ios - PFQuery on Array for item starts with String -


i have array of search keywords field in custom object , wanna make search when user enter 2 or 3 characters of of array items example 

["cafe" , "food" , "eat"] ["car" , "gas"]

if user entered caf should return object contains search keyword

[query wherekey:@"keywords" greaterthan:keyword];

returns not relevant data returns 2 rows of car , cafe !

i tried equalto 

[query wherekey:@"keywords" equalto:keyword];

but row should enter whole word

any ideas should query on?


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