與JSON相比，以相反的順序獲取數據

Question

試圖獲取下面的json，它的所有標記都是動態的，而不是固定的。

{ 
Level1: { 
row1: { 
1: "on", 
2: "off", 
3: "off", 
4: "on", 
5: "on", 
6: "on", 
7: "on", 
8: "on", 
9: "on", 
10: "on", 
11: "on", 
12: "on", 
13: "on", 
14: "on", 
15: "on", 
16: "on", 
17: "on", 
18: "on", 
19: "on", 
20: "on", 
attr: { 
total: "20", 
type: "Gold" 
} 
}, 
row10: { 
1: "on", 
2: "on", 
3: "on", 
4: "on", 
5: "on", 
6: "on", 
7: "on", 
8: "on", 
9: "on", 
10: "on", 
11: "on", 
12: "on", 
13: "on", 
14: "on", 
15: "on", 
16: "on", 
17: "on", 
18: "on", 
19: "on", 
20: "on", 
attr: { 
total: "20", 
type: "Bronze" 
} 
} 
}, 
Level3: { 
row1: { 
1: "on", 
2: "on", 
3: "on", 
4: "on", 
5: "on", 
6: "on", 
7: "on", 
8: "on", 
9: "on", 
10: "on", 
11: "on", 
12: "on", 
13: "on", 
14: "on", 
15: "on", 
16: "on", 
17: "on", 
18: "on", 
19: "on", 
20: "on", 
attr: { 
total: "20", 
type: "Gold" 
} 
}, 
row5: { 
1: "on", 
2: "on", 
3: "on", 
4: "on", 
5: "on", 
6: "on", 
7: "on", 
8: "on", 
9: "on", 
10: "on", 
11: "on", 
12: "on", 
13: "on", 
14: "on", 
15: "on", 
16: "on", 
17: "on", 
18: "on", 
19: "on", 
20: "on", 
attr: { 
total: "20", 
type: "Bronze" 
} 
} 
} 
} 

這是我到目前爲止所嘗試的。

NSString *level; 
for(NSString *key in [[self.mGetDataDict allKeys]sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)]) 
{ 
    NSLog(@"Accessing .... %@",key); 
    level = key; 

    for(NSString *rowKey in self.mGetDataDict[key]) 
    { 
     [arrayLevels addObject:level]; 

     NSLog(@"%@",rowKey); 
     [arrRows addObject:rowKey]; 
     for(NSString *valueKey in self.mGetDataDict[key][rowKey]) 
     { 
      // NSLog(@"%@ -> %@",valueKey,self.mGetDataDict[key][rowKey][valueKey]); 
      if([valueKey isEqualToString:@"attr"]) 
      { 
       dictRow = self.mGetDataDict[key][rowKey][valueKey]; 
      } 
      else{ 
       //dictRow = self.mGetDataDict[key][rowKey][valueKey]; 
       [arrSeatsStatus addObject:self.mGetDataDict[key][rowKey][valueKey]]; 
      } 
     } 
     NSLog(@"--------ROW OVER------------%@\n", dictRow); 
     [arrSeats addObject:[dictRow valueForKey:@"total"]]; 
     NSString *strTypes = [NSString stringWithFormat:@"%@ %@", [arrayLevels objectAtIndex:i], [dictRow valueForKey:@"type"]]; 
     [arrTypes addObject:strTypes]; 

      NSMutableArray *array = [NSMutableArray array]; 
      array = [arrSeatsStatus copy]; 
      [seatsDict setObject:array forKey:[NSString stringWithFormat:@"%d",i]]; 
      i++; 
      [arrSeatsStatus removeAllObjects]; 

     NSLog(@"--------seats dict------------%@\n", seatsDict); 

     NSLog(@"--------seats in row------------%@\n", arrSeats); 
     // NSLog(@"--------seats status------------%@\n", arrStatus); 
     NSString *row = [NSString stringWithFormat:@"%@",[arrSeats objectAtIndex:0]]; 
     rows = [row integerValue]; 
    } 
    NSString *num = [arrSeats valueForKeyPath: @"@sum.self"]; 
    tot = [num integerValue]; 
    [arrTot addObject:[NSString stringWithFormat:@"%d",tot]]; 
    tot = 0; 
    //[arrSeats removeAllObjects]; 
    NSLog(@"--------ROW OVER tot seats------------%@\n", arrTot); 
    NSLog(@"--------------------seats:%@\n", num); 
    NSLog(@"--------------------\n"); 
} 

問題是，當數據提取時，它不是來自JSON。例如，當上面的代碼運行時，它首先獲取level2，然後row2以某種順序進一步進入，但不是如上所示的順序進行。希望我說清楚。請指導以上。提前致謝。

Answer 1

例如，更換

for(NSString *rowKey in self.mGetDataDict[key]) 

與

NSDictionary *rowDict = self.mGetDataDict[key]; 
for (NSString *rowKey in rowDict) 

（雖然儘量想一個更具描述性的名稱爲 「rowDict」）

是的，它更多的字符，但在以後的你可以參考rowDict[something]行，也許以後仍然valueDict[something]而不是長索引鏈。更高效和更容易保持直線。

Answer 2

我完全同意熱舔，它是真的很複雜，遵循你的代碼和你的問題的想法:)據我所知，你問，爲什麼你沒有你的鑰匙排序方式在json中。

你用來獲取它們的工具是將你的json轉換成NSDictionary，而NSDictionary不保證這些鍵以任何方式被排序，或者保留在它們被放置的位置。因此，您正在使用比較器 - @selector（caseInsensitiveCompare :)以某種方式對鍵進行排序。

所以答案應該是： 如果你想的鑰匙，複雜的方式（「離開的命令，因爲它是在JSON」不能由自己完成排序，你必須做到從檢索鍵時NSDictionary），你必須實現你自己的比較器。這是代替caseInsensitiveCompare：你必須使用你的自定義選擇器。你可以找到的例子in great amount around stackoverflow

希望這會有所幫助。