ios - nspredicate substitution not working -


hi trying use substitutions error

nspredicate *pred = [nspredicate predicatewithformat:                      @"city $c $a or "                      " state $c $a or "                      " name $c $a "]; // <-- crashes here pred = [pred predicatewithsubstitutionvariables:@{@"a":self.searchbar.text,                                                   @"c":@"contains[c]"}];

this sample code apples documentation on subject

nspredicate *predicate = [nspredicate     predicatewithformat:@"date = $date"]; predicate = [predicate predicatewithsubstitutionvariables:     [nsdictionary dictionarywithobject:[nsnull null] forkey:@"date"]];

i not sure doing wrong. simple want $a place holders replaced same string; in case self.searchbar.text

can tell me why doesn't work?

apparently can use substitution on variables.


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