如何对包含 NSDictionary 的 NSArray 进行排序？

Posted 2023-03-04

【中文标题】如何对包含 NSDictionary 的 NSArray 进行排序？

【英文标题】：How to sort a NSArray which contains NSDictionary?

【发布时间】：2011-01-22 10:03:25

【问题描述】：

我有一个这样的列表：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
 <key>highscores</key>
 <array>
  <dict>
   <key>highscoreInSeconds</key>
   <string>9</string>
   <key>levelName</key>
   <string>1</string>
   <key>name</key>
   <string>Black</string>
  </dict>
  <dict>
   <key>highscoreInSeconds</key>
   <string>12</string>
   <key>levelName</key>
   <string>1</string>
   <key>name</key>
   <string>Black</string>
  </dict>
 </array>
</dict>
</plist>

现在我想按highscoreInSeconds 对其进行排序。

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *plistDirectory = [paths objectAtIndex:0];
 NSString* fullPath = [plistDirectory stringByAppendingPathComponent:@"data.plist"];

 NSMutableDictionary* pData = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath];
 NSMutableArray* highscores = [pData valueForKey:@"highscores"];

我现在该如何排序？

非常感谢！ :)

祝你有美好的一天。

PS：最后应该是这样的：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
 <key>highscores</key>
 <array>
  <dict>
   <key>highscoreInSeconds</key>
   <string>12</string>
   <key>levelName</key>
   <string>1</string>
   <key>name</key>
   <string>Black</string>
  </dict>
  <dict>
   <key>highscoreInSeconds</key>
   <string>9</string>
   <key>levelName</key>
   <string>1</string>
   <key>name</key>
   <string>Black</string>
  </dict>
 </array>
</dict>
</plist>

你不需要告诉我如何写一个我知道的 plist。

【参考方案1】：

我用这个：

NSArray* sorted = [highscoreAll sortedArrayUsingComparator:(NSComparator)^(NSDictionary *item1, NSDictionary *item2) 
            NSString *score1 = [item1 objectForKey:@"highscoreInSeconds"];
            NSString *score2 = [item2 objectForKey:@"highscoreInSeconds"];
            return [score1 compare:score2 options:NSNumericSearch];
            ];

它成功了。

【参考方案2】：

你可以使用

- (NSArray *)sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))comparator context:(void *)context

实现一个函数，说明 2 个字典中哪一个的排序值更大。

NSInteger intSort(id value1, id value2, void *context)

    id v1 = [value1 valueforkey:@""];//give required key
    id v2 = [value2 valueforkey:@""];//give required key
    if (v1 < v2) // do comparison based on the data type
        return NSOrderedAscending;
    else if (v1 > v2)
        return NSOrderedDescending;
    else
        return NSOrderedSame;

【讨论】：

但我会投票赞成你的答案，因为我认为它也会起作用

【参考方案3】：

 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *plistDirectory = [paths objectAtIndex:0];
 NSString* fullPath = [plistDirectory stringByAppendingPathComponent:@"data.plist"];

 NSMutableDictionary* pData = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath];
 NSMutableArray* highscores = [pData valueForKey:@"highscores"];

现在使用... 您可以使用 NSSortDescriptor 进行此操作，并且非常易于使用。 只需提供您要对数组进行排序的键..

NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"highscores" ascending:YES];
[highscores sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];
[descriptor release];

希望对你有帮助，

【参考方案4】：

NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"interest"      ascending:YES];
[stories sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];
recent = [stories copy];

【讨论】：

键值是int，现在怎么排序呢？