IOS 导航栏上的基本控件

// 分段控件

    UISegmentedControl *segmentC=[[UISegmentedControl alloc]initWithItems:@[@"消息",@"电话"]];
    segmentC.w=120;
    segmentC.selectedSegmentIndex=0;
    self.navigationItem.titleView=segmentC;

//搜索栏

    UISearchBar *sB=[[UISearchBar alloc]initWithFrame:CGRectMake(0,0,[UIScreen mainScreen].bounds.size.width,44)];
    [sB setPlaceholder:@"搜索"];
    [self.tableView addSubview:sB];