排序按字典的鍵

Question

可變數組我已經通過使用NSMutableArray各種排序方法的幾個答案，看了看，但出於某種原因，他們不是爲我工作。

我只是試圖按每個字典中的Delay鍵對包含字典的可變數組進行排序。但是，「排序」數組與原始數組完全相同。

順便說一句，如果我創建一個虛擬可變數組，幷包含數字字典填充它工作正常，但由於某種原因，它不會進行排序，我這個初始化可變數組。

我在做什麼錯？

這裏是我的代碼：

playlistCalls = [[NSMutableArray alloc] initWithArray:[currentPlaylist objectForKey:@"Tunes"]]; 

NSLog(@"original %@", playlistCalls); 

NSSortDescriptor *delay = [NSSortDescriptor sortDescriptorWithKey:@"Delay" ascending:YES]; 
[playlistCalls sortUsingDescriptors:[NSArray arrayWithObject:delay]]; 

NSLog(@"sorted %@", playlistCalls); 

下面是一個包含字典數組：

2012-06-04 15:48:09.129 MyApp[57043:f503] original (
     { 
     Name = Test Tune; 
     Delay = 120; 
     Volume = 100; 
    }, 
     { 
     Name = Testes; 
     Delay = 180; 
     Volume = 100; 
    }, 
     { 
     Name = Testing; 
     Delay = 60; 
     Volume = 100; 
    } 
) 

2012-06-04 15:48:09.129 MyApp[57043:f503] sorted (
     { 
     Name = Test Tune; 
     Delay = 120; 
     Volume = 100; 
    }, 
     { 
     Name = Testes; 
     Delay = 180; 
     Volume = 100; 
    }, 
     { 
     Name = Testing; 
     Delay = 60; 
     Volume = 100; 
    } 
) 

Answer 1

工作上面的代碼是罰款當我在我的字典中使用NSNumber。這使我相信，Delay值存儲在你的字典字符串。你需要做的是按字符串排序integerValue。

NSSortDescriptor *delay = 
    [NSSortDescriptor sortDescriptorWithKey:@"Delay.integerValue" ascending:YES]; 

Answer 2

請嘗試以下方法，它與我

NSDictionary *dic; 
NSMutableArray *arr = [[NSMutableArray alloc] init]; 

dic = [NSDictionary dictionaryWithObjectsAndKeys: 
     [NSNumber numberWithInt:120], @"Delay", 
     [NSNumber numberWithInt:100], @"Volume", 
     nil]; 
[arr addObject:dic]; 

dic = [NSDictionary dictionaryWithObjectsAndKeys: 
     [NSNumber numberWithInt:160], @"Delay", 
     [NSNumber numberWithInt:100], @"Volume", 
     nil]; 
[arr addObject:dic]; 

dic = [NSDictionary dictionaryWithObjectsAndKeys: 
     [NSNumber numberWithInt:100], @"Delay", 
     [NSNumber numberWithInt:100], @"Volume", 
     nil]; 
[arr addObject:dic]; 

NSSortDescriptor *sortDesc = [[NSSortDescriptor alloc] initWithKey:@"Delay" ascending:YES]; 
[arr sortUsingDescriptors:[NSArray arrayWithObject:sortDesc]];