ios 导航条添加多个按钮

    UIButton *informationCardBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [informationCardBtn addTarget:self action:@selector(RightBtnCLick:) forControlEvents:UIControlEventTouchUpInside];
    [informationCardBtn setImage:[UIImage imageNamed:@"nav_information"] forState:UIControlStateNormal];
    
    [informationCardBtn sizeToFit];
    UIBarButtonItem *informationCardItem = [[UIBarButtonItem alloc] initWithCustomView:informationCardBtn];
    
    
    UIBarButtonItem *fixedSpaceBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    fixedSpaceBarButtonItem.width = 22;
    
    
    UIButton *settingBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [settingBtn addTarget:self action:@selector(RightBtnCLick:) forControlEvents:UIControlEventTouchUpInside];
    [settingBtn setImage:[UIImage imageNamed:@"nav_settings"] forState:UIControlStateNormal];
    [settingBtn sizeToFit];
    UIBarButtonItem *settingBtnItem = [[UIBarButtonItem alloc] initWithCustomView:settingBtn];
    
    
    
    self.navigationItem.rightBarButtonItems  = @[informationCardItem,fixedSpaceBarButtonItem,settingBtnItem];