NSPredicate不會在iOS 5中過濾長數據的數據

Question

我試圖使用NSPredicate從數組中過濾數據。 我陣列（arrLikes）包含以下來自服務器的數據

{ 
    "id":17, 
    "likes":[ 
     { 
     "likedBy": 
      { 
      "firstName":"Bob", 
      "lastName":"Builder", 
      "id":1 
      } 
     }], 
    "comments":[] 
} 

我想過濾來自陣列的數據，如低於

long loggedInUserId = [[dictUserInfo objectForKey:@"id"] longValue]; 
NSPredicate *likePredicate = [NSPredicate predicateWithFormat:@"id == %ld", loggedInUserId ]; 
NSArray *filteredLikeArray = [arrLikes filteredArrayUsingPredicate:likePredicate]; 

即使我的loggedInUserId是1，filteredLikeArray算retruns 0 什麼以上代碼錯誤？ 任何形式的幫助表示讚賞。謝謝。

Answer 1

您是否嘗試將長轉換爲NSString，如下所示？

long loggedInUserId = 17; 
NSString *stringUserId = [NSString stringWithFormat:@"%ld", loggedInUserId]; 
NSPredicate *likePredicate = [NSPredicate predicateWithFormat:@"id == %@", stringUserId]; 
NSArray *filteredLikeArray = [arrLikes filteredArrayUsingPredicate:likePredicate];