将自定义对象的NSArray转换为带有索引的按字母顺序排列的UITableView？ [英] Turning an NSArray of custom objects into a alphabetically sectioned UITableView with an index?

问题描述

（嗯......长标题）

如果我开始使用NSArray自定义对象（每个对象都是Person），就像这样：

'pre> {
姓：阿伦用名字：木香，
姓：巴克斯特用名字：斯坦利，
姓：粘土用的名字：Cassius
}


..等..

您可以看到该数组已经按姓氏顺序排列。如何使用该数组创建一个带有A，BC等节的UITableView，以及一个垂直运行的索引节点

  A 
 B 
 C 
  

编辑

我想我要问的是如何将我的对象数组转换成一个截面数组，包含Surnames的所有首字母和一个Surname数组这可能是这样的嵌套数组：

  {
 letter：a 
 {姓：Allen forename ：Woody} 
 letter：b 
 {姓：Baxter姓：Stanley} 
等
} 
  

事实上，也许只是一个嵌套数组。

解决方案

有可能百万种方式这样做:)在这里可能有用的（我相信它可以做得更漂亮，但是因为没有人回答）：

  NSMutableDictionary * aIndexDictionary = [[NSMutableDictionary alloc] init]; 
 NSMutableArray * currentArray; 
 NSRange aRange = NSMakeRange（0,1）; 
 NSString * firstLetter; 
 for（Person * aPerson in personArray）{
 firstLetter = [aPerson.surname substringWithRange：aRange]; 
 if（[aIndexDictionary objectForKey：firstLetter] == nil）{
 currentArray = [NSMutableArray array]; 
 [aIndexDictionary setObject：currentArray forKey：firstLetter]; 
} 
 [currentArray addObject：aPerson]; 
} 
  

未经测试......

(hmm.. long title)

If I start out with an NSArray of custom objects (each object is a Person) like this:

{
  surname:Allen   forename: Woody,
  surname:Baxter  forename: Stanley,
  surname:Clay    forename: Cassius
}

..etc..

You can see that the array is already in surname order. How do I use that array to create a a UITableView with a section headers A, B C etc, as well as an index thing on the side running vertically

                                                               A
                                                               B
                                                               C

EDIT

I guess what I'm asking is how to turn my array of objects into a Section Array, with all the first letters of the Surnames, and a Surname Array which is perhaps a nested array like this:

{ 
  letter: a
  {  surname:Allen   forename: Woody   }
  letter: b
  {  surname:Baxter  forename: Stanley }
  etc
} 

In fact, perhaps just a nested array will do.

解决方案

There are probably a million ways of doing this :) Here's one that might work (I am sure it can be done much prettier, but since no one is answering):

NSMutableDictionary *aIndexDictionary = [[NSMutableDictionary alloc] init]; 
NSMutableArray *currentArray;
NSRange aRange = NSMakeRange(0, 1);
NSString *firstLetter;
for (Person *aPerson in personArray) {
  firstLetter = [aPerson.surname substringWithRange:aRange];
  if ([aIndexDictionary objectForKey:firstLetter] == nil) {
    currentArray = [NSMutableArray array];
    [aIndexDictionary setObject:currentArray forKey:firstLetter];
  }
  [currentArray addObject:aPerson];
}

Untested...

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