iOS 自定义NavigationBar右侧按钮rightBarButtonItem--button

//两个按钮的父类view
    UIView *rightButtonView = [[UIView alloc] initWithFrame:CGRectMake(, , , )];
//历史浏览按钮
    UIButton *historyBtn = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];
    [rightButtonView addSubview:historyBtn];
    [historyBtn setImage:[UIImage imageNamed:@"button_history"] forState:UIControlStateNormal];
    [historyBtn addTarget:self action:@selector(historyBtnEvent) forControlEvents:UIControlEventTouchUpInside];

    //主页搜索按钮
    UIButton *mainAndSearchBtn = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];
    [rightButtonView addSubview:mainAndSearchBtn];
    [mainAndSearchBtn setImage:[UIImage imageNamed:@"button_filter-"] forState:UIControlStateNormal];
    [mainAndSearchBtn addTarget:self action:@selector(mainAndSearchBtnEvent) forControlEvents:UIControlEventTouchUpInside];

    //把右侧的两个按钮添加到rightBarButtonItem
    UIBarButtonItem *rightCunstomButtonView = [[UIBarButtonItem alloc] initWithCustomView:rightButtonView];
    self.navigationItem.rightBarButtonItem = rightCunstomButtonView;