iPhone dev - 将对象数组写入/读取到文件

Question

我有一个名为 listOfContactsToLay 的数组 - 它包含带有 3 个字符串字段的联系人对象。如何才能成功将该数组写入文件？这是我得到的:

-(NSString*)fPath
{
    return [DocumentsDirectory() stringByAppendingPathComponent:@"quickdial.xml"];
}

//SERIALIZATION
- (void) save:(NSMutableArray*)array
{

   [NSKeyedArchiver archiveRootObject:array toFile:[self fPath]]; 

    NSLog(@"List of contacts been written in file");

}

// get that array back
- (NSMutableArray*)load
{
    NSLog(@"List of contacts is being read from file");
    return [NSKeyedUnarchiver unarchiveObjectWithFile:[self fPath]];

}

当然，以下内容不起作用:

-(IBAction)doneWithContacts {
    [ContactManager createXmlInMydocumentsDirectory];
[self save:listOfContactsToLay];
    NSLog(@"List of contacts to lay saved!");
    [self.parentViewController dismissModalViewControllerAnimated:YES];

}

它抛出无效参数异常。

我该怎么办？如何序列化对象的 MSMutableArray？谢谢

Answer 1

您的Contact类是否符合NSCoding协议(protocol)。

More info .