IOS添加多个按钮在导航栏

 UIView *customView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 75.0f, 30.0f)];

        UIButton *editorCityBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [editorCityBtn setFrame:CGRectMake(0.0f, 0.0f, 30.0f, 30.0f)];
        [editorCityBtn setBackgroundImage:MF_PngWithSkin(@"Defaults", @"other60.png") forState:UIControlStateNormal];
        [editorCityBtn addTarget:self action:@selector(editorCityBtnClick:) forControlEvents:UIControlEventTouchUpInside];
        [customView addSubview:editorCityBtn];

        UIButton *addCityBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [addCityBtn setFrame:CGRectMake(35.0f, 0.0f, 30.0f, 30.0f)];
        [addCityBtn setBackgroundImage:MF_PngWithSkin(@"Defaults", @"ico_promotion43x42.png") forState:UIControlStateNormal];
        [addCityBtn addTarget:self action:@selector(addCityBtnClick:) forControlEvents:UIControlEventTouchUpInside];
        [customView addSubview:addCityBtn];

        UIBarButtonItem *rightBtn = [[UIBarButtonItem alloc] initWithCustomView:customView];
        [self.navigationItem setRightBarButtonItem:rightBtn];