plist文件的 偏好设置 存储与读取 自定义对象归档

plist文件的存储读取

#import "HMViewController.h"

@interface HMViewController ()

@end

@implementation HMViewController
// 当点点击保存的时候调用
- (IBAction)save:(id)sender {
    // 获取沙盒的根路径
//    NSString *home = NSHomeDirectory();
    
    // 拼接Documents路径
//    NSString *docPath = [home stringByAppendingString:@"/Documents"];
//    NSString *docPath = [home stringByAppendingPathComponent:@"Documents"];
    
    
    /**
     *  NSDocumentDirectory : 查找Documents文件夹
        NSUserDomainMask ： 在用户的应用程序下查找
     YES 把路径展开 NO 当前应用的根路径 == ~ 
     NO  ~/Documents

     */
    NSString *docPath =  NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
    NSLog(@"%@",docPath);
    
    // 拼接文件路径
    NSString *filePath = [docPath stringByAppendingPathComponent:@"data.plist"];
    
    // 只有具备writeToFile:的对象才能使用plist存储，NSArray
    NSArray *array = @[@1,@2,@"123"];
    
    [array writeToFile:filePath atomically:YES];
    
//    NSLog(@"%@",docPath);
    
    
    
}

//当点击读取的时候调用
- (IBAction)read:(id)sender {
    NSString *docPath =  NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
    NSLog(@"%@",docPath);
    
    // 拼接文件路径
    NSString *filePath = [docPath stringByAppendingPathComponent:@"data.plist"];
    
   NSArray *data = [NSArray arrayWithContentsOfFile:filePath];
    NSLog(@"%@",data);
    
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

偏好设置的存储与读取

#import "HMViewController.h"

@interface HMViewController ()

@end

@implementation HMViewController
- (IBAction)save:(id)sender {
    
    // [NSUserDefaults standardUserDefaults]可以直接操作偏好设置文件夹
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    
    // 自动帮我们生成一个plist文件存放在偏好设置的文件夹
    [defaults setObject:@"hm" forKey:@"account"];
    
    // 同步：把内存中的数据和沙盒同步
    [defaults synchronize];
    
}
- (IBAction)read:(id)sender {
    // [NSUserDefaults standardUserDefaults]可以直接操作偏好设置文件夹
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

   NSLog(@"%@",[defaults objectForKey:@"account"]);
    
//    NSDictionary *dict = @{@"account":@"hm"};
//    
//    dict writeToFile:<#(NSString *)#> atomically:<#(BOOL)#>
    
}

/*
    偏好设置的好处
    不用关心文件名
    快速进行键值对存储的时候用偏好设置
 
 
 */

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

自定义对象归解档

//
//  HMPerson.h
//  08-自定义对象归档
//
//  Created by yz on 14-8-29.
//  Copyright (c) 2014年 iThinker. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface HMPerson : NSObject<NSCoding>

@property (nonatomic, assign) int age;

@end

//
//  HMPerson.m
//  08-自定义对象归档
//
//  Created by yz on 14-8-29.
//  Copyright (c) 2014年 iThinker. All rights reserved.
//

#import "HMPerson.h"

@implementation HMPerson

// 在对象归档的时候调用
// 哪些属性需要归档
// 这些属性怎么归档
- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeInt:_age forKey:@"age"];
}

// 在对象解档的时候调用
// 哪些属性需要解档
// 这些属性怎么解档

- (id)initWithCoder:(NSCoder *)aDecoder
{
    // 当父类实现了NSCoding，就能调用 [super initWithCoder]
    if (self = [super init]) {
        _age = [aDecoder decodeIntForKey:@"age"];
    }
    return self;
}

@end

//
//  HMViewController.m
//  08-自定义对象归档
//
//  Created by yz on 14-8-29.
//  Copyright (c) 2014年 iThinker. All rights reserved.
//

#import "HMViewController.h"

#import "HMPerson.h"

@interface HMViewController ()

@end

@implementation HMViewController

- (IBAction)save:(id)sender {
    HMPerson *person = [HMPerson new];
    person.age = 18;
    
    NSString *docPath =  NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
    
    // 拼接文件路径
    NSString *filePath = [docPath stringByAppendingPathComponent:@"person.data"];
    
    [NSKeyedArchiver archiveRootObject:person toFile:filePath];
    

}
- (IBAction)read:(id)sender {
    NSString *docPath =  NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
    
    // 拼接文件路径
    NSString *filePath = [docPath stringByAppendingPathComponent:@"person.data"];
    
    HMPerson *p = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
    NSLog(@"%d",p.age);
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end