在UINavigationController的导航栏中增添UISegmentedControl

在UINavigationController的导航栏中添加UISegmentedControl
UISegmentedControl *segmentedControl=[[UISegmentedControl alloc] initWithFrame:CGRectMake(80.0f, 8.0f, 200.0f, 30.0f) ];
    [segmentedControl insertSegmentWithTitle:@"Food to eat" atIndex:0 animated:YES];
    [segmentedControl insertSegmentWithTitle:@"Food to avoid" atIndex:1 animated:YES];
    segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
    segmentedControl.momentary = YES;
    segmentedControl.multipleTouchEnabled=NO;
    [segmentedControl addTarget:self action:@selector(Selectbutton:) forControlEvents:UIControlEventValueChanged];
    UIBarButtonItem *segButton = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];
    [segmentedControl release];
    self.navigationItem.rightBarButtonItem = segButton;
    [segButton release];