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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86
第 3 章
输入
如果不能从用户接收输入，那我们的游戏除了徒然拥有一个漂亮的界面以外什么都
不是。在本章，我们来看一下在游戏中常见的从用户获取输入的方法。游戏知道用
户要做什么的唯一方式就是搜集输入信息，而设备内置的触摸屏，则是玩家提供输
入的主要方式。
从底层的实现上讲，触摸屏是一种非常复杂的技术。但它提供给我们的游戏信息却
非常简单：每当屏幕上发生一个触摸、手指移动以及手指离开屏幕时，它都会通知
我们。听起来很普通
(
可以通过检测屏幕点击来实现），但
iOS
中已经内置了触摸
系统，触摸系统利用这些信息可以判断出用户正在做什么动作：拖拽、捏合、旋转
或者轻击，从而明白用户到底想要做什么操作。
除了触摸系统，
iOS
设备内置了许多传感装置，这些装置能够感知硬件的当前状态。
这些装置包括加速计（感知移动和重力），陀螺仪（感知旋转），磁力计（感知磁
场），
GPS
或全球定位系统（感知地理位置）。
我们可以通过这些信息来充分了解用户正在设备上进行的操作，并以此作为游戏的
输入。例如，我们可以通过获取用户某个时刻的移动距离来计算用户的速度，这就
可以让我们判断出玩家是否正在乘坐某种车辆，并以此作为游戏输入。
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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.
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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.