IOS基于 fmdb数据库 的简单操作应用

　　苹果给我们自带了sqlite ,但是用起来非常不友好,所以呢,一些大神在他原来的基础上封装了一层 FMDB libsqlite3.tbd

　　今天,我们就来做一个简单的基于 FMDB 的数据库基本操作

　　首先,我们应该去下载FMDB工程项目https://github.com/ccgus/fmdb.git 

　　下载下来的是一个demo，大家可以把src文件夹拖出来再改名为FMDB，拖进自己的项目中就行了

　　在项目里添加libsqlite3.dylib(xcode7的朋友添加 libsqlite3.tbd )，还有头文件#import "FMDatabase.h"(#import "FMDatabaseQueue.h")这个我们现在还是用不到,先不去管它了,我们先来看看他的效果

　　

　　看到了,我们要做的有三个界面,第一个是就是简单的通讯录了,第二个是添加界面,第三了就是 search了

　　里面有一个我自己封装的XFNotices 这个其实很简单,我先贴上源码 或者你们直接在 demo 中抠出来

线上 Code4App demo 地址: FMDB 基本使用 

　　先说一下,我这是用 frame 布局,没有任何 SB XIB 直接贴到工程中即可使用

　　我们先把主体框架搭建好

　　首先,我们应该先写一个单例,原因我就不一一概述了

　　创建继承与 NSObject 的文件

　　#import "YXFDataFromDataBase.h"

#import <Foundation/Foundation.h>

@interface YXFDataFromDataBase : NSObject

@property(retain,nonatomic) NSString *nameFromClass;

@property(retain,nonatomic)NSString *ageFromClass;

@property(retain,nonatomic)NSString *IDFromClass;

@property(retain,nonatomic)NSMutableArray *nameArrayFromClass;

+(YXFDataFromDataBase *)shareFromDataBase;

@end

　　#import "YXFDataFromDataBase.m"

#import "YXFDataFromDataBase.h"

@implementation YXFDataFromDataBase

+ (YXFDataFromDataBase *)shareFromDataBase
{
    static YXFDataFromDataBase *sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        
        if (sharedInstance == nil) {
            sharedInstance = [[YXFDataFromDataBase alloc] init];
        }
        
    });
    return sharedInstance;
}

- (instancetype)init {
    self = [super init];
    if (self) {
        _nameFromClass = @"";
        _ageFromClass = @"";
        _IDFromClass = @"";
        _nameArrayFromClass = [[NSMutableArray alloc]initWithCapacity:0];
    }
    return self;
}

@end

　　好了,单例写好了,以后我们用起来超级方便了哦!!!

　　接着,在 AppDelegate.m 的头文件中 引入:

　　#import "YXFAddressViewController.h" 

　　#import "YXFAddUserViewController.h"

　　#import "YXFSearchViewController.h"

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    
    UITabBarController *tabbar = [[UITabBarController alloc] init];
    
    YXFAddressViewController *addressVC = [[YXFAddressViewController alloc] init];
    UINavigationController *addressNC = [[UINavigationController alloc] initWithRootViewController:addressVC];
    addressNC.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemContacts tag:101];
    
    YXFAddUserViewController *addUserVC = [[YXFAddUserViewController alloc] init];
    UINavigationController *addUserNC = [[UINavigationController alloc] initWithRootViewController:addUserVC];
    addUserNC.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:102];
    
    YXFSearchViewController *searchVC = [[YXFSearchViewController alloc] init];
    UINavigationController *searchNC = [[UINavigationController alloc] initWithRootViewController:searchVC];
    searchNC.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemSearch tag:103];
    
    
    tabbar.viewControllers = @[addressNC,addUserNC,searchNC];
    
    self.window.rootViewController = tabbar;
    
    return YES;
}

　　接下来就是创建第一个通讯录 VC

创建一个 UITableViewController 就可以了  还有有一个自定义的 UITableViewCell

　　#import "YXFAddressViewController.h"

#import <UIKit/UIKit.h>

@interface YXFAddressViewController : UITableViewController

@property (nonatomic, strong) NSString *paths;

@property (nonatomic, strong) NSMutableArray *nameArray;

@property (nonatomic, strong) NSMutableArray *ageArray;

@property (nonatomic, strong) NSMutableArray *IDArray;

@end

 　　#import "YXFAddressViewController.m"

#import "YXFAddressViewController.h"
//这个是自己写的一个提示框
#import "XFNotices.h"
#import "FMDatabase.h"

#import "FMDatabaseQueue.h"

#import "YXFAddressViewCell.h"

#import "YXFDataFromDataBase.h"

#import "YXFAddUserViewController.h"

@interface YXFAddressViewController ()

@end

@implementation YXFAddressViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    [self.tableView registerClass:[YXFAddressViewCell class] forCellReuseIdentifier:@"cell"];
 
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem  alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(modifyDatabase)];
    
}

- (void)viewWillAppear:(BOOL)animated
{
    
    NSString *document = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
    NSString *path = [document stringByAppendingPathComponent:@"USER.sqlite"];
    self.paths = path;
//注意以上三句话是获取数据库路径必不可少的，在viewDidload之前就已经准备好了
    self.nameArray = [[NSMutableArray alloc]init];
    self.ageArray = [[NSMutableArray alloc]init];
    self.IDArray = [[NSMutableArray alloc]init];
    [self createTable];
    [self getAllDatabase];
}


#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.nameArray.count + 1;
}

- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.row == 0) {
        return nil;
    }else
    {
        return indexPath;
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    YXFAddressViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];

    if (indexPath.row == 0) {
        cell.nameLabel.text = @"姓名";
        cell.ageLabel.text = @"年龄";
        cell.ID.text = @"ID";
    }else
    {
        cell.nameLabel.text = [self.nameArray objectAtIndex:indexPath.row -1];
        cell.ageLabel.text = [self.ageArray objectAtIndex:indexPath.row - 1];
        cell.ID.text = [self.IDArray objectAtIndex:indexPath.row - 1];
    }
    
    
    return cell;
}

- (void)createTable
{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if (![fileManager fileExistsAtPath:self.paths]) {
        NSLog(@"表不存在，创建表");
        FMDatabase *db =[FMDatabase databaseWithPath:self.paths];
        if ([db open]) {
            NSString *sql = @"CREATE TABLE 'USER'('id' INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, 'name' VARCHAR(20),'age' VARCHAR(20),'idcode' VARCHAR(30))    ";//sql语句
            BOOL success = [db executeUpdate:sql];
            if (!success) {
                NSLog(@"error when create table ");
            }else{
                NSLog(@"create table succeed");
            }
            [db close];
        }else{
            NSLog(@"database open error");
        }
    }
}

- (void)getAllDatabase//从数据库中获得所有数据
{
    FMDatabase *db = [FMDatabase databaseWithPath:self.paths];
    if ([db open]) {
        NSString *sql = @"SELECT * FROM USER";
        FMResultSet *rs = [db executeQuery:sql];
        while ([rs next]) {
            NSString *name = [rs stringForColumn:@"name"];
            NSString *age = [rs stringForColumn:@"age"];
            NSString *ID = [rs stringForColumn:@"idcode"];
            
            [self.nameArray addObject:name];
            [self.ageArray addObject:age];
            [self.IDArray addObject:ID];
        }
        [[YXFDataFromDataBase shareFromDataBase].nameArrayFromClass arrayByAddingObjectsFromArray:self.nameArray];
        NSLog(@"self.nameArray==%@",self.nameArray);
        [db close];
        [self.tableView reloadData];
    }
    
}

//选中相应的行，进入更新界面，注意这里没有对数据库进行操作
- (void)modifyDatabase
{
    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    
    if (indexPath == nil) {

        [XFNotices noticesWithTitle:@"数据更新" Time:1.5 View:self.view Style:(XFNoticesStyleSuccess)];
        
        return;
    }
    else{
        YXFAddUserViewController *addUser = [[YXFAddUserViewController alloc]init];
        addUser.operateType = 1;
        //下面的方法是将选中的行的数据存进单例，再传到另一个类里面
        [YXFDataFromDataBase shareFromDataBase].nameFromClass = [self.nameArray objectAtIndex:(indexPath.row-1)];
        [YXFDataFromDataBase shareFromDataBase].IDFromClass = [self.IDArray objectAtIndex:(indexPath.row-1)];
        [YXFDataFromDataBase shareFromDataBase].ageFromClass = [self.ageArray objectAtIndex:(indexPath.row-1)];
        NSLog(@"datafromdatabase.nameFromClass==%@",[YXFDataFromDataBase shareFromDataBase].nameFromClass);
        //跳转到修改页面
        [self.navigationController pushViewController:addUser animated:YES];
    }
}

　　#import "YXFAddressViewCell.h"　　

#import <UIKit/UIKit.h>

@interface YXFAddressViewCell : UITableViewCell

@property (nonatomic, strong) UILabel *nameLabel;

@property (nonatomic, strong) UILabel *ageLabel;

@property (nonatomic, strong) UILabel *ID;

@end

 　　#import "YXFAddressViewCell.m"

#import "YXFAddressViewCell.h"

@implementation YXFAddressViewCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
        
        [self p_setupView];
    }
    return self;
}

- (void)p_setupView
{
    self.nameLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.contentView.frame) / 3, CGRectGetHeight(self.contentView.frame))];
    self.nameLabel.textAlignment = NSTextAlignmentCenter;
    [self.contentView addSubview:_nameLabel];
    
    self.ageLabel = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(self.nameLabel.frame), 0, CGRectGetWidth(self.contentView.frame) / 3, CGRectGetHeight(self.contentView.frame))];
    self.ageLabel.textAlignment = NSTextAlignmentCenter;
    [self.contentView addSubview:_ageLabel];
    
    self.ID = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(self.ageLabel.frame), 0, CGRectGetWidth(self.contentView.frame) / 3, CGRectGetHeight(self.contentView.frame))];
    self.ID.textAlignment = NSTextAlignmentCenter;
    [self.contentView addSubview:_ID];
    
}

　　现在运行是没有数据的 , 因为我们还没有添加数据,接下来,我们就来编写添加用户的代码

　　 

　　#import "YXFAddUserViewController.h" 

　　

#import <UIKit/UIKit.h>

@interface YXFAddUserViewController : UIViewController

{
    NSInteger operateType1;//保存操作类型，0是添加，1是修改
}
@property (nonatomic, strong) NSMutableArray *textFieldArray;

@property (nonatomic, strong) NSString *dbPath;

@property (nonatomic, strong) UITextField *nameTextField;

@property (nonatomic, strong) UITextField *ageTextField;

@property (nonatomic, strong) UITextField *IDTextField;

@property (nonatomic, assign) NSInteger operateType;

@end

 　　#import "YXFAddUserViewController.m"

#import "YXFAddUserViewController.h"

#import "YXFDataFromDataBase.h"
#import "FMDatabase.h"
#import "XFNotices.h"

@interface YXFAddUserViewController () <UITextFieldDelegate>

@end

@implementation YXFAddUserViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *path = [doc stringByAppendingPathComponent:@"user.sqlite"];
    NSLog(@"path===%@",path);
    self.dbPath = path;
    
    NSArray *array = [NSArray arrayWithObjects:@"姓名",@"年龄",@"ID", nil];
    for (int i = 0; i < 3 ; i++)
    {
        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake( 70,i * 40 + 134, 100, 30)];
        label.text = [array objectAtIndex:i];
        [self.view addSubview:label];
    }
    
    _nameTextField = [[UITextField alloc]initWithFrame:CGRectMake(150, 138, 100, 30)];
    _nameTextField.borderStyle = UITextBorderStyleRoundedRect;
    _nameTextField.placeholder = @"请输入姓名";
    _nameTextField.delegate = self;
    [self.view addSubview:_nameTextField];
    _ageTextField = [[UITextField alloc]initWithFrame:CGRectMake(150, 178, 100, 30)];
    _ageTextField.borderStyle = UITextBorderStyleRoundedRect;
    _ageTextField.placeholder = @"请输入年龄";
    _ageTextField.delegate = self;
    [self.view addSubview:_ageTextField];
    _IDTextField = [[UITextField alloc]initWithFrame:CGRectMake(150, 218, 100, 30)];
    _IDTextField.borderStyle = UITextBorderStyleRoundedRect;
    _IDTextField.placeholder = @"请输入ID";
    _IDTextField.delegate = self;
    [self.view addSubview:_IDTextField];
    if (_operateType == 1) {//operateType == 1时为修改
        
        _nameTextField.text = [YXFDataFromDataBase shareFromDataBase].nameFromClass;
        _IDTextField.text = [YXFDataFromDataBase shareFromDataBase].IDFromClass;
        _ageTextField.text = [YXFDataFromDataBase shareFromDataBase].ageFromClass;
        _IDTextField.enabled = NO;
        NSLog(@"datafromdatabase.nameFromClass=%@",[YXFDataFromDataBase shareFromDataBase].nameFromClass);
        
    }
    NSLog(@"operateType==%ld",operateType1);
    if (_operateType == 0){
        UIBarButtonItem *addBtn = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addNewUserInfo)];
        self.navigationItem.rightBarButtonItem = addBtn;
    }
    if(_operateType == 1){//这里是后来添加的，其实可以放到上面
        UIBarButtonItem *addBtn = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(addNewUserInfo)];
        self.navigationItem.rightBarButtonItem = addBtn;
        
    }
    
}

//添加详细信息
- (void)addNewUserInfo
{
    FMDatabase *db = [[FMDatabase alloc]initWithPath:self.dbPath];
    if ([db open]) {
        
        if (_nameTextField.text.length == 0||_ageTextField.text.length == 0||_IDTextField.text.length == 0){
            
            [XFNotices noticesWithTitle:@"请完成填写信息" Time:1.5 View:self.view Style:(XFNoticesStyleFail)];
        }else{
            NSLog(@"姓名==%@,年龄==%@,ID==%@",_nameTextField.text,_ageTextField.text,_IDTextField.text);
            NSString *sql= nil;
            if (self.operateType == 0){//执行插入操作
                sql = @"INSERT INTO USER (name,age,idcode) VALUES (?,?,?) ";
            }else if(_operateType == 1)//执行更新操作
            {
                sql = @"UPDATE USER  SET name = ? , age = ? where idcode = ?";
                
            }
            
            BOOL res = [db executeUpdate:sql,_nameTextField.text,_ageTextField.text,_IDTextField.text];
            if (!res) {
                [XFNotices noticesWithTitle:@"数据插入错误" Time:1.5 View:self.view Style:(XFNoticesStyleFail)];
            }else{
                [XFNotices noticesWithTitle:@"数据插入成功" Time:1.5 View:self.view Style:(XFNoticesStyleFail)];
            }
        }
    }else{
        NSLog(@"数据库打开失败") ;
    }
    if (operateType1 == 0)//如果是添加就留在该页，如果是修改就跳回上一页
    {
        [_nameTextField resignFirstResponder];
        [_ageTextField resignFirstResponder];
        [_IDTextField resignFirstResponder];
        _nameTextField.text = @"";
        _ageTextField.text = @"";
        _IDTextField.text = @"";
        [self.navigationController popViewControllerAnimated:YES];
    }
    [db close];
}

//让键盘隐藏
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [_nameTextField resignFirstResponder];
    [_ageTextField resignFirstResponder];
    [_IDTextField resignFirstResponder];
}


//页面将要消失的时候执行，将UITextField清空
-(void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:YES];
    _nameTextField.text = nil;
    _ageTextField.text = nil;
    _IDTextField.text = nil;
}

@end

　　 这个界面就这么多　　

　　我们继续创建我们的第三个界面 search 这个界面运用了 UISearchBar一开始我还是不怎么了解,想了超长时间,不过还是弄好了!!

　　#import "YXFSearchViewController.h"

　　

#import <UIKit/UIKit.h>

@interface YXFSearchViewController : UITableViewController

@property (nonatomic, strong) NSString *dbpath;
/*
 用于保存搜索出姓名的结果
 */
@property (nonatomic, strong) NSMutableArray *searchResults;
/*
 用来保存搜索的年龄信息
 */
@property (nonatomic, strong) NSMutableArray *searchAgeResults;
/*
 用来保存搜索的ID信息
 */
@property (nonatomic, strong) NSMutableArray *searchIDResult;
/*
 保存搜索之前的姓名信息
 */
@property (nonatomic, strong) NSMutableArray *nameArray;
/*
 保存搜索之前的年龄信息
 */
@property (nonatomic,strong) NSMutableArray *ageArray;

/*
 保存搜索之前的ID信息
 */
@property (nonatomic,strong) NSMutableArray *IDArray;
/*
 用来保存搜索的年龄信息
 */
@property (nonatomic,assign) BOOL searchWasActive;
/*
 这个好像没用了
 */
@property (nonatomic,assign) NSString *savedSearchTerm;

@property (nonatomic,retain) NSString *namestr;
@property (nonatomic,retain) NSString *agestr;
@property (nonatomic,retain) NSString *IDstr;

@end

　　#import "YXFSearchViewController.m"

#import "YXFSearchViewController.h"
#import "YXFAddUserViewController.h"
#import "YXFAddressViewController.h"
#import "FMDatabase.h"
#import "YXFDetailViewController.h"
@interface YXFSearchViewController () <UISearchBarDelegate,UISearchControllerDelegate>

@property (nonatomic, strong) UISearchDisplayController *searchController;

@end

@implementation YXFSearchViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];
    
    //搜索比较复杂，既要初始化UISearchBar，又要初始化UISearchDisplayController，然后还要写UITableViewDelegate里的-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath和-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section方法，还要设置一大堆代理，慢慢往下看
    UISearchBar *search = [[UISearchBar alloc]initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width -50, 44)];
    search.placeholder = @"请输入姓名";
    search.autocorrectionType = UITextAutocorrectionTypeNo;//不自动纠错，貌似没啥用
    search.autocapitalizationType = UITextAutocapitalizationTypeAllCharacters;//所有字母大写 ，也没啥用
    
    search.showsScopeBar = YES;
    search.delegate = self;//UISearchBar设置代理
    search.keyboardType = UIKeyboardTypeNamePhonePad;
    self.tableView.tableHeaderView = search;
    self.tableView.dataSource = self;
    
    _searchController = [[UISearchDisplayController alloc]initWithSearchBar:search contentsController:self];
    _searchController.active = NO;
    
    _searchController.delegate = self;//UISearchDisplayController设置代理
    
    _searchController.searchResultsDelegate=self;//还是代理
    
    _searchController.searchResultsDataSource = self;//有完没完
    NSString *document = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
    NSString *path = [document stringByAppendingPathComponent:@"user.sqlite"];
    NSLog(@"path==%@",path);
    self.dbpath = path;
    self.tableView.delegate = self;//tableView的代理，为什么这么写，因为这个类是继承UITableView的，要注意！不是继承UIViewController的！
    self.tableView.dataSource = self;
    _nameArray = [[NSMutableArray alloc]initWithCapacity:0];
    _ageArray = [[NSMutableArray alloc]initWithCapacity:0];
    _IDArray= [[NSMutableArray alloc]initWithCapacity:0];
    
    [self getAllDatabase];
    [self.tableView reloadData];
    
}

- (void)viewWillAppear:(BOOL)animated
{
    [self.tableView reloadData];
}

- (void)getAllDatabase
{
    FMDatabase *db = [FMDatabase databaseWithPath:self.dbpath];
    if ([db open]) {
        NSString *sql = @"SELECT * FROM USER";
        FMResultSet *rs = [db executeQuery:sql];
        while ([rs next]) {
            NSString *name = [rs stringForColumn:@"name"];
            NSString *age = [rs stringForColumn:@"age"];
            NSString *ID = [rs stringForColumn:@"idcode"];
            
            [self.nameArray addObject:name];
            [self.ageArray addObject:age];
            [self.IDArray addObject:ID];
        }
        self.searchResults = [[NSMutableArray alloc]initWithArray:_nameArray copyItems:YES];
        self.searchAgeResults = [[NSMutableArray alloc]initWithArray:_ageArray copyItems:YES];
        self.searchIDResult = [[NSMutableArray alloc]initWithArray:_IDArray copyItems:YES];
        NSLog(@"search from nameArray==%@",self.nameArray);
        [db close];
    }
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    NSInteger row = 0;
    if ([tableView isEqual:self.searchDisplayController.searchResultsTableView]) {//记住这个格式，如果当前的table就是用于显示所搜信息的table的话。因为UISearchDisplayController这货自带一个table
        row = [self.searchResults count];
    }else{
        [self.nameArray count];
    }
    return row;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    static NSString *cellIdentifier = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    if ([tableView isEqual:self.searchDisplayController.searchResultsTableView]) {
        cell.textLabel.text = [_searchResults objectAtIndex:indexPath.row];
        //        cell.detailTextLabel.text = [NSString stringWithFormat:@"电话：%@",[searchResults objectAtIndex:indexPath.row]];//不知道为什么不显示cell.detailTextLabel.text ，有人知道的话告诉我一下
    }else{
        cell.textLabel.text = [self.nameArray objectAtIndex:indexPath.row];
    }
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    YXFDetailViewController *detailInfo = [[YXFDetailViewController alloc]init];
    detailInfo.nameStr = [self.searchResults objectAtIndex:indexPath.row];
    detailInfo.ageStr = [self.searchAgeResults objectAtIndex:indexPath.row];
    detailInfo.IDsStr = [self.searchIDResult objectAtIndex:indexPath.row];
    NSLog(@"self.namestr==%@",self.namestr);
    
    NSArray *array = [self.navigationController viewControllers];//先获取视图控制器数组
    UINavigationController *nav = [array objectAtIndex:[array count] - 1];//获取当前的导航试图控制器
    [nav.navigationController pushViewController:detailInfo animated:YES];//跳转到删除页面
}


#pragma mark -UISearchControllerDisplay-//设置搜索范围
//下面注意了，下面的方法是实现搜索功能的，后面两个长得很像的方法是UISearchControllerDisplay代理里的方法，我也搞不懂是干什么用的，他们的格式很固定，大家记住就行了。

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    [self searchBarSearchButtonClicked:self.searchDisplayController.searchBar];
    
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar//从数据库搜索
{
    FMDatabase *db = [FMDatabase databaseWithPath:self.dbpath];
    if ([db open]) {
        
        [_searchResults removeAllObjects];
        [_searchAgeResults removeAllObjects];
        [_searchIDResult removeAllObjects];
        NSString *sql = @"SELECT * FROM USER WHERE name like ?";
        FMResultSet *rs = [db executeQuery:sql,searchBar.text];
        while ([rs next]) {
            self.namestr = [rs stringForColumn:@"name"];
            self.agestr = [rs stringForColumn:@"age"];
            self.IDstr = [rs stringForColumn:@"idcode"];
            
            [self.searchResults addObject:_namestr];
            [self.searchAgeResults addObject:_agestr];
            [self.searchIDResult addObject:_IDstr];
        }
        
        NSLog(@"searchResults == %@",_searchResults);
        NSLog(@"searchAgeResults==%@",_searchAgeResults);
        NSLog(@"searchIDResult==%@",_searchIDResult);
        NSLog(@"search===%@",searchBar.text);
        
    }
    [db close];
    
}

#pragma mark -
#pragma mark UISearchDisplayController Delegate Methods设置代理方法

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    [self filterContentForSearchText:searchString scope:
     [[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];

    return YES;
}


- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption
{
    [self filterContentForSearchText:[self.searchDisplayController.searchBar text] scope:
     [[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];
    
    return YES;
}

@end

　　在搜索框里面查到我们数据,我们可以点击进入详细界面,那么,我们就来创建详细界面吧,数据库的删除就在这里面实现了!

　　#import "YXFDetailViewController.h"

#import <UIKit/UIKit.h>

@interface YXFDetailViewController : UIViewController

@property(nonatomic, strong) NSString *dbpath;

@property(nonatomic, strong) NSString *nameStr;

@property(nonatomic, strong) NSString *ageStr;

@property(nonatomic, strong) NSString *IDsStr;

@end

　　#import "YXFDetailViewController.m"

#import "YXFDetailViewController.h"

#import "FMDatabase.h"
#import "XFNotices.h"

@interface YXFDetailViewController ()

@end

@implementation YXFDetailViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    self.title = @"详细信息";
    NSArray *array = [NSArray arrayWithObjects:@"姓名:",@"年龄:",@"ID:", nil];
    NSArray *array2 = [NSArray arrayWithObjects:self.nameStr,self.ageStr,self.IDsStr, nil];
    
    for (int i = 0; i < 3 ; i++)
    {
        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake( 70,i * 40 + 134, 100, 30)];
        label.text = [array objectAtIndex:i];
        [self.view addSubview:label];
        
        UILabel *label2 = [[UILabel alloc]initWithFrame:CGRectMake(140, i * 40 +135, 100, 30)];
        label2.text = [array2 objectAtIndex:i];
        [self.view addSubview:label2];
    }
    NSString *document = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
    NSString *path = [document stringByAppendingPathComponent:@"USER.sqlite"];
    self.dbpath = path;
    
    UIBarButtonItem *deleteButton = [[UIBarButtonItem alloc]initWithTitle:@"删除" style:UIBarButtonItemStyleDone target:self action:@selector(deleteFromDatabase)];
    self.navigationItem.rightBarButtonItem = deleteButton;
    
}

- (void)deleteFromDatabase//从数据库删除信息
{
    FMDatabase *db = [FMDatabase databaseWithPath:self.dbpath];
    if ([db open]) {
        NSString *sql = @"DELETE FROM USER WHERE name = ? and age = ? and idcode = ?";
        if (self.nameStr.length != 0&&self.ageStr.length != 0&&self.IDsStr.length !=0){
            BOOL rs = [db executeUpdate:sql,self.nameStr,self.ageStr,self.IDsStr]; //后面跟的三个参数就是sql语句里的三个问号对应
            if (rs) {
                [XFNotices noticesWithTitle:@"删除成功" Time:1 View:self.view Style:(XFNoticesStyleSuccess)];
                [self.navigationController popViewControllerAnimated:YES];
            }else{
                [XFNotices noticesWithTitle:@"删除失败" Time:1 View:self.view Style:(XFNoticesStyleFail)];
            }
        }
    }
    [db close];
}


@end

　　好了 都完成了,接下来 运行编译 看看效果吧 

　　上面,我已经贴上demo 的地址了,但是还是希望刚刚接触的朋友自己写一遍,要是碰到什么 bug 希望能告诉我,我及时更正错误!