make an imageView move in objective-c -

i'm trying make bird jump pressing button. have not idea how that. created timer don't know how use that.

int birdflight;  @interface birdviewcontroller : uiviewcontroller {      iboutlet uibutton *flybutton;     iboutlet uiimageview *bird;      nstimer *birdmovement;  }  -(ibaction)buttonbirdfly:(id)sender;   @end 

how use method?

    @implementation birdviewcontroller      -(ibaction)buttonbirdfly:(id)sender     {       }