simplified button animation

gistfile1.m

- (IBAction)btn_reg_onClick:(id)sender {       
    reg_animation_modus = !(reg_animation_modus);
    int k;
    if( reg_animation_modus ){ 
    	k = 1; 
        [btn_einloggen setTitle:@"Registrieren" forState:UIControlStateNormal];
    } else {
    	k = -1;
        [btn_einloggen setTitle:@"Einloggen" forState:UIControlStateNormal];
    }
    
    [UIView animateWithDuration:1.0 animations:^{
        CGRect frame    = btn_einloggen.frame;
        frame.origin.y += key_max_reg_animation_count * k;
        btn_einloggen.frame = frame;
        
        frame           = tf_pw_r.frame;
        frame.origin.x  += (key_max_reg_animation_count*30) * k;
        tf_pw_r.frame   = frame; 
    }];
}