CODEWITHSUNDEEP
iosnspredicatensmetadataquery
Fire Fist
Fire Fist

Reputation: 7050

NSPredicate predicateWithFormat for NSMetaDataQuery in iOS

I need to append my custom string into NSPredicate.

So I wrote following codes.

self.query = [[NSMetadataQuery alloc] init];
[self.query setSearchScopes: [NSArray arrayWithObject:NSMetadataQueryUbiquitousDocumentsScope]];

NSPredicate *pred = [NSPredicate predicateWithFormat:@"%K like '%@*'",NSMetadataItemFSNameKey,whereAreYou];

NSLog(@"%@",pred.description);

[self.query setPredicate:pred];

However when I test it , it only return following value.

kMDItemFSName LIKE "%@*"

the placeholder %@ is not append correctly. It only showing %@ sign.

How can I do that?

Upvotes: 1

Views: 595

Answers (1)

Martin R
Martin R

Reputation: 539685

Format arguments inside quotation marks are not expanded by predicateWithFormat, therefore @"%K like '%@*'" does not work.

This should work:

NSString *pattern = [NSString stringWithFormat:@"%@*", whereAreYou];
NSPredicate *pred = [NSPredicate predicateWithFormat:@"%K LIKE %@", NSMetadataItemFSNameKey, pattern];

Upvotes: 4

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