ios - NSArray indexOfObject returning nil -


any idea why can't index of object i'm sure exist in array? instead, i'm getting nil.. 

(lldb) po newitem <receiptitem: 0x16a428b0>  (lldb) po self.items <__nsarraym 0x169bf0e0>( <receiptitem: 0x16a428b0> )  (lldb) po [self.items indexofobject:newitem] <nil>

thanks

-indexofobject: returns integer of type nsuinteger, not object reference. therefore should not use po (print object) debugger command, p.

it returns 0, not nil, means found object @ first position of array. if not find object, -indexofobject: return nsnotfound.

the lowest index corresponding array value equal anobject. if none of objects in array equal anobject, returns nsnotfound.


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