UIView *vieww =[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
[vieww addSubview:yourBtn1];
[vieww addSubview:yourBtn2];

[self.navigationController.navigationBar addSubview:vieww];    

如果你想删除yourButtonView，那么make是全局对象;

And if you want to remove yourButtonView then make is global object;

in .h

UIView *vieww;

和 .m

-(void)viewWillDisappear:(BOOL)animated
{
    [vieww removeFromSuperview];
}

或者按照此更多链接