWithDict:(NSDictionary *)dict keys:(NSArray *)keys {
     if (self = [super initWithStyle:UITableViewStylePlain]) {
         self.dict = dict;
         self.keys = keys;
         self.searchList = [[NSMutableArray alloc] init];
     }
     return self;
 }

 - (void)viewDidLoad {
     [super viewDidLoad];
 }

 - (void)updateSearchResultsForSearchController:(UISearchController *)searchController
 {
     NSString *searchString = [searchController.searchBar text];
     NSLog(@"searchString:%@",searchString);
     [self.searchList removeAllObjects];

     if (searchString.length > ) {

 //        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@",searchString];
         NSPredicate *predicate =
         [NSPredicate predicateWithBlock:^BOOL(id  _Nonnull evaluatedObject, NSDictionary<NSString *,id> * _Nullable bindings) {

             NSRange range = [evaluatedObject rangeOfString:searchString
                                         options:NSCaseInsensitiveSearch];

             return range.location != NSNotFound;
         }];

         for (NSString *key in self.keys) {
             NSArray *matches = [self.dict[key]
                                 filteredArrayUsingPredicate: predicate];
             [self.searchList addObjectsFromArray:matches];
         }
         [self.tableView reloadData];
     }
 }

 #pragma mark - UITableViewDataSource

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

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

     static NSString *identifier = @"cellIdentifier";
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];

     if (!cell) {
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identifier];
     }
     cell.textLabel.text = self.searchList[indexPath.row];
     return cell;
 }
 @end