ios数据持久化 - NSKeyedArchiver（归档）

所谓归档:将复杂对象转化为NSData类型数据(复杂-->归档-->NSData--->WriteToFile/plist方式)

注意:归档是将对象转化为数据字节,以文件的形式存储在磁盘上,

所谓反归档:将NSData类型数据转化为复杂对象(读取文件-->NSData-->反归档--->复杂对象)

归档的三种方式:

1:对自定义的对象进行归档

2:对foundation框架的对象进行归档

3:对自定义内容进行归档

注意:归档生成的文件是加密的

开始使用

1:对自定义的对象进行归档

1>.创建模型 ，并遵守NSCoding代码

@interface NSKeyedArchiverModel : NSObject<NSCoding>

2>.定义基本属性

@property(nonatomic,strong)NSString *name;

@property(nonatomic,strong)NSString *gender;

@property(nonatomic,assign)int age;

3>.实现代理方法

//归档(序列化)

//对NSKeyedArchiverModel对象进行归档时,此方法执行

//对NSKeyedArchiverModel中想要进行归档的所有属性,进行序列化操作

-(void)encodeWithCoder:(NSCoder *)aCoder

{

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

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

[aCoder encodeInt:self.age forKey:@"age"];

}

//反归档(反序列化)

//对NSKeyedArchiverModel对象进行反归档时,该方法执行

//创建一个新的NSKeyedArchiverModel对象,所有属性都是通过反序列化得到

-(instancetype)initWithCoder:(NSCoder *)aDecoder

{

if (self = [super init]) {

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

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

self.age = [aDecoder decodeIntForKey:@"age"];

}

return self;

}

4>.设置数据并进行归档操作

NSKeyedArchiverModel *per = [NSKeyedArchiverModel new];

per.name = @"小美眉";

per.gender = @"女";

per.age = 18;

//准备路径:

NSString *path = NSHomeDirectory();

NSLog(@"%@",path);

path = [path stringByAppendingPathComponent:@"singeGirl.txt"];

//1:准备存储数据的对象

NSMutableData *data = [NSMutableData data];

//2:创建归档对象

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

//3:开始归档

[archiver encodeObject:per forKey:@"person"];

//4:完成归档

[archiver finishEncoding];

//5:写入文件当中

BOOL result = [data writeToFile:path atomically:YES];

if (result) {

NSLog(@"归档成功:%@",path);

}else

{

NSLog(@"归档不成功!!!");

}

5>.---  反归档/反序列化/解码/解档 ----

//准备解档路径

NSData *myData = [NSData dataWithContentsOfFile:path];

//创建反归档对象

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

//反归档

per = [unarchiver decodeObjectForKey:@"person"];

//完成反归档

[unarchiver finishDecoding];

//测试

NSLog(@"解码输出=%@=%@=%d",per.name,per.gender,per.age);

2:对foundation框架的对象进行归档

//归档

//1:创建路径

NSString *Doucuments = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];

NSString *path = [Doucuments stringByAppendingString:@"file.plist"];

//2:归档(不需要结束方法)

NSDictionary *dict = @{

@"name" : @"HJM",

@"age"  : @18,

@"sex"  : @"男",

@"arr"  : @[@1,@2,@3],

};

BOOL result = [NSKeyedArchiver archiveRootObject:dict toFile:path];

if (result) {

NSLog(@"框架中的归档%@",path);

}

//反归档

NSDictionary *newArray = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

NSLog(@"框架的结档%@ =%@",newArray,newArray[@"name"]);

3:自定义内容进行归档和自定义的对象进行归档大至一样。