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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人工智能和行为
｜
285
to: to
destroy: destroy
the: the
Ring: ring
Mr Frodo: Mr
讨论
语言标签对于文字游戏来说很有用，例如，你可以识别出用户输入的命令（如“
open
the door
”）中的动词。
打标签的方案（
scheme
）有很多，这取决于你要分析的是什么语言了。要了解有哪
些方案可用，你可以使用
NSLinguisticTagger
类的
availableTagSchemes
方法：
//
针对英语的所有标记方案
NSLinguisticTagger.availableTagSchemes(forLanguage: "en")
9.14
用
AVFoundation
框架访问相机
问题
为了显示摄像头的视频画面，你要直接访问相机。
解决方案
用
AVFoundation
框架创建一个
AVCaptureSession
，创建时用相机作为输入源：
1.
首先，新建一个
single-view
项目。
2.
打开
Main.storyboard
。在
Object Library
中找到
Tap Gesture Recognizer
，将它
拖到
view controller
的
view
上。
3.
在
Outline
窗口中选中刚刚添加的
Tap Gesture Recognizer
。如果未打开
Outline
窗口，请点击画布左下角的按钮。
4.
打开助手编辑器，显示
ViewController
的源代码文件。
5.
按住
ctrl
键，从
Tap Gesture ...
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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.