navigationbar

问题 I want to add a right bar button item to the navigation bar, so that on click, it performs certain a function. I have created the following code to add the right bar button item, but after it is done, the bar button item is not getting displayed in navigation bar: -(void)viewDidload{ self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(Add:)] autorelease]; } -(IBAction)Add:(id)sender {

问题 I'm using really naive code to show a bottom sheet dialog fragment: class LogoutBottomSheetFragment : BottomSheetDialogFragment() { override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.view_image_source_chooser, container, false) return view } } This is how I called this dialog: LogoutBottomSheetFragment().show(supportFragmentManager, "logout") But I get this horrible shown in the image below. How

问题 Can I customize the color of the navigation bar in the QlPreviewController controller? I have tried following [[UINavigationBar appearanceWhenContainedIn: [QLPreviewController class], nil] setBarTintColor: [UIColor redColor]]; but it does not work. Thanks. 回答1: Yeah, there is a bug with barTintColor on QLPreviewController for iOS 11 if you are showing it via presentViewController: animated: Here's my solution, use setBackgroundImage: with 1x1 image instead of setBarTintColor: [

问题 I am adding two custom buttons on navigation bar. one at left and other at right. I am successfully done with it, but I failed to reduce the space between the starting point and frame of buttons. I tried a lot, also gave the negative value of x, still didn't helped. Here is the code for buttons -(void)addLeftButton { UIButton *aButton = [UIButton buttonWithType:UIButtonTypeCustom]; aButton.backgroundColor = [UIColor redColor]; [aButton setTitle:@"H" forState:UIControlStateNormal]; aButton

问题 I'm creating an App for Ipad, I created 3 views with a navigation bar but I would to start my application not in first but in second view, what can i do? 回答1: You can setup UINavigationController with an initial navigation stack via setViewControllers:animated: . // in application:didFinishLaunchingWithOptions: self.navigationController = [[UINavigationController new] autorelease]; UIViewController *first = [[MyFirstViewController new] autorelease]; UIViewController *second = [

问题 I have written a test iPad app which contains only a split view. I used the storyboard for set the split view. I did not do any modification to the generated split view controller by the storyboard. But did some modifications to the master view controller and the detail view controller as follow, Master View Controller: - (void)viewDidLoad { [super viewDidLoad]; ............ if ([self respondsToSelector:@selector(edgesForExtendedLayout)]) { self.edgesForExtendedLayout = UIRectEdgeNone; } }

问题 Is there a way to set the navigationbar color in a fullscreen activity? if(android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { getWindow().setNavigationBarColor(getResources().getColor(R.color.Theme_color)); And this line in my theme-style: <item name="android:navigationBarColor" tools:targetApi="21">#E64A19</item> Both resulting in the same transparant navbar above my activities layout... Code: Acitivity : @Override protected void onCreate(Bundle savedInstanceState) { super

问题 I was wondering how I could hide the navigation bar in an Android application? I know how to hide it initially, but as soon as I touch the screen it pops back up. I want to hide it the same way games like Clash of Clans hide it where the only way to make it pop up is by swiping down the notifications or by swiping where the navigation bar should be. 回答1: use immersive mode check this Immersive mode // This snippet hides the system bars. private void hideSystemUI() { // Set the IMMERSIVE flag.

问题 I am making a basic launcher app where i needed my notification bar and status bar to be perfectly transparent. So i used below code. Window w = getWindow(); // in Activity's onCreate() for instance w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS); Which does the trick but the color of the softkeys is not white as shown in figure below. How do i make it white? 回答1: Ok finally solved it in lollipop. But i haven't tested in devices

问题 I have implemented large titles in my app with the following code: if #available(iOS 11.0, *) { navigationController?.navigationBar.prefersLargeTitles = true navigationItem.largeTitleDisplayMode = .always } else { // Fallback on earlier versions } } func scrollViewDidScroll(_ scrollView: UIScrollView) { if scrollView.contentOffset.y <= 0 { if #available(iOS 11.0, *) { self.navigationItem.largeTitleDisplayMode = .always } else { // Fallback on earlier versions } } else { if #available(iOS 11.0