ios- 归档 解档

#import <Foundation/Foundation.h>

@interface User : NSObject<NSCoding>

@property (nonatomic, copy)NSString *name;

@property (nonatomic, copy)NSString *passwd;

+ (User *)userWithName:(NSString *)name password:(NSString *)
password;

@end

#import "User.h"

@implementation User

+ (User *)userWithName:(NSString *)name password:(NSString *)password
{
User *user = [[User alloc]init];
user.name = name;
user.passwd = password;

return user;
}

//归档调用方法
- (void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:self.name forKey:@"name"];
[aCoder encodeObject:self.passwd forKey:@"passwd"];

}

//接档调用方法
//取值
- (id)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super init]) {
self.name = [aDecoder decodeObjectForKey:@"name"];
self.passwd = [aDecoder decodeObjectForKey:@"passwd"];
}
return self;
}
@end

#import "ViewController.h"
#import "User.h"
#import "UserDefaultKeysConfig.h"

@interface ViewController ()
#pragma mark - 属性方法定义
@property (weak, nonatomic) IBOutlet UITextField *usernameTextField;
@property (weak, nonatomic) IBOutlet UITextField *passwdTextField;

- (IBAction)loginBtn:(id)sender;
- (IBAction)exitBtn:(id)sender;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

//    self.usernameTextField.text = @"angel";
//    self.passwdTextField.text = @"123456";
//
//    self.usernameTextField.text = [[NSUserDefaults standardUserDefaults]objectForKey:kUserNameKey];
//    self.passwdTextField.text = [[NSUserDefaults standardUserDefaults]objectForKey:kUserPwdKey];
// Do any additional setup after loading the view, typically from a nib.

User *user = [self userFromArachiver];
self.usernameTextField.text = user.name;
self.passwdTextField.text = user.passwd;

}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.
}

#pragma mark - 存储信息
//点击登陆按钮 将信息存储到沙盒
- (IBAction)loginBtn:(id)sender {

//    [[NSUserDefaults standardUserDefaults]setObject:self.usernameTextField.text forKey:kUserNameKey];
//    [[NSUserDefaults standardUserDefaults]setObject:self.passwdTextField.text forKey:kUserPwdKey];
//
//    //同步写入文件
//    [[NSUserDefaults standardUserDefaults]synchronize];

//1.封装数据模型 用提供的类方法快速创建一个类
User *user = [User userWithName:self.usernameTextField.text password:self.passwdTextField.text];
[self saveUserObjectWithUser:user];

}

#pragma mark - 解归档

- (User *)userFromArachiver
{
//1.首先判断文件是否存在
if(![[NSFileManager defaultManager] fileExistsAtPath:[[self class]path]])
{
return nil;
}

//2.读取data对象
NSData *data = [NSData dataWithContentsOfFile:[[self class]path]];

//3.穿件解归档对象
NSKeyedUnarchiver *unarchive = [[NSKeyedUnarchiver alloc]initForReadingWithData:data];

//4.解档 创建接受对象
User * user =  [unarchive decodeObjectForKey:@"user"];

//5.完成解档
[unarchive finishDecoding];

NSLog(@"%@",user.name);
NSLog(@"%@---",user.passwd);

return user;

}

#pragma mark - 归档
/**
*  归档
*
*  @param user <#user description#>
*/
- (void)saveUserObjectWithUser:(User *)user
{
//我们要将自定义对象转化为二进制流 并写入沙盒 我们要进行以下操作
//1.先创建一个NSMutableData对象
NSMutableData *data = [NSMutableData data];
//2.创建一个归档对象
NSKeyedArchiver *archive = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data];

//3.归档
[archive encodeObject:user forKey:@"user"];

//4.完成归档
[archive finishEncoding];

//5.写入文件
[data writeToFile: [[self class] path] atomically:YES];
}

//怎样调用一个类方法
+ (NSString *)path
{

NSString *chachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask , YES)lastObject];

return [chachePath stringByAppendingPathComponent:@"user"];
}

#pragma mark - 退出
- (IBAction)exitBtn:(id)sender {

[[NSUserDefaults standardUserDefaults]removeObjectForKey:kUserNameKey];
[[NSUserDefaults standardUserDefaults]removeObjectForKey:kUserPwdKey];
[[NSUserDefaults standardUserDefaults]synchronize];

self.usernameTextField.text = @"";
self.passwdTextField.text = @"";
}
@end