自定义类归档

来源：互联网发布：i3 2100安装Mac OS 编辑：程序博客网时间：2024/06/05 15:45

自定义类如果需要归档的话,需要遵守NSCoding协议,并实现两个方法:

- (void)encodeWithCoder:(NSCoder *)aCoder;- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder;

下面以自定义 Person 类为例:

//.h文件#import <Foundation/Foundation.h>@interface Person : NSObject <NSCoding>@property (nonatomic, copy) NSString *name;@property (nonatomic, assign) NSUInteger age;@end//.m文件#import "Person.h"@implementation Person/**   数据归档调用    (1)那些属性需要归档    (2)这些属性如何归档 */- (void)encodeWithCoder:(NSCoder *)aCoder{    [aCoder encodeObject:self.name forKey:@"name"];    [aCoder encodeInteger:self.age forKey:@"age"];}/**  数据解档调用     (1)那些属性需要解档    (2)如何解档 */- (instancetype)initWithCoder:(NSCoder *)aDecoder{    //当父类中又 NSCoding 协议的时候,用[super initWithCoder:aDecoder];    self = [super init];    if (self) {        _name = [aDecoder decodeObjectForKey:@"name"];        _age = [aDecoder decodeIntegerForKey:@"age"];    }    return self;}//类似于java的toString方法- (NSString *)description{   return [NSString stringWithFormat:@"name: %@, age: %zd", self.name, self.age];}@end

主文件main.m

//初始化自定义类        Person *person = [[Person alloc] init];        person.name = @"张三";        person.age = 20;        //获取存储路径        NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];        NSString *filePath = [cachesPath stringByAppendingPathComponent:@"person.data"];        //数据归档        [NSKeyedArchiver archiveRootObject:person toFile:filePath];        //数据解档        Person *p = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];        NSLog(@"%@",p);

最终的结果为:
test[8814:79293] name: 张三, age: 20

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