整理--iOS如何把一个包含自定义对象的数组序列化到磁盘

想把一个包含自定义的对象的数组写到磁盘
如下：
User *user1 = [User alloc] init];
User *user2 = [User alloc] init];
NSArray *userArr = @[user1,user2];

方法如下：

先将自定义对象实现NSCoding协议，然后在.m里面实现下面两个方法。

-(instancetype)initWithCoder:(NSCoder *)aDecoder{    self = [super init];    if (self) {        self.objectID = [aDecoder decodeObjectForKey:@"objectID"];        self.createdAt = [aDecoder decodeObjectForKey:@"createdAt"];        self.updatedAt = [aDecoder decodeObjectForKey:@"updatedAt"];    }    return self;}-(void)encodeWithCoder:(NSCoder *)aCoder{    [aCoder encodeObject:self.objectID forKey:@"objectID"];    [aCoder encodeObject:self.createdAt forKey:@"createdAt"];    [aCoder encodeObject:self.updatedAt forKey:@"updatedAt"];}

再然后用NSKeyedArchiver就可以了。

NSData* tempArchive = [NSKeyedArchiver archivedDataWithRootObject:userArr];NSArray* arr = [NSKeyedUnarchiver unarchiveObjectWithData:tempArchive];