合并具有多个值的数组以形成一个数组/字典

Question

我有一个数组来自服务器的数据。我无法更改服务器的响应。

{ 
    maximum = 30; 
    minimum = 1; 
    name = "Layer 1"; 
}, 
    { 
    maximum = 60; 
    minimum = 45; 
    name = "Layer 1"; 
}, 
    { 
    maximum = 60; 
    minimum = 45; 
    name = "Layer 2"; 
} 

我在这个数组中有3个对象。其中2个名称相同，但具有不同的最小值和最大值。我想创建一个不会有重复的数组，因此例如我的数组中有2个对象，即“Layer 1”，“Layer 2”。第1层将具有2个最小值和最大值。

究竟应该如何样子：

{ 

    name = "Layer 1"; value = [{maximum = 30; 
    minimum = 1},{ maximum = 60; 
    minimum = 45}]; 
}, 
    { 
    maximum = 60; 
    minimum = 45; 
    name = "Layer 2"; 
} 

我试图检查索引对象的“名称”，“我”是在指数等于该对象的“名称”，“I + 1" ，但它crahses，它说：“超出范围（2）：

rows = [mivne_shichva count]; 

     NSMutableArray *layers = [[NSMutableArray alloc]init]; 
     NSMutableDictionary *layer = [[NSMutableDictionary alloc]init]; 

     for (int i = 0; i<rows; i++) { 
      if ([[[mivne_shichva objectAtIndex:i]valueForKey:@"name"] isEqualToString:[[mivne_shichva objectAtIndex:i+1]valueForKey:@"name"]]) { 
       NSLog(@"name equals to name in i+1"); 
      } 
      [layer setValue:[[mivne_shichva objectAtIndex:i]valueForKey:@"name"] forKey:@"name"]; 
      [layer setValue:[[mivne_shichva objectAtIndex:i]valueForKey:@"minimum"] forKey:@"minimum"]; 
      [layer setValue:[[mivne_shichva objectAtIndex:i]valueForKey:@"maximum"] forKey:@"maximum"]; 

      [layers addObject:layer]; 

      NSLog(@"layers :::: %@",layers);    
     } 

Answer 1

检查这一项， 逻辑是

最终的结果将是一个‘词典’ 的“二。 ctionary'键包含名称为'Layer 1' '字典'值包含'数组'。 '数组'包含'MinMax'的对象。

的MINMAX类：

@interface MinMax : NSObject 

@property(strong)NSString *minimum; 
@property(strong)NSString *maximum; 

@end 

MyClass类：

@interface MyClass : NSObject 

@property(strong) NSString *name; 
@property(strong) NSString *minimum; 
@property(strong) NSString *maximum; 

@end 

而且演示实现：

- (id)init 
{ 
    self = [super init]; 
    if (self) { 
     _finalDict=[NSMutableDictionary new]; 

     MyClass *obj1=[MyClass new]; 
     obj1.name=@"Layer 1"; 
     obj1.minimum=@"1"; 
     obj1.maximum=@"30"; 

     MyClass *obj2=[MyClass new]; 
     obj2.name=@"Layer 1"; 
     obj2.minimum=@"45"; 
     obj2.maximum=@"60"; 

     MyClass *obj3=[MyClass new]; 
     obj3.name=@"Layer 2"; 
     obj3.minimum=@"45"; 
     obj3.maximum=@"60"; 

     _fromServerArrays=[[NSMutableArray alloc]initWithObjects:obj1, obj2, obj3, nil]; 

    } 
    return self; 
} 

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification{ 

    for (MyClass *obj in _fromServerArrays) { 
     NSLog(@"From server : %@, %@, %@", obj.name, obj.minimum, obj.maximum); 
    } 


    for (MyClass *myClassObj in _fromServerArrays) { 
     MinMax *mmObj=[MinMax new]; 
     mmObj.minimum=myClassObj.minimum; 
     mmObj.maximum=myClassObj.maximum; 

     if ([_finalDict objectForKey:myClassObj.name]) { 
      NSMutableArray *getArray=[_finalDict objectForKey:myClassObj.name]; 
      [getArray addObject:mmObj]; 
     } 
     else{ 
      NSMutableArray *array=[NSMutableArray new]; 
      [array addObject:mmObj]; 
      [_finalDict setObject:array forKey:myClassObj.name]; 
     } 
    } 


    for (NSDictionary *dict in _finalDict) { 
     NSLog(@"%@",dict); 
     for (MinMax *mmObj in [_finalDict objectForKey:dict]) { 
      NSLog(@"%@, %@", mmObj.minimum, mmObj.maximum); 
     } 
    } 
} 

输出：

From server : Layer 1, 1, 30 
From server : Layer 1, 45, 60 
From server : Layer 2, 45, 60 
Layer 1 
1, 30 
45, 60 
Layer 2 
45, 60