iOS中的 沙盒文件夹 (数据的写入和读取,归档和反归档)

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    /**    沙盒中文件夹:     1.Documents : 存储长久保存的数据     2.library:        Caches:存放的缓存,比如:视频,音频,图片,小说等等        Perferences:存储偏好设置,比如:应用程序是否是第一次启动        保存用户名和密码.     3.tmp:存储临时文件,比如:下载的zip包,解压后直接删除.     */       //1.获取沙盒文件路径    NSString *homePath= NSHomeDirectory();    NSLog(@"%@",homePath);        //NSUserDefaults 直接操作 Preferences 文件夹    /*    NSUserDefaults *userdefaults = [NSUserDefaults standardUserDefaults];    [userdefaults setBool:YES forKey:@"FirstLanch"];    [userdefaults setObject:@"Leo" forKey:@"userName"];    [userdefaults setObject:@"lanoulanou" forKey:@"password"];    [userdefaults synchronize]; //立即同步    */    //1.需求:判断用户之前是否已经登录,如果登录则提示登录成功,否则提示输入用户名和密码,存储到本地    //NSUserDefaults *userdefaults = [NSUserDefaults standardUserDefaults];//    if (![userdefaults objectForKey:@"account"] || ![userdefaults objectForKey:@"password"]) {//        //无效状体,此时需要提醒用户,输入用户名和密码//        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"你之前没有登录" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"登录", nil];//        //设置警示框样式//        alertView.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;//        [alertView show];//        [alertView release];//    }else{//        //有效登录状体,提示用户,登录成功//        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"你已经登录" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles:nil];//        [alert show];//        [alert release];//    }    //2.应用程序包得路径    NSString *bundlePath = [[NSBundle mainBundle] bundlePath];    NSLog(@"%@",bundlePath);    return YES;}//点击警示框的按钮触发的方法- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    switch (buttonIndex) {        case 1:        {        //获取警示框上得的输入框中的内容            NSString *accout = [alertView textFieldAtIndex:0].text;            NSString *password = [alertView textFieldAtIndex:1].text;            //持久化处理            NSUserDefaults *user = [NSUserDefaults standardUserDefaults];            //将用户名密码存储到沙盒中 Preferences 文件夹下            [user setObject:accout forKey:@"account"];            [user setObject:password forKey:@"password"];            [user synchronize];        }            break;                    default:            break;    }}

RootViewController.m

#import "RootViewController.h"@interface RootViewController ()@property (retain, nonatomic) IBOutlet UITextField *nameTextField;@property (retain, nonatomic) IBOutlet UITextField *pswTextField;@end@implementation RootViewController/** *文件读取支持的类型:(字符串,数组,字典,二进制数据 -- NSData) 1.写入文件. writeToFile:atomically:--针对于 数组,字典,二进制数据  writeToFile:atomically:encoding:error: --针对于字符串  2.从文件中读取数据 [类名 类名WithContentsOfFile:(文件路径)]; --- 针对于数组,字典,二进制数据 [类名 类名WithContentsOfFile:encoding:error:]; --- 针对字符串  3.VVVIP 对于数组,字典大容器来说,想要实现文件读写,必须保证容器中的元素也必须是字符串,数组,字典,二进制数据类型之一.   */- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}- (IBAction)writeBtn:(id)sender {//    //1.字符串写入文件//    NSError *error = nil;//    //先读取源文件中的内容//    NSString *oldStr = [NSString stringWithContentsOfFile:[self filePath] encoding:NSUTF8StringEncoding error:nil];//    //将原有数据与新数据拼接一起//    //    //    //    NSString *newStr = [oldStr stringByAppendingFormat:@"%@",self.nameTextField.text];//    if (!newStr) {//        newStr = self.nameTextField.text;//    }//   BOOL isSuccess = [newStr writeToFile:[self filePath] atomically:YES encoding:NSUTF8StringEncoding error:&error];//    if (isSuccess) {//        NSLog(@"写入成功");//    }else{//        NSLog(@"写入失败");//    }    //2.数组写入文件//    NSArray *dataArr = @[self.nameTextField.text, self.pswTextField.text];//    //    //    //    BOOL isSuccess = [dataArr writeToFile:[self filePath] atomically:YES];        //2.字典写入文件    NSDictionary *dic = @{@"tf1":self.nameTextField.text,@"tf2":self.pswTextField.text};    [dic writeToFile:[self filePath] atomically:YES];           }- (IBAction)readBtn:(id)sender {//    //1.字符串从文件中读取//   NSString *text = [NSString stringWithContentsOfFile:[self filePath] encoding:NSUTF8StringEncoding error:nil];//    //2.让第二个输入框显示//    self.pswTextField.text = text;            //    NSArray *dataArr = [NSArray arrayWithContentsOfFile:[self filePath]];//    //第一个输入框显示第二个输入框的内容,第二个输入框显示第一个输入框的内容//    self.nameTextField.text = [dataArr lastObject];//    self.pswTextField.text = dataArr[0];                 //3.字典从文件中读取数据    NSDictionary *dic = [NSDictionary dictionaryWithContentsOfFile:[self filePath]];    self.nameTextField.text = [dic objectForKey:@"tf2"];    self.pswTextField.text = [dic objectForKey:@"tf1"];}//获取文件路径- (NSString *)filePath{    //1.获取Document(存放持久保存的数据)文件夹路径    //参数1:查找的文件路径    //参数2:在那个域中查找    //参数3:是否显示详细路径   NSString *doucumentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];    //2.拼接上文件路径    NSString *filtPath = [doucumentsPath stringByAppendingPathComponent:@"Leo.txt"];    NSLog(@"%@",filtPath);    return filtPath;}- (void)dealloc {    [_nameTextField release];    [_pswTextField release];    [super dealloc];}@end

SecondViewController.m

#import "SecondViewController.h"#import "Contact.h"@interface SecondViewController ()@property (retain, nonatomic) IBOutlet UITextField *secondNameTFd;@property (retain, nonatomic) IBOutlet UITextField *secondPwdTFd;@end@implementation SecondViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}//归档按钮- (IBAction)archiveFile:(id)sender {    Contact *contact = [[Contact alloc] initWithName:self.secondNameTFd.text gender:self.secondPwdTFd.text age:19 phoneNumber:@"332" motto:@"不成功便成仁"];    //1.创建归档工具对象    NSMutableData *mData =[NSMutableData data];    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:mData];    //2.开始归档    [archiver encodeObject:contact forKey:@"Leo"];    //3.结束归档    [archiver finishEncoding];        //4.内存释放    [contact release];    [archiver release];    //data写入文件    BOOL isSuccess = [mData writeToFile:[self getFilePath] atomically:YES];}//反归档- (IBAction)noArchiveFile:(id)sender {    //1.Data从本地读取数据    NSData *data = [NSData dataWithContentsOfFile:[self getFilePath]];    //2.创建反归档工具    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];    //3.开始反归档   Contact *contact = [unarchiver decodeObjectForKey:@"Leo"];    //4.结束反归档    [unarchiver finishDecoding];    //释放    [unarchiver release];        //5.读取数据    self.secondNameTFd.text = contact.phoneNumber;    self.secondPwdTFd.text = contact.name;}//获取文件路径的方法- (NSString *)getFilePath{    //1.获取 Documents 文件夹路径    NSString *doucumentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];    //2.拼接上存储文件的路径    NSString *filePath = [doucumentsPath stringByAppendingPathComponent:@"Leo.data"];    NSLog(@"%@",filePath);    return filePath;}- (void)dealloc {    [_secondNameTFd release];    [_secondPwdTFd release];    [super dealloc];}@end

Contact.h#import <Foundation/Foundation.h>@interface Contact : NSObject<NSCoding>@property (nonatomic, copy) NSString *name;@property (nonatomic, copy) NSString *gender;@property (nonatomic, assign) NSInteger age;@property (nonatomic, copy) NSString *motto;@property (nonatomic, copy) NSString *phoneNumber;- (instancetype)initWithName:(NSString *)name gender:(NSString *)gender age:(NSInteger)age phoneNumber:(NSString *)phoneNumber motto:(NSString *)motto;@endContact.m#import "Contact.h"@implementation Contact- (instancetype)initWithName:(NSString *)name gender:(NSString *)gender age:(NSInteger)age phoneNumber:(NSString *)phoneNumber motto:(NSString *)motto{    if (self = [super init]) {        self.name = name;        self.gender = gender;        self.age = age;        self.phoneNumber = phoneNumber;        self.motto = motto;    }    return self;}/** *  当一个对象进行归档是,自动调用该方法,为该对象的实例变量进行归档操作. * *  @param aCoder <#aCoder description#> */- (void)encodeWithCoder:(NSCoder *)aCoder{    //内部,要对每一个实例变量进行归档操作    [aCoder encodeObject:_name forKey:@"name"];    [aCoder encodeObject:_gender forKey:@"gender"];    [aCoder encodeObject:@(_age) forKey:@"age"];    [aCoder encodeObject:_motto forKey:@"motto"];    [aCoder encodeObject:_phoneNumber forKey:@"phoneNumber"];}//当对一个对象进行反归档操作时,自动调用该方法,为该方法的实例变量进行反归档操作- (id)initWithCoder:(NSCoder *)aDecoder{    if (self = [super init]) {        self.name = [aDecoder decodeObjectForKey:@"name"];        self.gender = [aDecoder decodeObjectForKey:@"gender"];        self.age = [[aDecoder decodeObjectForKey:@"age"] integerValue];        self.motto = [aDecoder decodeObjectForKey:@"motto"];        self.phoneNumber = [aDecoder decodeObjectForKey:@"phoneNumber"];    }    return self;}-(void)dealloc{    self.name = nil;    self.gender = nil;    self.phoneNumber = nil;    self.motto = nil;    [super dealloc];}@end