Question

It raises an exception when I enter more than two characters in the searchfield. I use NSComparisonResult to show results on a UITableView:

- (void)filterContentForSearchText:(NSString*)searchText
{

for (mystring in self.array)
{

NSComparisonResult result = [mystring compare:searchText options:(NSCaseInsensitiveSearch) 
range:NSMakeRange(0, [searchText length])];

if (result == NSOrderedSame)
        {   
            NSUInteger index=[self.array indexOfObjectIdenticalTo:mystring]; 
            NSUInteger maxindex = index + 50;
            for (index ; (index < [self.array count] && index <= maxindex && index!= NSNotFound); index ++)
            {   
                [self.filteredListContent addObject:[NSDictionary dictionaryWithObjectsAndKeys:[self.array objectAtIndex:index],@"english",[self.secondarray objectAtIndex:index],@"translated",nil]];  
            }
            break;
        }
}

The output shows:

 -[UIDeviceWhiteColor compare:options:range:]: unrecognized selector sent to instance 0x5e4a5d0
2011-11-06 12:10:51.932 XXX[2583:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIDeviceWhiteColor compare:options:range:]: unrecognized selector sent to instance 0x5e4a5d0'

What does UIDeviceWhiteColor in this case mean?

---

self.array = [[NSArray alloc] initWithArray:
           [[NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"first" ofType:@"txt"]
                                      encoding:NSUTF8StringEncoding error:NULL] componentsSeparatedByString:@"\n"]];

self.secondarray = [[NSArray alloc] initWithArray:
           [[NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"second" ofType:@"txt"]
                                      encoding:NSUTF8StringEncoding error:NULL] componentsSeparatedByString:@"\n"]];

Answer 1

That’s because there is a UIDeviceWhiteColor somewhere in your self.array, which should be made of just NSStrings. How do you populate this array?