如何在UINavigationBar中添加UISegmentedControl？

Question

我尝试将UISegmentedControl添加到UINavigationBar的底部并添加标题。但是我无法添加它，我无法在UISegmentedControl中添加tableView.headerView，因为我需要tableView.headerView中的搜索栏，因此我只需添加一个解决方案{{1 } {到} UISegmentedControl的底部。任何人都有另一种想法，我可以解决这种情况吗？

以下是我尝试过的代码（使用 Swift ）：

UINavigationBar

Answer 1

要把它放在navigationBar中，左边有一个标题视图，这些东西......用....访问

self.navigationItem.titleView = mySegmentedControl

供将来参考....

self.navigationItem.rightBarButtonItem
self.navigationItem.leftBarButtonItems // for adding an Array of items

要将其添加到导航视图下方，但将其设置为静态..将其添加到viewController.view ...您使用的是UITableViewController吗？如果是这样，可以切换到UIViewController并添加一个tableView，然后将您的toolbarview作为该self.view的子视图。

Answer 2

在Swift 5中的UINavigationBar中添加段控件

    let segment: UISegmentedControl = UISegmentedControl(items: ["First", "Second"])
    segment.sizeToFit()
    segment.tintColor = UIColor(red:0.99, green:0.00, blue:0.25, alpha:1.00)
    segment.selectedSegmentIndex = 0;
    segment.setTitleTextAttributes([NSAttributedString.Key.font : UIFont(name: "ProximaNova-Light", size: 15)!], for: .normal)
    self.navigationItem.titleView = segment

Answer 3

我认为你正在寻找这个。

let searchVC = self.storyboard?.instantiateViewController(withIdentifier:"idofcontroller")
let searchController = UISearchController(searchResultsController: searchVC)
searchController.searchResultsUpdater = self
searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search"
navigationItem.searchController = searchController
definesPresentationContext = true

searchController.searchBar.scopeButtonTitles = ["News", "Photos", "Videos"]
searchController.searchBar.delegate = self

Answer 4

这就是我在Objective C中的表现（对不起，我还没有学过Swift）：

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.viewControllers = [self segmentViewControllers];

    self.segmentedControl = [[UISegmentedControl alloc] initWithItems: [self.segmentedControl addTarget: self
                          action: @selector(segmentClicked:)
                forControlEvents: UIControlEventValueChanged];

    CGFloat topOffset = self.navigationController.navigationBar.frame.size.height + [UIApplication sharedApplication].statusBarFrame.size.height;

    self.toolbar = [[UIToolbar alloc] initWithFrame: CGRectMake(0, topOffset, self.navigationController.navigationBar.frame.size.width, kDefaultViewHeight)];
    self.toolbar.delegate = self;

    self.navigationController.navigationBar.backgroundColor = [UIColor whiteColor];
    self.toolbar.backgroundColor = [UIColor whiteColor];
    self.toolbar.clipsToBounds = YES;

    UIBarButtonItem *segmentedControlItem = [[UIBarButtonItem alloc] initWithCustomView: self.segmentedControl];
    UIBarButtonItem *flexibleItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace
                                                                              target: nil
                                                                              action: nil];

    [self.toolbar setItems: @[flexibleItem, segmentedControlItem, flexibleItem] animated: YES];

    [self.navigationController.view addSubview: self.toolbar];

    self.segmentedControl.selectedSegmentIndex = 0;
}

在UITableViewController（segmentViewControllers之一）中：

  self.tableView.contentInset = UIEdgeInsetsMake(topOffset, 0, 0, 0);

    CGRect currentFrame = self.tableView.frame;
    [self.tableView setFrame: CGRectMake(currentFrame.origin.x,
                                     currentFrame.origin.y,
                                     currentFrame.size.width,
                                     currentFrame.size.height + [UIApplication sharedApplication].statusBarFrame.size.height)];

Answer 5

你可以自定义navigationItem的titleView，如下所示：

self.navigationItem.titleView = segmentview

你不应该将子视图添加到导航栏，对于推后或弹出UIViewcontroller，子视图仍然在导航栏上显示。

Answer 6

您还可以将细分控件添加到搜索栏，而不是导航项。如果您像我一样，我需要一个大的标题+搜索栏+导航项，这对于当前的最佳答案是不可能的。

@Abhishek的答案很接近。您将执行以下操作：

// Create the search controller
let searchController = UISearchController(searchResultsController: nil)
searchController.searchResultsUpdater = self
searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.scopeButtonTitles = ["Option 1", "Option 2"]

// Make sure the scope bar is always showing, even when not actively searching
searchController.searchBar.showsScopeBar = true

// Make sure the search bar is showing, even when scrolling
navigationItem.hidesSearchBarWhenScrolling = false

// Add the search controller to the nav item   
navigationItem.searchController = searchController
definesPresentationContext = true

@Gurjit Singh，带有.showsScopeBar = true的行是您的问题的解决方案。