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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298
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第
10
章
llerDiscovery(completionHandler:)
方法。这个方法让系统查找设备附近的游戏
控制器，每当找到一个控制器就发送一个
GCControllerDidConnectNotification
通
知。当查找过程结束，无论是否找到有效的控制器，这个方法都会调用闭包代码：
//
调用后，你会收到来自无线手柄的
// GCControllerDidConnectNotification
和
// GCControllerDidDisconnectNotification
通知
GCController.startWirelessControllerDiscovery { () -> Void in
NSLog("Finished searching for wireless controllers")
}
需要注意的是，当我们查找无线手柄时，系统不会显示任何内置
UI
。最终需要我
们显示自己的
UI
，来告诉玩家我们正在查找游戏控制器。
当无线控制器建立好连接，我们就可以把它当成一个有线的控制器来使用，对你来
说，二者没有任何不同。
当我们拥有了一个
GCController
对象时，我们可以设置它的
playerIndex
属性。
设置这个属性时，控制器上的灯会亮起，提示玩家它是第几个玩家。这个属性在所
有游戏中都会被控制器记住，因此玩家可以从一个游戏切换到另一个游戏而无需关
心他是第几个玩家：
controller.playerIndex = GCControllerPlayerIndex.index1 ...
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