iphone - Error: Parameter name omitted -

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i'm trying have auto reversing animation, , getting above error on "completion:^(bool)finished{" line.

            [uiview animatewithduration:0.5                                delay:0                             options:uiviewanimationoptionautoreverse                          animations:^{                              [[[self diebuttons] objectatindex:i] settransform:cgaffinetransformmaketranslation(0, 200)];                          }                          completion:^(bool)finished{                           }];

note first attempted following code button jumped new location @ end of animation.

        [uiview beginanimations:nil context:nil];         [uiview setanimationduration:0.5];         [uiview setanimationrepeatautoreverses:yes];         [button settransform:cgaffinetransformmaketranslation(0, 200)];         [uiview commitanimations];

finished name of bool parameter, , objective-c blocks have c-style function signatures, has in parentheses.

the block's signature supposed this:

^(bool finished) { }

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