CNContactViewController隐藏导航栏

Question

CNContactViewController隐藏导航栏

iosobjective-cios10cncontactviewcontroller

5

当我将CNContactViewController推到UITableViewController子类的堆栈上，该子类处于UINavigationController中时，顶部导航栏几乎完全隐藏。但亮度调到最高后，你可以看到后退箭头后面跟着“Detail”一词和系统状态栏。当我点击屏幕的那个角落时，确实会关闭CNContactViewController。

当然，这并不好，因为用户可能甚至看不到导航栏的文本，也不知道如何按任何按钮来关闭它。

有没有办法使CNContactViewController的导航栏色调与显示它的视图控制器（我的应用程序的其余部分）相同？

CNContactViewController *controller = [CNContactViewController viewControllerForUnknownContact:person];

controller.contactStore = [[CNContactStore alloc] init];
controller.delegate = self;
controller.allowsActions = NO;

[self.navigationController pushViewController:controller animated:YES];

我应该注意到，我只在iOS 10上遇到了这个问题，而在10以下的版本中没有。当我点击“添加到现有联系人”时，我也能够获得正确着色的导航栏，但当该视图控制器被关闭时，它又会出现问题。

所以，我的问题是：有没有办法使CNContactViewController的导航栏色调与显示它的视图控制器（我的应用程序的其余部分）相同？

- user6168494

2个回答

2

我花了数小时与CNContactViewController纠缠，试图强制其适应我的UINavigation外观设置，但它却不行。它有自己的外观和感觉。我查看了像Mail和Notes这样的iOS应用程序，以查看它们如何显示CNContactViewController，似乎是显示为一个弹出窗口，所以我也走了这条路线。

即使如此也并不容易。CNContactViewController必须包装在UINavigationView中，以便Create New Contact和其他视图可以推动。如果您覆盖了UINavigationBar外观默认值，则需要在之前和之后将它们设置回标准值。最终效果如下：

@property (strong, nonatomic) CNContactViewController *contactViewController;
@property (assign, nonatomic) UIBarStyle saveAppearanceBarStyle;
@property (strong, nonatomic) UIColor *saveAppearanceBarTintColor;
@property (strong, nonatomic) UIColor *saveAppearanceTintColor;
@property (strong, nonatomic) UIColor *saveAppearanceBackgroundColor;
@property (strong, nonatomic) NSDictionary<NSAttributedStringKey, id> * saveAppearanceTitleTextAttributes;
@property (assign, nonatomic) BOOL saveAppearanceTranslucent;


- (IBAction)onAddToContactsButtonTapped:(id)sender

    self.contactViewController = [CNContactViewController viewControllerForUnknownContact: ... ]; // as before

    [self suspendNavBarAppearanceSettings];

    UINavigationController *popNav = [[UINavigationController alloc] initWithRootViewController:self.contactViewController];
    popNav.modalPresentationStyle = UIModalPresentationPopover;

    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(onAddToContactsDoneTapped:)];
    self.contactViewController.navigationItem.leftBarButtonItem = doneButton;

    [self presentViewController:popNav animated:YES completion:nil];

    UIPopoverPresentationController *popoverController = newNav.popoverPresentationController;
    popoverController.permittedArrowDirections = UIPopoverArrowDirectionAny;
    popoverController.sourceRect = ...;  // where you want it to point
    popoverController.sourceView = ...;  // where you want it to point
    popoverController.delegate = self;
}

- (void) suspendNavBarAppearanceSettings
{
    self.saveAppearanceBarStyle = [UINavigationBar appearance].barStyle;
    self.saveAppearanceBarTintColor = [UINavigationBar appearance].barTintColor;
    self.saveAppearanceTintColor = [UINavigationBar appearance].tintColor;
    self.saveAppearanceBackgroundColor = [UINavigationBar appearance].backgroundColor;
    self.saveAppearanceTitleTextAttributes = [UINavigationBar appearance].titleTextAttributes;
    self.saveAppearanceTranslucent = [UINavigationBar appearance].translucent;

    [UINavigationBar appearance].barStyle = UIBarStyleDefault;
    [UINavigationBar appearance].barTintColor = nil;
    [UINavigationBar appearance].tintColor = nil;
    [UINavigationBar appearance].backgroundColor = nil;
    [UINavigationBar appearance].titleTextAttributes = nil;
    [UINavigationBar appearance].translucent = YES;
}

- (void) restoreNavBarAppearanceSettings
{
    [UINavigationBar appearance].barStyle = self.saveAppearanceBarStyle;
    [UINavigationBar appearance].barTintColor = self.saveAppearanceBarTintColor;
    [UINavigationBar appearance].tintColor = self.saveAppearanceTintColor;
    [UINavigationBar appearance].backgroundColor = self.saveAppearanceBackgroundColor;
    [UINavigationBar appearance].titleTextAttributes = self.saveAppearanceTitleTextAttributes;
    [UINavigationBar appearance].translucent = self.saveAppearanceTranslucent;
}

- (void)onAddToContactsDoneTapped:(id)sender
{
    [self restoreNavBarAppearanceSettings];

    [[self presentedViewController] dismissViewControllerAnimated:YES completion:nil];
}

 #pragma mark - CNContactViewControllerDelegate

 - (void)contactViewController:(CNContactViewController *)viewController
        didCompleteWithContact:(nullable CNContact *)contact
 {
    [self restoreNavBarAppearanceSettings];

    [[self presentedViewController] dismissViewControllerAnimated:YES completion:nil];
 }

#pragma mark - UIPopoverPresentationControllerDelegate

- (void)prepareForPopoverPresentation:(UIPopoverPresentationController *)popoverPresentationController
{
    // This method is only called if we are presented in a popover, i.e. on iPad
    // as opposed to full screen like on a phone.

    // on iPad you just tap outside to finish, so remove the Done button
    self.contactViewController.navigationItem.leftBarButtonItem = nil;
}

- (void)popoverPresentationControllerDidDismissPopover:(UIPopoverPresentationController *)popoverPresentationController
{
    [self restoreNavBarAppearanceSettings];
}

- Ben

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- matt · Accepted Answer

您的第二个屏幕截图显示了这个问题的原因：您已将栏（或一般的栏按钮项）的色调设置为白色。因此，在联系人视图控制器中，它们是白色的，并且在透明导航栏和白色背景前也是白色的。

您无法直接改变栏的色调颜色，但可以通过以下两种方式解决此问题：

1. 使您的导航栏不透明。在这种情况下，联系人视图控制器的导航栏将是黑色的，您的白色栏按钮项将可见。 2. 另一种方法是在推送联系人视图控制器时更改导航栏的色调颜色（而不是栏色调颜色，而是向其栏按钮项传达的色调颜色），并在弹出时将其改回。

编辑：好吧，我看到还有一个进一步的问题，因为新联系人视图控制器是在您的前面呈现的另一个视图控制器。如果您不想放弃白色栏按钮项设置，那么您必须使用外观代理来在推送联系人视图控制器时将UIBarButtonItem的色调颜色设置为其他颜色，然后当您的导航控制器委托告诉您用户正在弹回到您的视图控制器时，将其重置回白色。