主要是用sqlite3来存储聊天记录
先导入sqlite3.dylib, 点 Add Other, 同时按住 shift + command + G , 在弹出的 Go to the folder 中输入 /usr/lib/libsqlite3.dylib, 就 OK 了. 还需要#import<sqlite3.h>
1.new file 一个 Text 类用来存储, .m 无需操作
1 #import <Foundation/Foundation.h>
2
3 @interface Text : NSObject
4 //聊天内容
5 @property(nonatomic,copy)NSString *userText;
6 //聊天内容发送的时间
7 @property(nonatomic,copy)NSString *currentTime;
8 @end
2.另封装一个 TextModel 类用来操作数据
1 #import <Foundation/Foundation.h>
2 #import <sqlite3.h>
3 @class Text;
4 @interface TextModel : NSObject
5 //建表
6 -(BOOL)createList:(sqlite3 *)db;
7 //插入
8 -(BOOL)insertList:(Text *)insertList;
9 //获取数据
10 -(NSMutableArray *)getList;
11 @end
.m
//
// TextModel.m
// 保存聊天记录
//
// Copyright © 2016年 736376103@qq.com. All rights reserved.
//
#import "TextModel.h"
#import "Text.h"
@implementation TextModel
//定义一个变量
static sqlite3 *_database;
-(NSString *)filename{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
//这里打印,是方便用MesaSQLite打开sqlite3文件,可以增删改查,非常方便,主要是免费(有时间限制)~~~
NSLog(@"%@",path);
return [path stringByAppendingPathComponent:@"LIKE.sqlite"];
}
-(BOOL)openDB{
//获取路径
NSString *path = [self filename];
NSFileManager *fileManager = [NSFileManager defaultManager];
//判断数据库是否存在
BOOL find = [fileManager fileExistsAtPath:path];
//如果为真,就打开数据库,不存在,自动创建
if (find) {
NSLog(@"database存在");
if (sqlite3_open([path UTF8String], &_database)!=SQLITE_OK) {
//failed关闭,据说这个习惯好,不明觉厉
sqlite3_close(_database);
NSLog(@"打开database失败");
return NO;
}
//建表
[self createList:_database];
return YES;
}
//同上
if (sqlite3_open(path.UTF8String, &_database) == SQLITE_OK) {
[self createList:_database];
return YES;
}else{
sqlite3_close(_database);
NSLog(@"打开database失败");
return NO;
}
return NO;
}
#pragma mark -- 建表
-(BOOL)createList:(sqlite3 *)db{
//我这里缺少一个主键,自己加上即可--ID INTEGER PRIMARY KEY AUTOINCREMENT
NSString *sql = [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS DRINK(userText TEXT,currentTime TEXT)"];
sqlite3_stmt *stmt;
//sqlite3_prepare_v2 接口把一条SQL语句解析到statement结构里去. 使用该接口访问数据库是当前比较好的的一种方法
NSInteger sqlReturn = sqlite3_prepare_v2(_database, sql.UTF8String, -1, &stmt, NULL);
//-1是sql语句的长度,<0会自动计算
if (sqlReturn != SQLITE_OK) {
NSLog(@"创建表失败");
return NO;
}
int success = sqlite3_step(stmt);
//释放stmt
sqlite3_finalize(stmt);
if (success != SQLITE_DONE) {
NSLog(@"创建表失败");
return NO;
}
NSLog(@"创建表成功");
return YES;
}
#pragma mark -- 插入
-(BOOL)insertList:(Text *)insertList{
if ([self openDB])
{
sqlite3_stmt *stmt;
// ? 表示待会儿插入
NSString *sql = [NSString stringWithFormat:@"INSERT INTO DRINK(userText,currentTime)VALUES(?,?)"];
//int success = sqlite3_exec(_database, sql.UTF8String, NULL, NULL, &error);
int success = sqlite3_prepare_v2(_database, sql.UTF8String, -1, &stmt, NULL);
if (success != SQLITE_OK) {
NSLog(@"insert failed");
sqlite3_close(_database);
return NO;
}
sqlite3_bind_text(stmt, 1, [insertList.userText UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 2, [insertList.currentTime UTF8String], -1, SQLITE_TRANSIENT);
//执行插入语句
success = sqlite3_step(stmt);
//释放stmt
sqlite3_finalize(stmt);
NSLog(@"%@",insertList.userText);
NSLog(@"%@",insertList.currentTime);
//如果failed
if (success == SQLITE_ERROR) {
NSLog(@"failed insert into database");
sqlite3_close(_database);
return NO;
}
sqlite3_close(_database);
return YES;
}
return NO;
}
#pragma mark -- 获取
-(NSMutableArray *)getList{
NSMutableArray *array = nil;
//判断是否打开,这里可以用 dispatch_once 只执行一次
if ([self openDB]) {
sqlite3_stmt *stmt;
NSString *sql = [NSString stringWithFormat:@"SELECT userText,currentTime FROM DRINK"];
if (sqlite3_prepare_v2(_database, sql.UTF8String, -1, &stmt, NULL) != SQLITE_OK) {
NSLog(@"failed to get list");
}else{
array = [NSMutableArray array];
//遍历记录,这里是从0开始,别写错了
while (sqlite3_step(stmt) == SQLITE_ROW) {
Text *p = [[Text alloc]init];
char *strText = (char *)sqlite3_column_text(stmt, 0);
//做个判断,如果记录为nil,不执行,这里自己要想一下,为什么要判断
if (strText != NULL) {
p.userText = [NSString stringWithUTF8String:strText];
}
char *strTime = (char *)sqlite3_column_text(stmt, 1);
//时间为Null,不执行
if (strTime != NULL) {
p.currentTime = [NSString stringWithUTF8String:strTime];
}
//加进可变数组
[array addObject:p];
}
}
//释放stmt
sqlite3_finalize(stmt);
sqlite3_close(_database);
}
return array;
}
@end
3.ViewController.h, 在 storyboard 拖一个 tableView 和一个 textField
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
@property (weak, nonatomic) IBOutlet UITableView *tableview;
@property (weak, nonatomic) IBOutlet UITextField *textField;
@end
.m
//
// ViewController.m
// 保存聊天记录
//
// Created by 736376103@qq.com on 16/4/4.
// Copyright © 2016年 736376103@qq.com. All rights reserved.
//
#import "ViewController.h"
#import "TableViewCell.h"
#import "Text.h"
#import "TextModel.h"
//实现 UITablevView 和 UITextField 的代理
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate,UITextFieldDelegate>
//数据源
@property(nonatomic,strong)NSMutableArray *dataSource;
//处理数据的类
@property(nonatomic,strong)TextModel *textModel;
@end
@implementation ViewController
//加载数据
-(void)reloadDataSource{
if (_textModel == nil) {
_textModel = [[TextModel alloc]init];
}
//获取数据
_dataSource = [_textModel getList];
}
- (void)viewDidLoad {
[super viewDidLoad];
//设置代理
_textField.delegate = self;
//调用加载数据方法
[self reloadDataSource];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
-(void)sendMessageContent:(NSString *)text {
//获取时间
NSDate *date = [NSDate date];
NSDateFormatter *dateForMatter = [[NSDateFormatter alloc]init];
//hh:mm 是 09:54 这样的格式,可以自由发挥
dateForMatter.dateFormat = @"hh:mm";
NSString *timeString = [dateForMatter stringFromDate:date];
Text *t = [[Text alloc]init];
//把时间存到 Text 的属性
t.currentTime = timeString;
//输入的内容
t.userText = text;
//插入到数据库
[_textModel insertList:t];
}
#pragma mark -- UITextField代理
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
//自定义方法,把输入的内容存到 Text
[self sendMessageContent:textField.text];
//取消第一响应
[textField resignFirstResponder];
//清空键盘
textField.text = @"";
//插入之后,加载一次数据,相当于往数据源里加数据
[self reloadDataSource];
//刷新界面,显示刚插入的数据
[_tableview reloadData];
return YES;
}
#pragma mark - TableView 数据源
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return _dataSource.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
Text *p = _dataSource[indexPath.row];
//自定义 cell
TableViewCell *cell = [TableViewCell tableView:tableView];
//cell 不可点击
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.timeLabel.text = p.currentTime;
cell.OtherLabel.text = p.userText;
return cell;
}
#pragma mark - 代理方法
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
return 80;
}
@end
4.自定义 cell
#import <UIKit/UIKit.h>
@interface TableViewCell : UITableViewCell
//聊天内容
@property (strong, nonatomic)UILabel *OtherLabel;
//时间
@property (strong, nonatomic)UILabel *timeLabel;
//头像,这个自己随便找个图
@property(strong,nonatomic)UIImageView *meImageView;
+(instancetype)tableView:(UITableView *)tableView;
@end
.m
//
// TableViewCell.m
// 保存聊天记录
//
// Created by 736376103@qq.com on 16/4/4.
// Copyright © 2016年 736376103@qq.com. All rights reserved.
//
#import "TableViewCell.h"
@implementation TableViewCell
//初始化的时候,创建控件
-(id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{
if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
CGFloat width = [UIScreen mainScreen].bounds.size.width;
_OtherLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 40, width-40, 30)];
_OtherLabel.font = [UIFont systemFontOfSize:16];
_OtherLabel.numberOfLines = 0;
_OtherLabel.lineBreakMode = NSLineBreakByTruncatingTail;
_OtherLabel.textAlignment = NSTextAlignmentRight;
[self.contentView addSubview:_OtherLabel];
_timeLabel = [[UILabel alloc]initWithFrame:CGRectMake(width/2-20, 0, 40, 20)];
_timeLabel.font = [UIFont systemFontOfSize:12];
[self.contentView addSubview:_timeLabel];
_meImageView = [[UIImageView alloc]initWithFrame:CGRectMake(width-40, 10, 30, 30)];
_meImageView.image = [UIImage imageNamed:@"003"];
[self.contentView addSubview:_meImageView];
}
return self;
}
+(instancetype)tableView:(UITableView *)tableView{
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ChatTableViewCell"];
//cell 复用
if (cell == nil) {
cell = [[TableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"ChatTableViewCell"];
}
return cell;
}
@end