nspredicate

I have some pretty interesting logic going, basically I have this data which I want to check over before I display the next view.. just in case the data is empty I want to pop the view, if the data is not empty then I want to load the the view to display it onto the navigational stack. so in my tableView:didSelectRowAtIndexPath: method, when the selection is made I, get the current selection ID number so I can restrict the values of the data Im going to parse to only related values. This is what the code looks like inside my method. #pragma mark - Table view delegate - (void)tableView:

Newbie Questions, I have 3 Class, 3 of them are subclass from NSOBject. Collection Class , have 2 properties, masterSong as NSMutableSet (strong, nonatomic) and listOfPlaylists as NSMutableArray (strong, nonatomic) Playlist Class Have 2 properties, playListName as NSString (copy, nonatomic) and songList as NSMutableArray (strong, nonatomic) 3 . Song Class Have 4 properties: title,artist,album, playtime as NSString (copy, nonatomic). masterSong will contain Song object, and listOfPlaylist will contain Playlist Object. while songList only store reference to Song Object. I want to create

I have a Core Data project and am having difficulty searching the data with a simple calculated field and have no idea why it's not working. I have a Tutor entity, with core data string attributes "tutorFirstName" and "tutorLastName". I've created an additional string attribute "tutorFullName" which is populated in a Category as such: NSString *fullName = [@[self.tutorFirstName, self.tutorLastName] componentsJoinedByString:@" "]; The data is populated fine, but when I perform the following searches only the predicates on the tutorFirstName and tutorLastName work: NSPredicate *predicate =

I have viewed numerous predicate questions, I have read the docs and nothing seems to be jumping out as an answer my problem. I have a Core Data entity named Materials and I have the Attributes category , subcategory and description . I have three UITableViewControllers and in each I want to use a predicate to display as follows: TableViewController 1: Only the categories (no repeating of category names) Select a category and go to TableViewController 2. TableViewController 2: Display Subcategories (no repeating of subcategory names) Select a subcategory and go to TableViewController 3 listing

I am looking at the following type of data structure: { author = "Author 1"; channelIds = ( 7 ); }, { author = "Author 2"; channelIds = ( 7, 1 ); }, , { author = "Author 3"; channelIds = ( 3, 7 ); } I'd like to build an array consisting of all items where channeldIds = 7 . I was trying things along the lines of the following predicate: NSPredicate * filterById = [NSPredicate predicateWithFormat:@"channelIds[0] = '7'"]; How can I do what I'd like here? I can have an x number of channelIds, is there any way to iterate in the predicate? Tia, S. Easier: NSPredicate *filterById = [NSPredicate

I have a strange problem which I can't seem to solve on my own. Any help or thought is appreciated. The problem: NSMetadataQuery finds normal files (like test.txt) but no filewrapper bundle (myWrapperDocument.pro) However, NSFileManager finds all files in my ubiquity container - so the files are there, but NSMetadataQuery doesn't find them! The facts: UIDocument based app using NSFileWrappers Shared Ubiquity Container (for iOS and Desktop app) Works perfect on Mac OS Works perfect on my iPad Mini and my iPhone 4S and iPhone 3GS (running iOS6 and iOS5) Doesn't work on my iPad1 nor on most of my

I've got a short question. I have an NSArray filled with Cars (which inherits from NSObject). Car has the @property NSString *engine (also regarded @synthesize ) Now I want to filter the array using NSPredicate : predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"(engine like %@)", searchText]]; newArray = [ArrayWithCars filteredArrayUsingPredicate:predicate]; This throws an valueForUndefinedKey error. Is the predicateWithFormat correct? Thanks for your responses. Here's the real reason why it's not working: When you build a string using stringWithFormat: , it's going to