如何在tvOS中以编程方式更改焦点 [英] How to change focus programmatically in tvOS

问题描述

我正在快速开发一个tvOS应用程序。我在应用程序中使用 UITabBarController 。
我的要求是在10秒后自动隐藏tabbar，焦点可以移动到tabbar项目内的 AVPlayerViewController 。
我试图覆盖 preferredFocusedView ，但是焦点不能移动到 AVPlayerViewController 。

  func updateFocus（）{
 
 self.playerController.view.hidden = false 
 self.playerController.view.alpha = 1.0 
 self.playerController.view.userInteractionEnabled = true 
 self.playerController.view.layer.zPosition = 1.0 
 self.preferredFocusedView $ b $ setNeedsFocusUpdate（）
 updateFocusIfNeeded（ ）
} 
 
覆盖var preferredFocusedView：UIView？ {
 
 return self.playerController.view 
 
} 
  

请教我如何以编程方式移动焦点。 $ c>当时不在 viewController 中，而焦点在 tabBarController 中，所以我建议你做像这样的
创建一个 TabBarController 子类，并在故事板中设置你的tabController类到该类，然后在 tabBarController subClass做这样的事情。



  #importTabBarViewController.h
 
 @interface TabBarViewController（）
 
 @end 
 
 @implementation TabBarViewController 
 
  - （void）viewDidLoad {
 [super viewDidLoad]; 
 self.tabBar.alpha = 0; 
 //当你需要的时候再设置alpha = 1。 
 
 $ b  - （UIView *）preferredFocusedView 
 {
 //你也可以在这里添加一些if 
 return [self.selectedViewController preferredFocusedView]; //或者你可以做self.selectedViewController.view如果这个视图是可以关注的
 
 $ b $ end 
 code $ pre $ 
 
 
我在这里选择的视图控制器是FirstViewController，它看起来像这样并且工作正常。
 
 pre $  #importFirstViewController.h
 
 @interface FirstViewController（）
 @property（弱，非原子）IBOutlet UIButton * button; 
 
 @end 
 
 @implementation FirstViewController 
 
  - （void）viewDidLoad {
 [super viewDidLoad]; 
 
 $ b  - （UIView *）preferredFocusedView 
 {
 return _button; //返回您想要关注的视图
} 
 @end 
  




I am developing a tvOS app in swift. I am using UITabBarController in the app. My requirement is to hide the tabbar automatic after 10 seconds and focus can move to AVPlayerViewController inside the tabbar item. I tried to override preferredFocusedView, but focus cannot move to AVPlayerViewController.

func updateFocus() {

    self.playerController.view.hidden = false
    self.playerController.view.alpha = 1.0
    self.playerController.view.userInteractionEnabled = true
    self.playerController.view.layer.zPosition = 1.0
    self.preferredFocusedView
    setNeedsFocusUpdate()
    updateFocusIfNeeded()
}

override var preferredFocusedView: UIView? {

    return self.playerController.view

}

Please suggest me how to move focus programmatically.

解决方案

Issue is focus is not in viewController at that time instead focus is in tabBarController, so what I will suggest you is do something like this, Create a TabBarController subClass and set class of your tabController in story board to that class, and then in tabBarController subClass do something like this.

  #import "TabBarViewController.h"

    @interface TabBarViewController ()

    @end

    @implementation TabBarViewController

    - (void)viewDidLoad {
        [super viewDidLoad];
        self.tabBar.alpha = 0;
        // set alpha = 1 back again when you need.
    }

    - (UIView*)preferredFocusedView
    {
// you can also add some if else here
        return [self.selectedViewController preferredFocusedView];// or you can do self.selectedViewController.view if that view is focusable
    }

    @end

My selected view controller here is FirstViewController which look like this and its working fine.

#import "FirstViewController.h"

@interface FirstViewController ()
@property (weak, nonatomic) IBOutlet UIButton *button;

@end

@implementation FirstViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (UIView*)preferredFocusedView
{
    return _button;// return view which you want to make focus able
}
@end

这篇关于如何在tvOS中以编程方式更改焦点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！