如何通過陣列

Question

現在我遍歷一個數組循環一次和計算距離是這樣的：

- (void)calculateDistance 
{ 

    ann = [dict objectForKey:@"Blue"]; 


     for(int i = 0; i < [ann count]; i++) { 


      NSString *coordinates = [[ann objectAtIndex:i] objectForKey:@"Coordinates"]; 

      double realLatitude = [[[coordinates componentsSeparatedByString:@","] objectAtIndex:1] doubleValue]; 
      double realLongitude = [[[coordinates componentsSeparatedByString:@","] objectAtIndex:0] doubleValue]; 

      // Calculating distance 
      CLLocation *pinLocation = [[CLLocation alloc] 
               initWithLatitude:realLatitude 
               longitude:realLongitude]; 

      CLLocation *userLocation = [[CLLocation alloc] 
               initWithLatitude:mapView.userLocation.coordinate.latitude 
               longitude:mapView.userLocation.coordinate.longitude]; 

      CLLocationDistance distance = [pinLocation distanceFromLocation:userLocation]; 


      // Adding distance to dictionaries 
      if (distance > 1000) { 
      NSString *dist = [NSString stringWithFormat:@"%.2f km.", distance/1000]; 
      NSMutableDictionary *inDict = [[NSMutableDictionary alloc] init]; 
      inDict = [ann objectAtIndex:i]; 
      [inDict setValue:dist forKey:@"Distance"]; 
      } 
      else{ 
      NSString *dist = [NSString stringWithFormat:@"%4.0f m.", distance]; 
      NSMutableDictionary *inDict = [[NSMutableDictionary alloc] init]; 
      inDict = [ann objectAtIndex:i]; 
      [inDict setValue:dist forKey:@"Distance"]; 
      } 


     } 

} 

我的數據結構爲：

如何通過所有陣列的在循環一旦？我有數組，它包含我所有的Array的命名爲 「resultArray」，但是這個代碼不工作：

ann = [dict objectForKey:resultArray]; 

的NSLog（@ 「％@」，resultArray）;

2013-05-05 10:57:03.643 testApp[5708:907] (
    Black, 
    Green, 
    Orange, 
    Blue, 
    Darkblue 
) 

Answer 1

我想你想通過存儲在resultArray中的鍵枚舉並計算距離並將計算值添加到它。

- (void)calculateDistance 
{ 
    //Enumerates through resultArray 
    for (NSString *key in resultArray) { 

     //ann array is considered as an instance of NSMutableArray 

     ann = dict[key]; 

     for(int i = 0; i < [ann count]; i++) { 

      NSMutableDictionary *inDict = [ann[i] mutableCopy]; 

      NSString *coordinates = inDict[@"Coordinates"]; 

      NSArray *coordinateComponents = [coordinates componentsSeparatedByString:@","]; 

      double realLatitude = [coordinateComponents[1] doubleValue]; 
      double realLongitude = [coordinateComponents[0] doubleValue]; 

      // Calculating distance 
      CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:realLatitude 
                   longitude:realLongitude]; 

      CLLocation *userLocation = [[CLLocation alloc] 
             initWithLatitude:mapView.userLocation.coordinate.latitude 
             longitude:mapView.userLocation.coordinate.longitude]; 

      CLLocationDistance distance = [pinLocation distanceFromLocation:userLocation]; 


      // Adding distance to dictionaries 
      if (distance > 1000) { 
       NSString *dist = [NSString stringWithFormat:@"%.2f km.", distance/1000]; 
       [inDict setValue:dist forKey:@"Distance"]; 
      } 
      else{ 
       NSString *dist = [NSString stringWithFormat:@"%4.0f m.", distance]; 
       [inDict setValue:dist forKey:@"Distance"]; 
      } 
      //Inserting the modified values to the main array 
      [ann replaceObjectAtIndex:i withObject:inDict]; 

     } 

    } 

} 

Answer 2

ann = [dict objectForKey:resultArray]; 

for(NSArray *colourArray in ann) 
{ 
    for(NSDictionary *itemDictionary in colourArray) 
    { 
     NSLog(@"Coordinates = %@",[itemDictionary objectForKey:@"Coordinates"]); 

     NSLog(@"Name = %@",[itemDictionary objectForKey:@"Name"]); 

     NSLog(@"Address = %@",[itemDictionary objectForKey:@"Address"]); 
    } 
} 

希望它會幫助你。