NSPredicate不使用詞典

Question

的陣列工作，我有一個NSPredication與格式是這樣的：@"Status CONTAINS[cd] shipped"

我有字典的數組，這裏有一個例子：

{ 
     { 
     Category = "Category 4"; 
     Comp = "Category 4"; 
     Depth = 02; 
     Grade = New; 
     Length = 02; 
     Location = "Thousand Oaks, CA"; 
     Name = "3ply Mat"; 
     Owner = "Owner 3"; 
     PUP = 2; 
     Status = Shipped; 
     "Unit Number" = 20110507113852351; 
     Width = 02; 
    }, 
     { 
     Category = "Category 4"; 
     Comp = "Category 4"; 
     Depth = 02; 
     Grade = New; 
     Length = 02; 
     Location = "Thousand Oaks, CA"; 
     Name = "3ply Mat"; 
     Owner = "Owner 3"; 
     PUP = 2; 
     Status = Shipped; 
     "Unit Number" = 20110516094641587; 
     Width = 02; 
    } 
) 

但它返回一個空數組。我究竟做錯了什麼？謝謝

Answer 1

您可以使用關鍵字MATCHES,CONTAINS等，對字符串。當狀態不是字符串，我想，你需要檢查它像這樣，

[NSPredicate predicateWithFormat:@"Status = %d", Shipped]; 

Answer 2

你想：

[NSPredicate predicateWithFormat:@"Status =[cd] 'shipped'"]; 

或者：

[NSPredicate predicateWithFormat:@"Status =[cd] %@", @"shipped"]; 

你的問題是，你的謂詞格式有shipped，當它應該有'shipped'。沒有單引號意味着它試圖比較[dictionary valueForKey:@"Status"]到[dictionary valueForKey:@"shipped"]，而不是字符串文字@"shipped"。