nspredicate

Refactored to vanilla UIViewController Rather than having the UITableView toggle between active and inactive UISearchController , I refactored to a vanilla UIViewController with a UISearchBar at the top and a UITableView directly underneath it. What I'm trying to do is toggle the fetchedResultsController between having a predicate which is set by the text in the searchBar and one that grabs everything. I found this answer, which describes a solution to a similar problem in Objective-C and served as the basis upon which I refactored my Swift project: How to filter NSFetchedResultsController

I have setup Core Data for an iPhone app without an instance of NSFetchedResultsController. To do this, I created a created a model class to encapsulate all core data requests and constructing of NSFetchRequests/NSPredicates. This kept all Core Data specific code out of my UITableViewController. Now I want to add NSFetchedResultsController to make populating a sectioned UITableView easier. My issue is this: In all examples I have seen the instance NSFetchedResultsController is an ivar of the UITableViewController. This leads to all NSFetchedResults statements constructed within the

This may sounds silly, but here is the data to predicate: @interface Person @property NSString *name; @property NSString *phone; @property NSString *address; @end I got an NSPredicate that will search through Person Array, search by Name. Normally, I will use it like NSPredicate *predicate1 = [NSPredicate predicateWithFormat:@"name contains[c] %@", searchText]; But how can I use the key (name) as a parameter? Like NSString *key = @"name"; NSPredicate *predicate2 = [NSPredicate predicateWithFormat:@"%@ contains[c] %@", key, searchText]; The predicate1 works fine, but the predicate2 doesn't. The

I'm using following NSPredicate for filtering, NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(firstName CONTAINS %@ ) OR (lastName CONTAINS %@ )OR (UserName CONTAINS %@ ) ", myText,myText,myText]; NSArray *filtered = [responseArray filteredArrayUsingPredicate:predicate]; It works fine, but it's case-sensitive. I need the filtering should be case insensitive. I've tried, NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(ANY firstName CONTAINS %@ ) OR (ANY lastName CONTAINS %@ )OR (ANY UserName CONTAINS %@ ) ", myText,myText,myText]; But it throws the error ***

I can't see any problem with these line of code. Why can't it parse? [NSPredicate predicateWithFormat:@"(username CONTAINS[cd] %1$@) || " "(userId CONTAINS[cd] %1$@) || " "(firstname CONTAINS[cd] %1$@) || " "(lastname CONTAINS[cd] %1$@)", searchString]" The Log doesn't help either. Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unable to parse the format string "(username CONTAINS[cd] %1$@) || (userId CONTAINS[cd] %1$@) || (firstname CONTAINS[cd] %1$@) || (lastname CONTAINS[cd] %1$@)"' Edit 1: Okay, it seems like predicateWithFormat doesn't understand "%1$@".