How to concatenate two column values and compare in ios - ios

Question

In my entity Contact, I have two columns named firstName & lastName. I want to search for a name entered by user in my DB.
For Eg: If user enters only 'William' I can search either its present in first name or last name and show the result.
If the user enters 'William Smith', then I want to get both first name and last name from DB and compares it with search text.
For this i want to use NSPredicate that compares 3 condition:
firstName contains the search text OR
lastName contains the search text OR
firstName+lastName contains the search text.
I used the following predicate for that:
NSString *strSearchType = #"(%# CONTAINS[cd] '%#' OR %# CONTAINS[cd] '%#' OR (%# || %# CONTAINS[cd] '%#')";
I know "||" is the concatenate operator.
But it gives me the following exception:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unable to parse the format string "(firstName CONTAINS[cd] 'rus' OR lastName CONTAINS[cd] 'rus' OR ((firstName || lastName) CONTAINS[cd] 'rus'))"'
Am i doing anything wrong ?

Answer 1

You can try following :
firstName contains the search text OR
lastName contains the search text OR
(search text contains the firstName AND search text contains the lastName).

Answer 2

NSString* stringA=nil; NSString* stringB=nil;
// this would give array of string separated by space
NSArray *searchStrArray = [searchString componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:#" "]];
if (searchStrArray.count>0) {
stringA=[searchStrArray objectAtIndex:0];
}
if (searchStrArray.count>1) {
stringB=[searchStrArray objectAtIndex:1];
}
NSPredicate* predicateA= [NSPredicate predicateWithFormat:#“firstName CONTAINS[c] %# OR lastName CONTAINS[c] %#",stringA , stringA];
NSPredicate* resultPredicate=predicateA;
if(stringB){
NSPredicate* predicateB= [NSPredicate predicateWithFormat:#“firstName CONTAINS[c] %# OR lastName CONTAINS[c] %#",stringB , stringB];
resultPredicate=[NSCompoundPredicate andPredicateWithSubpredicates:[NSArray arrayWithObjects:resultPredicate,predicateB, nil]];
}