NSPredicate check for kind of object class

Question

I have an array of UIView objects. I want to call - (NSArray *)filteredArrayUsingPredicate:(NSPredicate *)predicate on this array to get array of MyCustomView objects.

How to code predicate with "isKindOf:"?

score 52 · Accepted Answer · edited May 16 '17 at 09:05

52

Try (depracated)

[NSPredicate predicateWithFormat: @"className == %@", [someObject className]]

Or

[NSPredicate predicateWithFormat: @"class == %@", [someObject class]]

edited May 16 '17 at 09:05

Jakub

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answered Nov 09 '11 at 13:47

Jef

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Works with `className` too for me. Though `class` looks cleaner. – Jef Nov 09 '11 at 14:17
What is more appropriate? "=" or "LIKE"? – user500 Nov 09 '11 at 14:37
When using like, `?` and `*` can be used as wildcard characters. http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Predicates/Articles/pSyntax.html – Jef Nov 09 '11 at 15:02
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Surely this predicate would be the equivalent of `isMemberOfClass:`, not `isKindOfClass:` as per the original question? – Tommy Feb 15 '12 at 20:41
I haven't tested this but you could always call `super` in the predicate and compare to that. – Jef Feb 17 '12 at 17:25
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As @Tommy says, this is not the right answer to the question as stated. The right answer is given below by zekel. – skagedal Jul 01 '16 at 08:26
Right, this would be isMemberOfClass, rather than isKindOfClass. That said, I'm glad this answer is here, because using className could be the only workable solution if the class isn't actually available (e.g. cross-process calls). So thanks for that answer. – dgatwood Apr 19 '22 at 17:53

score 30 · Answer 2 · edited May 23 '17 at 12:02

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I got errors using Jef's method. This worked for me, though.

NSPredicate *predicate = [NSPredicate predicateWithFormat:
                                              @"self isKindOfClass: %@", class];

Source: https://stackoverflow.com/a/2556306/168594

edited May 23 '17 at 12:02

Community

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answered Jul 27 '12 at 18:53

zekel

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score 0 · Answer 3 · answered Jan 14 '22 at 11:36

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For anyone interested, here is the Swift version of Jef's Method:

NSPredicate(format: "className = %@", String(describing: MyCustomView.self))

answered Jan 14 '22 at 11:36

Maximilian

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score -2 · Answer 4 · answered Nov 09 '11 at 13:50

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How about using -className as your key?

NSPredicate* foo = [NSPredicate predicateWithFormat: @"className == %@", @"MyCustomView"];

answered Nov 09 '11 at 13:50

JeremyP

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NSPredicate check for kind of object class

4 Answers4

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