小编sts*_*spb的帖子

我正在开发我目前的iPhone音频应用程序以支持CarPlay.我已经获得Apple的批准并获得了开发权利,并观看了视频"为CarPlay启用应用程序"(https://developer.apple.com/videos/play/wwdc2017/719/).在视频中有一段Swift代码演示了如何添加CarPlay UI:

func updateCarWindow()  
{  
    guard let screen = UIScreen.screens.first(where: 
    { $0.traitCollection.userInterfaceIdiom == .carPlay })  
    else  
    {  
        // CarPlay is not connected  
        self.carWindow = nil;  
        return  
    }  

    // CarPlay is connected  
    let carWindow = UIWindow(frame: screen.bounds)  
    carWindow.screen = screen  
    carWindow.makeKeyAndVisible()  
    carWindow.rootViewController = CarViewController(nibName: nil, bundle: nil)  
    self.carWindow = carWindow
}

我将它重新编写为Objective-C版本,如下所示:

- (void) updateCarWindow  
{  
    NSArray *screenArray = [UIScreen screens];  

    for (UIScreen *screen in screenArray)  
    {        
        if (screen.traitCollection.userInterfaceIdiom == UIUserInterfaceIdiomCarPlay)  // CarPlay is connected.
        {  
            // Get the …