ios如何把一个包含自定义对象的数组序列化到磁盘？

Question

我想把一个包含自定义的对象的数组写到磁盘如：User*user1=[Useralloc]init];User*user2=[Useralloc]init];NSArray*userArr=@[user1,user2];该怎么做？

Answer 1

你的自定义对象实现NSCoding协议，然后在.m里面实现下面两个方法
-(instancetype)initWithCoder:(NSCoder*)aDecoder{
self=[superinit];
if(self){
self.objectID=[aDecoderdecodeObjectForKey:@"objectID"];
self.createdAt=[aDecoderdecodeObjectForKey:@"createdAt"];
self.updatedAt=[aDecoderdecodeObjectForKey:@"updatedAt"];
}
returnself;
}
-(void)encodeWithCoder:(NSCoder*)aCoder{
[aCoderencodeObject:self.objectIDforKey:@"objectID"];
[aCoderencodeObject:self.createdAtforKey:@"createdAt"];
[aCoderencodeObject:self.updatedAtforKey:@"updatedAt"];
}
再然后用那个NSKeyedArchiver就可以了
                            

Answer 2

NSData*tempArchive=[NSKeyedArchiverarchivedDataWithRootObject:userArr];
NSArray*arr=[NSKeyedUnarchiverunarchiveObjectWithData:tempArchive];