游戏控制器介绍及代码集成

在iOS7中，苹果加强了对游戏开发的支持，其中一个功能就是增加了Game Controller Framework （GameController.framework）可以让你在程序中发现游戏控制器硬件并进行配置。通过Game Controller Framework可以通过无线或者蓝牙连接iOS设备。当控制器可用的时候，该Framework会通知应用程序。
Game Controller Framework 支持三种类型的控制器
• 标准的控制器：该控制器具有一个方向键，一个暂停按钮，四个按钮和两个肩部按钮。
• 扩展的控制器：该控制器跟标准控制器类似，但它可以有两个杆和四个肩部按钮。
• 扩展无线控制器：跟上面的控制器类似，但它以无线方式工作，不需要将IOS设备放置到控制器里面。




软件环境：ios7 + xcode5
操作系统：OSX 10.8.4
实现过程：
1:将游戏控制器的Connet和Disconnet状态进行事件注册

- (void)configureGameControllers {

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(gameControllerDidConnect:) name:GCControllerDidConnectNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(gameControllerDidDisconnect:) name:GCControllerDidDisconnectNotification object:nil];

[GCController startWirelessControllerDiscoveryWithCompletionHandler:^{

// we don't use any code here since when new controllers are found we will get notifications
}];
}

实现相应注册事件的代码

- (void)gameControllerDidConnect:(NSNotification *)notification {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning"
message:@"Game controller connected. Do you want to use it?"
delegate:self
cancelButtonTitle:@"No"
otherButtonTitles:@"Yes", nil];
[alert show];
}
- (void)gameControllerDidDisconnect:(NSNotification *)notification {

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning"
message:@"Game controller has disconnected."
delegate:nil
cancelButtonTitle:@"Ok"
otherButtonTitles:nil, nil];
[alert show];
}

2：遍历所有的控制器，并对其按键进行注册

- (void)configureConnectedGameControllers {
for (GCController *controller in [GCController controllers]) {
[self setupController:controller ];
}
}

- (void)setupController:(GCController *)controller 
{
/** 对X,Y,A,B键位进行注册
**/
GCControllerButtonValueChangedHandler XYABButtonHandler = ^(GCControllerButtonInput *button, float value, BOOL pressed) {
};
if (controller.gamepad) {
controller.gamepad.buttonA.valueChangedHandler = XYABButtonHandler;
controller.gamepad.buttonB.valueChangedHandler = XYABButtonHandler;
controller.gamepad.buttonX.valueChangedHandler = XYABButtonHandler;
controller.gamepad.buttonY.valueChangedHandler = XYABButtonHandler;
}
if (controller.extendedGamepad) {
controller.extendedGamepad.buttonA.valueChangedHandler = XYABButtonHandler;
controller.extendedGamepad.buttonB.valueChangedHandler = XYABButtonHandler;
controller.extendedGamepad.buttonX.valueChangedHandler = XYABButtonHandler;
controller.extendedGamepad.buttonY.valueChangedHandler = XYABButtonHandler;
}
/** 对肩部的键位进行注册
**/
GCControllerButtonValueChangedHandler LRShoulderHandler = ^(GCControllerButtonInput *button, float value, BOOL pressed) {
};
if (controller.gamepad) {
controller.gamepad.leftShoulder.valueChangedHandler = LRShoulderHandler;
controller.gamepad.rightShoulder.valueChangedHandler = LRShoulderHandler;
}
if (controller.extendedGamepad) {
controller.extendedGamepad.leftShoulder.valueChangedHandler = LRShoulderHandler;
controller.extendedGamepad.rightShoulder.valueChangedHandler = LRShoulderHandler;
}
/**对方向键进行注册
**/
GCControllerDirectionPadValueChangedHandler LRThumbHandler = ^(GCControllerDirectionPad *dpad, float xValue, float yValue) {
};
if (controller.extendedGamepad) {
controller.extendedGamepad.leftThumbstick.valueChangedHandler = LRThumbHandler;
controller.extendedGamepad.rightThumbstick.valueChangedHandler = LRThumbHandler;
}
if (controller.gamepad.dpad) {
controller.gamepad.dpad.valueChangedHandler = dpadMoveHandler;
}

}

参考：《iOS 7 Game Development》