objective-c 不区分大小写的核心数据 CONTAINS 或 BEGINSWITH 约束
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Case Insensitive Core Data CONTAINS or BEGINSWITH contraint
提问by aussiegeek
I have a predicate that looks like
我有一个看起来像的谓词
[NSPredicate predicateWithFormat:@"region=%@ && locality CONTAINS %@", self.region, query];
[NSPredicate predicateWithFormat:@"region=%@ && locality CONTAINS %@", self.region, query];
I want it to match ignoring case. Whats the trick?
我希望它匹配忽略大小写。有什么诀窍？
采纳答案by aussiegeek
Turns out I need to have a predicate in the form of:
原来我需要有一个形式为的谓词：
[NSPredicate predicateWithFormat:@"region=%@ && locality CONTAINS[cd] %@", self.region, query]
[NSPredicate predicateWithFormat:@"region=%@ && locality CONTAINS[cd] %@", self.region, query]
and now it is case insensitive
现在不区分大小写
回答by Barry Wark
As described in the Predicate Programming Guide, string comparisons in an NSPredicatecan be made case insensitive by including a [c](in square brackets) after the comparison operator (e.g. BEGINSWITH[c]). You can make the comparison diacritic insensitive using a [d]modifier or case and diacritic insensitive with a [cd]modifier. In your example, you would use:
如Predicate Programming Guide 中所述，NSPredicate通过[c]在比较运算符（例如BEGINSWITH[c]）之后包含 a （在方括号中），可以使an 中的字符串比较不区分大小写。您可以使用[d]修饰符使比较变音符号不敏感，或者使用修饰符使变音符号不敏感[cd]。在您的示例中，您将使用：
[NSPredicate predicateWithFormat:@"region=%@ && locality CONTAINS[cd] %@", self.region, query]
for case and diacritic insensitivity.
对于大小写和变音符号不敏感。
