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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294
第 10 章
使用外设
iOS
设备能和各种各样的外部设备进行交互，包括外接屏幕和游戏控制器，这些设
备对于我们的游戏来说尤其有用。
iOS
从
iOS 2
开始支持多屏显示，但直到
iOS7
开始才支持游戏控制器。游戏控制器
是一种手持装置，专门用于向游戏玩家提供物理按键。与触摸屏相比，游戏控制器
既有优点，又有缺点。由于游戏控制器提供了物理按键，玩家的双手的操纵感更强，
更容易让玩家将注意力集中到游戏画面。另外，游戏控制器具备模拟输入的特性：
当按钮被按下时，控制器能感受到力道的大小，从而让游戏做出相应的反应。但是，
游戏控制器的按键是固定的，其位置和外观都无法改变，或者无法在运行时改变。
能在
iOS
上使用的游戏控制器必须遵循苹果的一系列设计规范；这些规范规定无论
什么厂商制造的游戏控制器，其行为都是一致的，在游戏中的操作方式也是一样的。
更麻烦的是，游戏控制器有不同的版本。最简单的一种（通常也是最便宜的）是标
准游戏控制器（见图
10-1
），它有两个侧按键，
4
个字母键，一个暂停键，一个十
字方向键。另外一种是增强型游戏手柄（见图
10-2
），包含了标准型的所有按键以
及两个摇杆，两个扳机。你的游戏不一定每个按键都要使用，但多一个键总是好的。
除了游戏控制器，
iOS
游戏也可以使用外接屏幕。外接屏幕可以通过线缆直接连接
到
iOS
设备，也可以通过
AirPlay
进行无线连接。要使用外接屏幕，我们需要做许
多事情，例如，要让我们的游戏除了能在内置屏幕上显示，还要能在大屏上显示。
甚至将
iPhone
变成游戏控制器，而将游戏画面显示到电视机上 ...
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