使用UISearchBar+UITableView进行的时事检索功能的实现，及TabelView索引的实现

//
//  CityListViewController.m
//  WisdomShope
//
//  Created by mac on 15/12/26.
//  Copyright (c) 2015年 ZY. All rights reserved.
//

#import "CityListViewController.h"
#import "CitiesModel.h"
@interface CityListViewController ()<UITableViewDataSource,UITableViewDelegate,UISearchBarDelegate,UISearchResultsUpdating>

{
    //索引数组
    NSArray *sectionCityArray;
    //热门城市
    NSMutableArray *fistArray;
    //当前城市数组
    NSArray *currentArray;
    //所有城市的字典
    NSMutableDictionary *citiseDic;
    
    UITableView *cityTableView;
    
}
 // 根据searchController搜索的城市 盛放检索结果的数组
@property(strong, nonatomic) NSMutableArray *filteredCities;
// 所有城市数组,单独取出，以用于输入汉字检索
@property(strong, nonatomic) NSMutableArray *allCities;
 //所有城市的拼音数组
@property(strong, nonatomic) NSMutableArray *PYCities;

@end

@implementation CityListViewController


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
    
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        
        [self creatSubViews];
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.title = @"城市列表";
    
}

- (void)creatSubViews{
   
// 创建SearchBar
    UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(5, 64, kScreenW - 10, 50)];
    searchBar.barTintColor = [UIColor whiteColor];
    searchBar.placeholder = @"请输入城市中文名或拼音";
    searchBar.delegate = self;

//searchBar是否显示取消按钮
    searchBar.showsCancelButton = YES;
    searchBar.layer.cornerRadius = 10;
    searchBar.clipsToBounds = YES;
    searchBar.layer.borderWidth = 2;
    searchBar.layer.borderColor = [[UIColor grayColor] CGColor];
    [self.view addSubview:searchBar];
    
    cityTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 64 + 50, kScreenW, kScreenH - 64 - 50 - 49) style:UITableViewStylePlain];

    cityTableView.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:cityTableView];
    
    cityTableView.delegate = self;
    cityTableView.dataSource = self;
   
 //索引字符的颜色
    cityTableView.sectionIndexColor = [UIColor cyanColor];
    cityTableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
    
    //设置索引栏点击时的颜色
    cityTableView.sectionIndexTrackingBackgroundColor = [UIColor lightGrayColor];
    cityTableView.sectionIndexBackgroundColor = [UIColor whiteColor];
    
}

- (void)setCityListArray:(NSArray *)cityListArray{

    _cityListArray = cityListArray;
    
    _allCities = [[NSMutableArray alloc] init];
    _PYCities = [[NSMutableArray alloc] init];
    //索引数组，也是分组的头视图的内容
    sectionCityArray = @[@"当前",@"热门",@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"W",@"X",@"Y",@"Z"];
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSString *cityName = [defaults objectForKey:@"cityName"];
    currentArray = @[cityName];
    //热门城市数组
    fistArray = [[NSMutableArray alloc] init];

    citiseDic = [[NSMutableDictionary alloc] init];
    for (CitiesModel *model in _cityListArray) {
        
        NSMutableArray *cityArr = [citiseDic objectForKey:model.charindex];

        [_allCities addObject:model.name];
        
        //汉字转化为拼音 后面的方法是自己封装的汉字转拼音的方法，在最后会附上转化的代码
        NSString *resuString = [ChineseToEn chineseToEnglish:model.name];
        NSString *upStr = [resuString uppercaseString];
        [_PYCities addObject:upStr];
        
        if (!cityArr) {
            
            NSMutableArray *newArr = [[NSMutableArray alloc] init];
            [newArr addObject:model];
            [citiseDic setValue:newArr forKey:model.charindex];
            
        }else {
            
            [cityArr addObject:model];
        }
        
        if ([model.level isEqualToString:@"1"]) {
            
            [fistArray addObject:model];
            
            [citiseDic setObject:fistArray forKey:@"热门城市"];
        }
        
        
    }

    
    
    [cityTableView reloadData];
    
}
#pragma mark tableView Delegate
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    
    if(_filteredCities.count > 0){
        
        return 1;
    }
    
    return sectionCityArray.count;
    
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    
    if(_filteredCities.count > 0){
        
        return _filteredCities.count;
    }
    
    if (section == 0) {
        
        return currentArray.count;
    }else if (section == 1) {
        
        return fistArray.count;
    }
    
    NSString *name = sectionCityArray[section];
    NSArray *array = [citiseDic objectForKey:name];
    
    return array.count;
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    
    return 20;
}
//返回组的头视图
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
    if(_filteredCities.count > 0){
        
        return @"符合搜索类型的城市";
    }
    return sectionCityArray[section];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    static NSString *indentifier = @"cityCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:indentifier];
    
    if (!cell) {
        
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:indentifier];
        
    }
    cell.backgroundColor = [UIColor whiteColor];
    
    
    if(_filteredCities.count > 0){
        
        cell.textLabel.text = _filteredCities[indexPath.row];
        
        return cell;
    }
    
    if (indexPath.section == 0) {
        
        cell.textLabel.text = currentArray.firstObject;
    }else if (indexPath.section == 1) {
        CitiesModel *model = fistArray[indexPath.row];
        cell.textLabel.text = model.name;
    }else{
        
        NSString *name = sectionCityArray[indexPath.section];
        NSArray *array = [citiseDic objectForKey:name];
        CitiesModel *model = array[indexPath.row];
        cell.textLabel.text = model.name;
        
    }
    
    return cell;
}

#pragma mark tableViewCell的点击方法
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    [[NSNotificationCenter defaultCenter] postNotificationName:@"cityName" object:nil userInfo:@{@"city":cell.textLabel.text}];
    
    //城市名，放到属性列表中
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    [userDefaults setValue:cell.textLabel.text forKey:@"cityName"];
    [self.navigationController popViewControllerAnimated:YES];
    
}

//添加索引
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView{
    if(_filteredCities.count > 0){
        
        return @[@""];
    }
    
    return sectionCityArray;
}
#pragma mark 索引的点击事件
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index{
    
    [self showAlertViewShowTitle:title];
    
    return [sectionCityArray indexOfObject:title];
}

#pragma mark 索引点击时提示点击的索引位置
- (void)showAlertViewShowTitle:(NSString *)title{
    //创建label 用于显示点击索引栏时，点击的索引值
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(kScreenW/2-25, kScreenH/2 - 25, 50, 50)];
    
    label.backgroundColor = [UIColor grayColor];
    
    label.textAlignment = NSTextAlignmentCenter;
    
    label.font = [UIFont systemFontOfSize:35];
    
    if ([title isEqualToString:@"当前"]) {
        
        label.font = [UIFont systemFontOfSize:17];
    }
    if ([title isEqualToString:@"热门"]) {
        
        label.font = [UIFont systemFontOfSize:17];
    }
    
    label.text = title;
    label.tag = 20152808;
    [self.view addSubview:label];
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        

        [label removeFromSuperview];
        
    });
    
}

#pragma mark searchBar delegate
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
    
    [self.filteredCities removeAllObjects];
    NSPredicate *searchPredicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", searchText];
    self.filteredCities = [[self.allCities filteredArrayUsingPredicate:searchPredicate] mutableCopy];

    //根据拼音进行检索
    if (_filteredCities.count == 0) {
        
        NSString *upSeT = [searchText uppercaseString];
        
        for(int i = 0;i < _PYCities.count;i++){
            NSString *cityN = _PYCities[i];
            
            if ([cityN rangeOfString:upSeT].location != NSNotFound) {
                
                [_filteredCities addObject:_allCities[i]];
                
            }
            
        }

        
    }
    
    
    dispatch_async(dispatch_get_main_queue(), ^{
        
        [cityTableView reloadData];
        
    });
    
}
//点击取消按钮调用的方法
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{

    [searchBar resignFirstResponder];
}
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{
    
}

- (void)viewDidDisappear:(BOOL)animated{
    
    [super viewDidDisappear:animated];
    
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"city" object:nil];
}

@end

+ (NSString *)chineseToEnglish:(NSString *)str{
    
    NSString *resuStr;
    
    if (str.length > 0) {
        
        NSMutableString *mutableStr = [[NSMutableString alloc] initWithString:str];
        
        if (CFStringTransform((__bridge CFMutableStringRef)mutableStr, 0, kCFStringTransformMandarinLatin, NO)) {
            
        }
        
        if (CFStringTransform((__bridge CFMutableStringRef)mutableStr, 0, kCFStringTransformStripDiacritics, NO)) {
            
            resuStr = mutableStr;
            
        }
        
    }
    
    return resuStr;
    
}