iOS 数据归档----温故而知新

#import "StudyViewController.h"

#import "person.h"

@interface StudyViewController ()

@property (nonatomic, copy)NSString *filePath;

@end

@implementation StudyViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view.

person *p1 = [[person alloc]init];

p1.name = @"zhangshan";

person *p2 = [[person alloc]init];

p2.name = @"lisi";

person *p3 = [[person alloc]init];

p3.name = @"wangwu";

NSArray *pathArr = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *filePath = [pathArr[0] stringByAppendingPathComponent:@"model"];

self.filePath = filePath;

//归档单个数据

//[NSKeyedArchiver archiveRootObject:p toFile:filePath];

//归档多个数据

NSMutableData *data = [[NSMutableData alloc]init];

NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data];

[archiver encodeObject:p1 forKey:@"p1"];

[archiver encodeObject:p2 forKey:@"p2"];

[archiver encodeObject:p3 forKey:@"p3"];

[archiver finishEncoding];

if ([data writeToFile:self.filePath atomically:YES]) {

NSLog(@"归档成功。。。");

}

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

{

if ([[NSFileManager defaultManager]fileExistsAtPath:self.filePath]) {

//解档单个数据

//        person *p = [NSKeyedUnarchiver unarchiveObjectWithFile:self.filePath];

//        NSLog(@"p.name =%@",p.name);

//解档多个数据

NSData *data = [NSData dataWithContentsOfFile:self.filePath];

NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:data];

person *p1 = [unarchiver decodeObjectForKey:@"p1"];

person *p2 = [unarchiver decodeObjectForKey:@"p2"];

person *p3 = [unarchiver decodeObjectForKey:@"p3"];

NSLog(@"p1 =%@\np2 =%@\np3 =%@",p1.name,p2.name,p3.name);

}

}

@end

#import <Foundation/Foundation.h>

@interface person : NSObject<NSCoding>

@property (nonatomic, copy)NSString *name;

@end

#import "person.h"

@implementation person

-(instancetype)initWithCoder:(NSCoder *)aDecoder

{

self = [super init];

if (self) {

self.name = [aDecoder decodeObjectForKey:@"name"];

}

return self;

}

-(void)encodeWithCoder:(NSCoder *)aCoder

{

[aCoder encodeObject:self.name forKey:@"name"];

}

@end