存储和检索多维NSMutableArrays的最佳方法是什么？ [英] What's the best way to store and retrieve multi-dimensional NSMutableArrays?

问题描述

我将一堆数据存储在.plist文件中（在应用程序文档文件夹中），其结构如下：

I'm storing a bunch of data in a .plist file (in the application documents folder), and it's structured like this:

Dictionary {
    "description" = "String Value",
    "sections" = Array (
        Array (
            Number,
            ...
            Number
        ),
        Array (
            Number,
            ...
            Number
        )
    ),
    "items" = Array (
        Array (
            Number,
            ...
            Number
        ),
        Array (
            Number,
            ...
            Number
        )
    )
}

如果我只是用

NSMutableDictionary * d = [[NSMutableDictionary alloc] initWithContentsOfFile：plistFile]
我将不会检索它能够替换数字对象，对吗？
所以我现在正在递归数据并形成整个事物的可变版本，它在一个实例中工作，但现在它告诉我发送到不可变对象的变异方法当整个事情变得可变时。

If I just retrieve it with
NSMutableDictionary *d = [[NSMutableDictionary alloc] initWithContentsOfFile:plistFile] I won't be able to replace the number objects, correct? So I'm recursing through the data right now and forming a mutable version of the whole thing, and it worked in one instance, but now it's telling me mutating method sent to immutable object when the whole thing is mutable.

有没有更简单/更好的方法呢？如果它有所不同，我的数据只是整数和布尔值。

Is there an easier/better way to do this? If it makes a difference, my data is just integers and booleans.

推荐答案

不应该写所有自定义类垃圾，你应该使用 NSPropertyListSerialization 。具体来说，请参阅 propertyListWithData：options：format：error：方法。用法示例：

Instead of writing all that custom class junk, you should use NSPropertyListSerialization. Specifically, see the propertyListWithData:options:format:error: method. Example usage:

NSMutableDictionary *d = [NSPropertyListSerialization propertyListWithData:[NSData dataWithContentsOfFile:@"path/to/file"] 
                                                                   options:NSPropertyListMutableContainers
                                                                    format:NULL
                                                                     error:NULL];

这将使所有容器都可变，但保持叶节点（例如NSStrings）不可变。还有一个选项可以让树叶变得可变。

This will make all the containers mutable, but keep the leaf nodes (e.g. NSStrings) immutable. There's also an option to make the leaves mutable too.

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