iPhone Obj C-对字典的可变数组进行排序-显示字符串但按值排序 [英] iPhone Obj C -- Sorting a Mutable Array of dictionaries -- display a string but sort by value

问题描述

我有一个带有30个字典的NSMutableArray.每个都包含一个名称和一个值.我目前对名称进行了排序，以便在表视图中按字母顺序显示.但是，我想制作一个UIButton来提供STILL DISPLAYING THE NAMES的选项，但按值排序.该值不需要显示.另外，这些代码将放在.m/.h文件中的什么位置?谢谢！

I have a NSMutableArray with 30 dictionaries inside of it. Each contains a name and a value. I currently have the names sorted so that the show in a table view alphabetically. However, I'd like to make a UIButton to give the option of STILL DISPLAYING THE NAMES, but ordered by the value. The value doesn't need to be displayed. Also, where in the .m/.h files would these codes be placed? THANKS!

推荐答案

为了能够帮助您，我需要使用测试数据.假设您的数据数组如下所示:

To be able to help you I need a test data to work with. Let's say your array with data looks like this:

NSMutableArray *aMutableArray = [NSMutableArray arrayWithObjects:
         [NSDictionary dictionaryWithObjectsAndKeys:
          @"A", @"name",
          [NSNumber numberWithInt:6], @"value", nil],
         [NSDictionary dictionaryWithObjectsAndKeys:
          @"C", @"name",
          [NSNumber numberWithInt:2], @"value", nil],
         [NSDictionary dictionaryWithObjectsAndKeys:
          @"B", @"name",
          [NSNumber numberWithInt:4], @"value", nil], nil];

在这种情况下，这是按值对它进行排序的方式:

In this case case here's how you sort it by value:

NSSortDescriptor *aSortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"value" ascending:YES];
[aMutableArray sortUsingDescriptors:[NSArray arrayWithObject:aSortDescriptor]];

关于此代码的放置位置，请将其放置在需要重新排序的位置(当然在实现[.m]文件中).

As for where to place this code place it wherever you need the reordering to happen (in the implementation [.m] file of course).

HTH，如果有任何问题，请在评论中问他们.

HTH and if there will be any questions ask them in the comments.

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