NSCompoundPredicate给出了意想不到的结果

Question

我必须承认，我对谓词非常陌生。我有一个表单，用户填写，并根据这些信息，它应该搜索保存的数据，并返回相关的结果。这方面的代码是：

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。当我感觉返回错误信息时，一个例子是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和平均播放时间= 60。我不知道它为什么要收回这个，显然我完全误解了一些东西！

编辑:我已经尝试打印了大量的结果，看看我是否能发现发生的任何事情。

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;
})

打印语句

打印结果

Answer 1

您是否将这些属性存储为字符串而不是整数？这可能是因为您正在对字符串值进行比较，而不是对它们的真正数值进行比较，这会产生这些意想不到的结果。