January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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使用外设
｜
301
上述代码创建了一个按钮，当用户点击该按钮，就可以从一个设备列
表中选择一个
AirPlay
设备进行连接。当用户选择大屏后，会发送一个
UIScreenDidConnectNotification
通知，我们就可以在游戏中通过
UIScreen
类使用
该
AirPlay
设备（见本章
10.4
节）。
MPVolumeView
只有在搜到有效的
AirPlayer
设备时才能显示
AirPlay
选择器。
如果附近没有搜到
AirPlay
设备，则什么也不会显示。
而且，我们只能将
AirPlay
选项中的镜像开关打开后（通过控制中心）才
能收到
UIScreenDidConnectNotification
通知。如果没有打开镜像功能，
AirPlay
只会将游戏中正在播放的声音投放到指定的设备上，而图像则不会。
讨论
当用户选择了一个
AirPlay
显示器时，
iOS
会将其作为一个已连接的屏幕来对待。
你可以通过
UIScreen
来使用它
(
这一点，不管是有线连接的还是无线连接的显示
器都没有任何区别
)
。
就像一个有线连接的屏幕，主显示器的内容会映射到外接屏幕上。如果我们将这个
屏幕赋予一个
UIWindow
对象，镜像功能将被关闭，屏幕立即显示
UIWindow
中的内容。
当我们从
UIWindow
对象中移除这个
UIScreen
对象，这个屏幕又会回到镜像模式。
如果扩展屏幕超过两个，则只有一个屏幕能和主显示器进行镜像。其他屏幕
则显示空白一直到我们将它们赋给某个
UIWindow
。
10.4
使用扩展屏幕
问题
我们想将游戏内容显示到 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.