Filter CFArray using predicates like NSArray

Question

I'm trying to filter my contacts based on alphabets, something like this

NSArray *sectionArray = [contactAdd filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", [self.friendListSection objectAtIndex:section]]];

But here the problem is contactAdd is not a regular array its CFArray defined as

@property  CFArrayRef contactAdd;

So this code wont work, is there any alternative to use the above code for CFArray or any other solution to get the desired result??

Note:I dont want to change my contactAdd to regular array, I need to use CFArray only

score 4 · Accepted Answer · edited May 23 '17 at 12:03

4

NSArray *array = (NSArray *)CFBridgingRelease(self.contactAdd);
NSArray *sectionArray = [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", [self.friendListSection objectAtIndex:section]]];

Quoting the documentation (emphasis added)

CFArray is “toll-free bridged” with its Cocoa Foundation counterpart, NSArray. This means that the Core Foundation type is interchangeable in function or method calls with the bridged Foundation object. Therefore, in a method where you see an NSArray * parameter, you can pass in a CFArrayRef, and in a function where you see a CFArrayRef parameter, you can pass in an NSArray instance. This also applies to concrete subclasses of NSArray. See “Toll-Free Bridged Types” for more information on toll-free bridging.

Extra information about bridged casting: NSString to CFStringRef and CFStringRef to NSString in ARC?

edited May 23 '17 at 12:03

Community

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answered Sep 28 '13 at 06:09

Gabriele Petronella

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Its throwing error,NSLog(@"%@",array) displays ( "", "", "", so on) Error Message: 'NSInvalidArgumentException', reason: 'Can't do a substring operation with something that isn't a string (lhs = rhs = z)' – Francis F Sep 28 '13 at 06:22
Any advice, what is the reason? – Francis F Sep 28 '13 at 06:24
My guess is that the predicate is wrong. You are using `beginswith` on an object which is not a string. – Gabriele Petronella Sep 28 '13 at 06:25

Filter CFArray using predicates like NSArray

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