iOS 自定義NavigationBar右側按鈕rightBarButtonItem--button

//兩個按鈕的父類view
    UIView *rightButtonView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];
//歷史瀏覽按鈕
    UIButton *historyBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
    [rightButtonView addSubview:historyBtn];
    [historyBtn setImage:[UIImage imageNamed:@"button_history"] forState:UIControlStateNormal];
    [historyBtn addTarget:self action:@selector(historyBtnEvent) forControlEvents:UIControlEventTouchUpInside];
    
    //主頁搜索按鈕
    UIButton *mainAndSearchBtn = [[UIButton alloc] initWithFrame:CGRectMake(50, 0, 50, 50)];
    [rightButtonView addSubview:mainAndSearchBtn];
    [mainAndSearchBtn setImage:[UIImage imageNamed:@"button_filter-"] forState:UIControlStateNormal];
    [mainAndSearchBtn addTarget:self action:@selector(mainAndSearchBtnEvent) forControlEvents:UIControlEventTouchUpInside];
     
    //把右側的兩個按鈕添加到rightBarButtonItem
    UIBarButtonItem *rightCunstomButtonView = [[UIBarButtonItem alloc] initWithCustomView:rightButtonView];
    self.navigationItem.rightBarButtonItem = rightCunstomButtonView;