如何创建嵌套数组或多维数组 [英] How to create nested array or multidimensional array

问题描述

我试图找出如何使用objective-c为iPhone SDK编程做嵌套数组或多维数组。

I am trying to figure out how to do either nested arrays or multidimensional array for iPhone SDK programming using objective-c.

我的数据是这样的， 3列和10到50行。

My data would be something like this, 3 columns and rows from 10 to 50.

name     department     year
John     Sales          2008
Lisa     Sales          2009
Gina     Support        2007

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推荐答案

我不确定这是你的例子还是你的术语，但这不是一个多维数组，这是一个记录数组。我会把你的每个记录都写成一个类：

I'm not sure whether it's your example or your terminology, but that's not really a multi-dimensional array, that's an array of records. I'd make each of your records a class:

@interface Employee
  NSString* name;
  NSString* dept;
  NSString* year;
@end

@property (nonatomic,retain) NSString* name;
@property (nonatomic,retain) NSString* dept;
@property (nonatomic,retain) NSString* year;

// ... rest of class def


Employee* a = [[Employee alloc] init];
a.name = @"Bob";
a.dept = @"Sales";
a.year = @"2008";

// declare others

NSArray* array = [NSArray arrayWithObjects:a,b,c,nil];
[a release];

这比使用 struct 。

如果你的确意味着一个多维数组，那么明显的方法就没有错。当然你可能想把它包装在一个类中，这样你也可以编写一些实用工具方法来使它更容易处理。

If you really do mean a multi-dimensional array then there's nothing wrong with the "obvious" approach. Of course you might want to wrap it up in a class so you can also write some utility methods to make it easier to deal with.

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