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What I want to do is to return the NSArray objects of a specific value (numbers). How can I do it?

Thanks in Advance

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return @[ 1, 2, 42, 1337 ]; –  user529758 Jun 14 '13 at 22:29
    
And where's the question about Xcode? –  user529758 Jun 14 '13 at 22:29
    
@H2CO3, those need to be NSNumber literals. –  Matt Wilding Jun 14 '13 at 22:36
    
@MattWilding Correct, thanks, of course. Maybe I should go to bed. –  user529758 Jun 14 '13 at 22:38

1 Answer 1

up vote 0 down vote

You can use indexesOfObjectsPassingTest: on your NSArray instance.

NSArray *array = @[1, 2, 3];

typedef BOOL (^Predicate)(id obj, NSUInteger idx, BOOL *stop);
Predicate predicate = ^(id obj, NSUInteger idx, BOOL *stop) {
    if ([obj isKindOfClass:[NSNumber class]]) {
        *stop = YES;
        return YES;
    } else return NO;
};

NSIndexSet *indexes = [array indexesOfObjectsPassingTest:predicate];

https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSArray_Class/NSArray.html#//apple_ref/doc/uid/20000137-SW24

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Thank you, but what I need (I did not explain it properly)is, for example,return any type of number –  Alrro Jun 16 '13 at 15:34
    
@Alrro I updated the answer. You can probably use isKindOfClass: or you might have to write a more exhaustive test, but the mechanism is the same. –  trdarr Jun 17 '13 at 22:33

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