NSCompoundPredicate正在給出意想不到的結果

我必須承認我對謂詞相當陌生。我有一個表格，用戶填寫並根據這些信息，它應該搜索已保存的數據並返回相關結果。代碼爲：NSCompoundPredicate正在給出意想不到的結果

let numberOfPlayers = numberOfPlayersPicked 
    let minTimeForPredicate = minTime 
    let maxTimeForPredicate = maxTime 
    let gameTime = "averageplaytime" 
    let minPlayers = "minplayers" 
    let maxPlayers = "maxplayers" 
    let minPlayersPredicate = NSPredicate(format: "%K <= %D", minPlayers, numberOfPlayers) 
    let maxPlayersPredicate = NSPredicate(format: "%K >= %D", maxPlayers, numberOfPlayers) 
    let minTimePredicate = NSPredicate(format: "%K >= %D", gameTime, minTimeForPredicate) 
    let maxTimePredicate = NSPredicate(format: "%K <= %D", gameTime, maxTimeForPredicate) 
    let andPredicate = NSCompoundPredicate.init(andPredicateWithSubpredicates: [minPlayersPredicate, maxPlayersPredicate, minTimePredicate, maxTimePredicate])

numberOfPlayersPicked，minTime和maxTime來自上一個屏幕。當我感覺它返回錯誤信息時，例如numberOfPlayersPicked = 1，minTime = 120和maxTime = 999（時間由分段控件設置）。檢索到的數據有minplayers = 1，maxplayers = 2和averageplaytime = 60。我不確定它爲什麼檢索這個，顯然我完全誤解了一些東西！

編輯：我試圖打印一個負載的結果，看看我能否發現任何事情發生。

print(andPredicate) 
print(numberOfPlayers) 
print(minTimeForPredicate) 
print(maxTimeForPredicate) 
print(games[0]) 

minplayers <= 1 AND maxplayers >= 1 AND averageplaytime >= 0 AND averageplaytime <= 30 
1 
0 
30 
<NSManagedObject: 0x6100000a5640> (entity: GameInCollection; id: 0xd0000000003c0000 <x-coredata://31C3474F-7C40-4C47-AF2D-883A76F922C6/GameInCollection/p15> ; data: { 
averageplaytime = 150; 
barcode = ""; 
gametitle = "1 5 150"; 
maxplayers = 5; 
minplayers = 1; 
})

print statements

print results

來源

2016-10-04 LukeNobleUK

你存儲這些屬性字符串而不是整數？這可能是因爲你正在比較字符串值而不是真正的數值，這會產生這些意想不到的結果。

來源

2016-10-05 22:09:09 PhilBrooks

是的，這是它！我改變了我的核心數據保存爲存儲整數，所有似乎現在工作。 – LukeNobleUK

NSCompoundPredicate正在給出意想不到的結果

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