Xcode NsPredicate

Xcode NsPredicate

Hello can someone help me with NSPredicate??
I'm trying to filter an array of objects like this:
{
"id": "0",
"title": "Crucifix and sarcophagus of Ariberto da Intimiano",
"categoryName": "COMMEMORATIVE MONUMENTS",
"audioFile": "Crucifix-and-sarcophagus-of-Ariberto-da-Intimiano",
"videoFile": null,
"textFile": "Crucifix-and-sarcophagus-of-Ariberto-da-Intimiano",
"image":
"content/0/Crucifix-and-sarcophagus-of-Ariberto-da-Intimiano_flow.jpg",
"numPictures": "1",
"didascalie": ["dida 1", "dida 2", "dida 3"],
"description": "Crucifix and sarcophagus of Ariberto da Intimiano",
"link": ""
},
{
"id": "1",
"title": "The sundial of Duomo",
"categoryName": "THE SUNDIAL",
"audioFile": "The-sundial-of-Duomo",
"videoFile": null,
"textFile": "The-sundial-of-Duomo",
"image": "content/1/The-sundial-of-Duomo_flow.jpg",
"numPictures": "2",
"didascalie": ["dida 1", "dida 2", "dida 3"],
"description": "The sundial of Duomo",
"link": ""
}
NSPredicate *key1Predicate = [NSPredicate predicateWithFormat:@"title ==
'%@'",_searchAZ.text];
_ArtWorksTableResults = [[_ArtWorksTable
filteredArrayUsingPredicate:key1Predicate] mutableCopy];
NSLog(@"%i",_ArtWorksTableResults.count);
When i perform the search the _ArtWorksTableResults.count is always 0.
But if i write the predicate instead of using the search bar text like this:
NSPredicate *key1Predicate = [NSPredicate predicateWithFormat:@"title ==
'The sundial of duomo'"];
_ArtWorksTableResults = [[_ArtWorksTable
filteredArrayUsingPredicate:key1Predicate] mutableCopy];
NSLog(@"%i",_ArtWorksTableResults.count);
The _ArtWorksTableResults.count is 1, that is correct!
What i did wrong?
I try also to log the search bar text and everything is ok.
I can't understand why if i write the key of search directly in the code
works!
Please help me!