NSKeyedArchiver是NSCoder的具体子类,提供了一种方法来将对象(和标量值)编码成与体系结构无关的格式可以存储在一个文件中。NSKeyedArchiver可以存储的数据类型包括：NSString、NSArray、NSDictionary、NSData。
1、NSString归档与反归档
NSString *name = @"李四";
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];
path = [path stringByAppendingString:@"string"];
self.filePath = path;
[NSKeyedArchiver archiveRootObject:name toFile:path];
解档
NSString *string1 = [NSKeyedUnarchiver unarchiveObjectWithFile:self.filePath];
2、NSArray归档与反归档
NSArray *Array = @[@"1",@"10",@"100"];
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];
path = [path stringByAppendingString:@"Array"];
self.filePath = path;
[NSKeyedArchiver archiveRootObject:Array toFile:path];
解档
NSArray *array1 = [NSKeyedUnarchiver unarchiveObjectWithFile:self.filePath];
3、字典归档与反归档
NSDictionary *dict1 = @{@"name":@"潘凤",@"age":@"20"};
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];
path = [path stringByAppendingString:@"dict"];
self.filePath = path;
[NSKeyedArchiver archiveRootObject:dict1 toFile:path];
解档
NSDictionary *dict1 = [NSKeyedUnarchiver unarchiveObjectWithFile:self.filePath];
NSLog(@"dict1-------%@",dict1);
4、自定义归档类型
自定义对象需要遵守NSCoding协议，实现下面2个方法
-(void)encodeWithCoder:(NSCoder *)aCoder
-(id)initWithCoder:(NSCoder *)aDecoder
1、读取实例变量，并把这些数据写到NSCoder中去，即序列化数据
-(void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:self.name forKey:@"name"];
[aCoder encodeObject:self.sex forKey:@"sex"];
[aCoder encodeInteger:self.age forKey:@"age"];
[aCoder encodeObject:self.address forKey:@"address"];
}
2、从NSCoder中读取数据，保存到相应变量中，即反序列化数据
-(id)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super init]) {
self.name = [aDecoder decodeObjectForKey:@"name"];
self.sex = [aDecoder decodeObjectForKey:@"sex"];
self.age = [aDecoder decodeIntegerForKey:@"age"];
self.address = [aDecoder decodeObjectForKey:@"address"];
}
return self;
}
举例说明：
1、归档过程
JFModel *model = [[JFModel alloc]init];
model.name = @"张三";
model.sex = @"男";
model.age = 10;
model.address = @"北京";
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];
path = [path stringByAppendingString:@"/model.plist"];
self.filePath = path;
NSLog(@"path------%@",path);
[NSKeyedArchiver archiveRootObject:model toFile:path];
2、反归档过程
JFModel *model1 = [NSKeyedUnarchiver unarchiveObjectWithFile:self.filePath];
NSLog(@"姓名：%@---性别：%@---年龄：%ld---住址：%@",model1.name,model1.sex,model1.age,model1.address);
