使用多個描述符對對象進行排序

-1

我正在嘗試對一系列英雄（對象）進行排序。每個英雄是那種使用多個描述符對對象進行排序

@interface Hero : NSObject <NSCoding> 

@property (strong,nonatomic) NSString *name; 
@property (strong,nonatomic) NSString *correctAnswers; 
@property (strong,nonatomic) NSString *falseAnswers; 
@property (strong,nonatomic) NSString *bonus; 
@property (strong,nonatomic) NSString *level; 

-(NSInteger*) inLevel; 

+(Hero*) createHero:(NSString*)name 
      inLevel:(NSString*)level 
      withBonus:(NSString*)bonus 
    correctAnswers:(NSString*)correctAnswers 
     andFalseOnes:(NSString*)falseAnswers; 

- (NSString *)description; 

@end

進行梳理這些英雄的數組我寫了一個sortfunction有兩個描述

-(void) sortHeros { 
    NSSortDescriptor *level = [NSSortDescriptor sortDescriptorWithKey:@"level" ascending:YES comparator:^NSComparisonResult(id a, id b) { 
     Hero *hero1 = a; 
     Hero *hero2 = b; 

     int levelHero1 = [hero1.level intValue]; 
     int levelHero2 = [hero2.level intValue]; 

     if (levelHero1 > levelHero2) { 
      return (NSComparisonResult)NSOrderedAscending; 
     } else if (levelHero1 < levelHero2) { 
      return (NSComparisonResult)NSOrderedDescending; 
     } 

     return (NSComparisonResult)NSOrderedSame; 
    }]; 

    NSSortDescriptor *bonus = [NSSortDescriptor sortDescriptorWithKey:@"bonus" ascending:YES comparator:^NSComparisonResult(id a, id b) { 
     Hero *hero1 = a; 
     Hero *hero2 = b; 

     int bonusHero1 = [hero1.bonus intValue]; 
     int bonusHero2 = [hero2.bonus intValue]; 

     if (bonusHero1 > bonusHero2) { 
      return (NSComparisonResult)NSOrderedAscending; 
     } else if (bonusHero1 < bonusHero2) { 
      return (NSComparisonResult)NSOrderedDescending; 
     } 

     return (NSComparisonResult)NSOrderedSame; 
    }]; 

    NSArray *sortedArray; 
    sortedArray = [self.heros sortedArrayUsingDescriptors:[NSArray arrayWithObjects:level, bonus, nil]]; 

    self.heros = [sortedArray mutableCopy]; 
}

Unfotunately它同時與

調用sortedArrayUsingDescriptors排序時5個對象的數組崩潰

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString bonus]: unrecognized selector sent to instance 0x9674520'

我不知道是怎麼回事。有人可以指出我的錯誤嗎？

-------自我解決----------- 嘿謝謝指出解決方案。這是我的正確的代碼爲其他人有同樣的問題。

@interface Hero ... 
-(NSString*) heroBonus; 
-(NSString*) heroLevel; 
@end 

-(void) sortHeros { 
    NSSortDescriptor *level = [NSSortDescriptor sortDescriptorWithKey:@"heroLevel" ascending:NO comparator:^NSComparisonResult(id a, id b) { 
     int levelHero1 = [a intValue]; 
     int levelHero2 = [b intValue]; 

     ... 
    }]; 

    NSSortDescriptor *bonus = [NSSortDescriptor sortDescriptorWithKey:@"heroBonus" ascending:NO comparator:^NSComparisonResult(id a, id b) { 
     int bonusHero1 = [a intValue]; 
     int bonusHero2 = [b intValue]; 

     ... 
    }]; 
    ... 
}

來源

2013-10-07 user62138

你有一個NSString *稱爲」獎金「和NSSortDescriptor *稱爲」獎金。「也許只是我，但編譯器也可能會感到困惑 –

顯示你正在收到崩潰的確切線 – Justin

我也會將獎勵排序描述符的名稱改爲sortBonus或者其他東西 – Justin

它告訴你，你發送keypath的類沒有爲「獎金」實現getter或方法。這也是說「NSCFString，這意味着你發送bonus keyPath到一個字符串對象而不是一個Hero對象。

來源

2013-10-07 19:42:32 Justin

使用多個描述符對對象進行排序

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