NSPredicate 不适用于 long long 值
NSPredicate doesn't work for long long values
我有像这样的简单谓词来从核心数据中获取所有代码对象:
let predicate = NSPredicate(format: "code.state != %@ AND code.validity != %d AND code.validity < %ld", "ACCEPTANCE", 0, Date().timeIntervalSince1970 * 1000)
现在里面 cellForRow
我正在打印我有的东西:
print("++++++++++")
print(product.code)
print(product.code?.state)
let a = product.code?.validity ?? 0
print(a)
print(Date().timeIntervalSince1970 * 1000)
print(Double(a) < Date().timeIntervalSince1970 * 1000)
然后我得到以下结果:
code.state != "ACCEPTANCE" AND code.validity != 0 AND code.validity < 4789427390557216924
++++++++++
aaa
Optional("PACKED")
1614253260000
1612447824663.5361
false
++++++++++
product test 5
Optional("PACKED")
1616880420000
1612447824672.909
false
++++++++++
Produkt testowy 1
Optional("UNPACKED")
1611788400000
1612447824678.4438
true
++++++++++
qqq
Optional("UNPACKED")
1612306800000
1612447824702.927
true
++++++++++
test phone 2
Optional("UNPACKED")
1612393200000
1612447824718.4958
true
如您所见,其中两个被打印为错误。那么为什么它们被提取而没有被提取?
问题是谓词中的 %ld
格式与参数类型(Double
)不匹配。您有以下选择:
%f
与 Double
,
%ld
与 Int
,
%@
加上 NSNumber
,这是最不容易出错的方法。
示例:
NSPredicate(format: "code.validity < %f", Date().timeIntervalSince1970 * 1000)
NSPredicate(format: "code.validity < %ld", Int(Date().timeIntervalSince1970 * 1000))
NSPredicate(format: "code.validity < %@", NSNumber(value: Date().timeIntervalSince1970 * 1000))
我有像这样的简单谓词来从核心数据中获取所有代码对象:
let predicate = NSPredicate(format: "code.state != %@ AND code.validity != %d AND code.validity < %ld", "ACCEPTANCE", 0, Date().timeIntervalSince1970 * 1000)
现在里面 cellForRow
我正在打印我有的东西:
print("++++++++++")
print(product.code)
print(product.code?.state)
let a = product.code?.validity ?? 0
print(a)
print(Date().timeIntervalSince1970 * 1000)
print(Double(a) < Date().timeIntervalSince1970 * 1000)
然后我得到以下结果:
code.state != "ACCEPTANCE" AND code.validity != 0 AND code.validity < 4789427390557216924
++++++++++ aaa Optional("PACKED") 1614253260000 1612447824663.5361 false ++++++++++ product test 5 Optional("PACKED") 1616880420000 1612447824672.909 false ++++++++++ Produkt testowy 1 Optional("UNPACKED") 1611788400000 1612447824678.4438 true ++++++++++ qqq Optional("UNPACKED") 1612306800000 1612447824702.927 true ++++++++++ test phone 2 Optional("UNPACKED") 1612393200000 1612447824718.4958 true
如您所见,其中两个被打印为错误。那么为什么它们被提取而没有被提取?
问题是谓词中的 %ld
格式与参数类型(Double
)不匹配。您有以下选择:
%f
与Double
,%ld
与Int
,%@
加上NSNumber
,这是最不容易出错的方法。
示例:
NSPredicate(format: "code.validity < %f", Date().timeIntervalSince1970 * 1000)
NSPredicate(format: "code.validity < %ld", Int(Date().timeIntervalSince1970 * 1000))
NSPredicate(format: "code.validity < %@", NSNumber(value: Date().timeIntervalSince1970 * 1000))