//两个按钮的父类view    UIView *rightButtonView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];//历史浏览按钮    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];        //主页搜索按钮    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];         //把右侧的两个按钮添加到rightBarButtonItem    UIBarButtonItem *rightCunstomButtonView = [[UIBarButtonItem alloc] initWithCustomView:rightButtonView];    self.navigationItem.rightBarButtonItem = rightCunstomButtonView;