"plist文件存储"1.字符串 数组 字典 可以直接存储数据在一个文件2.掌握沙盒备目录的作用以及目录路径获取方式// Document [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]// 缓存 [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];// 临时 NSTemporaryDirectory();// 主目录  NSHomeDirectory();3.不是所有对象都可以保存到plist文件中，要有实现writeFile方法才可以4.学会使用SimPholders2打开沙盒目录

@interface HJPlistController ()@property (weak, nonatomic) IBOutlet UILabel *textView;@property (strong,nonatomic) NSString *docPath;- (IBAction)stringWrite:(id)sender;- (IBAction)stringRead:(id)sender;- (IBAction)arrayWrite:(id)sender;- (IBAction)arrayRead:(id)sender;- (IBAction)dictionoryWrite:(id)sender;- (IBAction)dictionaryRead:(id)sender;@end/** *  使用xml plist属性列表归档 ,preference偏好设置,使用NSKeyedArchiver归档(NSCoding) */@implementation HJPlistController- (NSString *)docPath{    // 获取 "沙盒"document目录    if (_docPath == nil) {        _docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];        _docPath = [_docPath stringByAppendingPathComponent:@"data.plist"];    }    return _docPath;}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    // Do any additional setup after loading the view, typically from a nib.        //查看沙盒的路径    //1.控制台打印沙盒的路径,使用finder-前往-文件夹 打开    //2.控制台打印沙盒的路径,打开终端 open + 路径    //3.使用simpholders工具    //4.可以断点 输入po NSHomeDirectory()        //获取缓存路径(cache)//    NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];//    NSLog(@"%@",cachePath);//    //    //    //获取临时路径(tmp)//    NSString *tmpPath = NSTemporaryDirectory();//    NSLog(@"%@",tmpPath);//    //    //主目录//    NSString *homePath = NSHomeDirectory();//    NSLog(@"%@",homePath);    }- (IBAction)stringWrite:(id)sender {    NSLog(@"%@",self.docPath);    NSString *data = http://www.mamicode.com/@"ios中国";    [data writeToFile:self.docPath atomically:YES encoding:NSUTF8StringEncoding error:nil];}- (IBAction)stringRead:(id)sender {    NSString *resultStr = [NSString stringWithContentsOfFile:self.docPath encoding:NSUTF8StringEncoding error:nil];    self.textView.text = resultStr;}- (IBAction)arrayWrite:(id)sender{    NSArray *dataArray = [NSArray arrayWithObjects:@"a",@"b",@"c",@"中",@"国", nil];    [dataArray writeToFile:self.docPath atomically:YES];}- (IBAction)arrayRead:(id)sender{    NSArray *resultData = http://www.mamicode.com/[NSArray arrayWithContentsOfFile:self.docPath];"\n"];    }        self.textView.text = ms;}- (IBAction)dictionoryWrite:(id)sender{    NSDictionary *dict = @{@"a":@"1",@"2":@"2",@"zh":@"中国"};    [dict writeToFile:self.docPath atomically:YES];}- (IBAction)dictionaryRead:(id)sender{    NSDictionary *resultData = http://www.mamicode.com/[NSDictionary dictionaryWithContentsOfFile:self.docPath];"%@:%@",key,resultData[key]];        [ms appendString:@"\n"];    }        self.textView.text = ms;}@end

"用户偏好设置"1.ios中有个NSUserDefaults对象有可保存数据，我们称为用户偏好设置2.通过[NSUserDefaults standardUserDefaults]可以获取用户偏好设置对象，保存字符串 布尔值 int等数据3.保存数据时，一定要调用synchronize，因为数据要及时保存到沙盒的文件中/*  NSUserDefaults *defualts = [NSUserDefaults standardUserDefaults];    [defualts setObject:@"zhangsan" forKey:@"username"];  [defualts setObject:@"123" forKey:@"password"];  [defualts setBool:YES forKey:@"autoLogin"];  [defualts setBool:YES forKey:@"rememberPwd"];    //同步  [defualts synchronize];*/

4.掌握用户偏好设置数据的获取，更改，删除

@interface HJPreferenceController ()@property (weak, nonatomic) IBOutlet UITextField *pwdTextField;@property (weak, nonatomic) IBOutlet UISwitch *rememberSwith;@property (weak, nonatomic) IBOutlet UILabel *dataLabel;- (IBAction)saveBut:(id)sender;- (IBAction)readBut:(id)sender;- (IBAction)updateBut:(id)sender;- (IBAction)deleteBut:(id)sender;@end@implementation HJPreferenceController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {    // Get the new view controller using [segue destinationViewController].    // Pass the selected object to the new view controller.}*/- (IBAction)saveBut:(id)sender {    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];    [userDefault setObject:self.pwdTextField.text forKey:@"pwd"];    [userDefault setBool:self.rememberSwith.isOn forKey:@"isRememberPwd"];        // 同步数据    [userDefault synchronize];}- (IBAction)readBut:(id)sender {     NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];    self.dataLabel.text = [NSString stringWithFormat:@"%@:%@ %@:%d",@"pwd",[userDefault objectForKey:@"pwd"],@"isRememberPwd",[userDefault boolForKey:@"isRememberPwd"]];}// 修改偏好设置就是把键值重写设置 这样会覆盖原有的键值- (IBAction)updateBut:(id)sender {    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];    [userDefault setObject:self.pwdTextField.text forKey:@"pwd"];    [userDefault setBool:self.rememberSwith.isOn forKey:@"isRememberPwd"];        [userDefault synchronize];        self.dataLabel.text = [NSString stringWithFormat:@"%@:%@ %@:%d",@"pwd",[userDefault objectForKey:@"pwd"],@"isRememberPwd",[userDefault boolForKey:@"isRememberPwd"]];        }- (IBAction)deleteBut:(id)sender {    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];        [userDefault removeObjectForKey:@"isRememberPwd"];        [userDefault synchronize];        self.dataLabel.text = [NSString stringWithFormat:@"%@:%@ %@:%d",@"pwd",[userDefault objectForKey:@"pwd"],@"isRememberPwd",[userDefault boolForKey:@"isRememberPwd"]];}@end

"NSKeyedArchiver归档"/*什么叫归档 归档就是把数据保存到一个文件中*/1.使用NSKeyedArchiver可以将NSArray NSDictiony NSString等对象归档到一个文件2.只有实现了NSCoding协议的对象才可使用NSKeyedArchiver进行归档3.将模型对象保存到一个文件时，对象要遵守NSCoding协议，并实现NSKeyedArchiver的encodeWithCoder方法,4.从归档文件里读取对象时要实现NSCoding的initWithCoder方法5.ios中，控制器，控件都继承NSCoding,storyboard/xib都是使用NSKeyedArchiver进行归档的

#import <Foundation/Foundation.h>@interface HJPerson : NSObject<NSCoding>@property (nonatomic,copy) NSString *name;@property (nonatomic,assign) int age;@property (nonatomic,strong) NSDate *birthday;@end

#import "HJPerson.h"@implementation HJPerson- (void)encodeWithCoder:(NSCoder *)aCoder{    [aCoder encodeObject:self.name forKey:@"name"];    [aCoder encodeInt:self.age forKey:@"age"];    [aCoder encodeObject:self.birthday forKey:@"birthday"];}- (id)initWithCoder:(NSCoder *)aDecoder{    if (self == [super init]) {        self.name = [aDecoder decodeObjectForKey:@"name"];        self.age = [aDecoder decodeIntForKey:@"age"];        self.birthday = [aDecoder decodeObjectForKey:@"birthday"];    }    return self;}@end

#import "HJPerson.h"#warning 父类遵循了NSCoding方法就可以再此不遵循@interface HJStudent : HJPerson@property (nonatomic,strong) NSString *no;@end

#import "HJStudent.h"@implementation HJStudent- (void)encodeWithCoder:(NSCoder *)aCoder{#warning 记得在此调用父类的方法进行初始化    [super encodeWithCoder:aCoder];    [aCoder encodeObject:self.no forKey:@"no"];}- (id)initWithCoder:(NSCoder *)aDecoder{#warning 记得在此调用父类的方法进行初始化    if (self == [super initWithCoder:aDecoder]) {#warning 记得一定在此给属性赋值操作        self.no = [aDecoder decodeObjectForKey:@"no"];    }    return self;}- (NSString *)description{    return [NSString stringWithFormat:@"%@,%d,%@,%@",self.name,self.age,self.birthday,self.no];}@end

////  HJCodingController.m//  数据存储////  Created by HJiang on 14/12/30.//  Copyright (c) 2014年 HJiang. All rights reserved.//#import "HJCodingController.h"#import "HJStudent.h"@interface HJCodingController ()@property (strong,nonatomic) NSString *docPath;@property (weak, nonatomic) IBOutlet UITextField *nameTextField;@property (weak, nonatomic) IBOutlet UITextField *ageTextField;@property (weak, nonatomic) IBOutlet UITextField *noTextField;@property (weak, nonatomic) IBOutlet UITextField *birthdayTextField;@property (weak, nonatomic) IBOutlet UILabel *resultLabel;- (IBAction)birthdayChange:(UIDatePicker *)sender;- (IBAction)saveBut:(id)sender;- (IBAction)readBut:(id)sender;@end@implementation HJCodingController- (NSString *)docPath{    // 获取 "沙盒"document目录    if (_docPath == nil) {        _docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];        _docPath = [_docPath stringByAppendingPathComponent:@"data.archiver"];    }    return _docPath;}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    }- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {    // Get the new view controller using [segue destinationViewController].    // Pass the selected object to the new view controller.}*/- (IBAction)birthdayChange:(UIDatePicker *)sender {    NSDate *birthday = sender.date;    NSDateFormatter *df = [[NSDateFormatter alloc] init];    df.dateFormat = @"yyyy-MM-dd";    self.birthdayTextField.text = [df stringFromDate:birthday];    }- (IBAction)saveBut:(id)sender {    HJStudent *stu = [[HJStudent alloc] init];    stu.name = self.nameTextField.text;    stu.age = [self.ageTextField.text intValue];    NSDateFormatter *df = [[NSDateFormatter alloc] init];    df.dateFormat = @"yyyy-MM-dd";    stu.birthday = [df dateFromString:self.birthdayTextField.text];    stu.no = self.noTextField.text;        NSLog(@"%@",stu);        BOOL isSuccess = [NSKeyedArchiver archiveRootObject:stu toFile:self.docPath];    NSLog(@"%@",isSuccess?@"保存成功":@"保存失败");    }- (IBAction)readBut:(id)sender {    NSLog(@"%@",self.docPath);    HJStudent *stu = [NSKeyedUnarchiver unarchiveObjectWithFile:self.docPath];    NSLog(@"%@",stu);    self.resultLabel.text = [NSString stringWithFormat:@"%@,%d,%@,%@",stu.name,stu.age,stu.birthday,stu.no];}@end