NSCompoundPredicate正在给出意想不到的结果

我必须承认我对谓词相当陌生。我有一个表格，用户填写并根据这些信息，它应该搜索已保存的数据并返回相关结果。代码为：NSCompoundPredicate正在给出意想不到的结果

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来自上一个屏幕。当我感觉它返回错误信息时，例如numberOfPlayersPicked = 1，minTime = 120和maxTime = 999（时间由分段控件设置）。检索到的数据有minplayers = 1，maxplayers = 2和averageplaytime = 60。我不确定它为什么检索这个，显然我完全误解了一些东西！

编辑：我试图打印一个负载的结果，看看我能否发现任何事情发生。

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

来源

2016-10-04 LukeNobleUK

你存储这些属性字符串而不是整数？这可能是因为你正在比较字符串值而不是真正的数值，这会产生这些意想不到的结果。

来源

2016-10-05 22:09:09 PhilBrooks

是的，这是它！我改变了我的核心数据保存为存储整数，所有似乎现在工作。 – LukeNobleUK

NSCompoundPredicate正在给出意想不到的结果

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