在 iOS 14 Objective-C 中连接多个键盘

Question

iOS 14介绍GCKeyboard。我能够在我的应用程序中成功连接 BlueTooth NumberPad，但我需要能够串联连接其中的两个。谁能给我指出示例代码？

在 GCController class 中有一个“controllers”方法，其中 returns 所有连接的控制器的数组，但没有任何类似的东西 GCKeyboard.

这是我的代码：

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [[UIApplication sharedApplication]setIdleTimerDisabled:YES];

    // notifications for keyboard (dis)connect
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyboardWasConnected:) name:GCKeyboardDidConnectNotification object:nil];
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyboardWasDisconnected:) name:GCKeyboardDidDisconnectNotification object:nil];
}

GCKeyboard *leftKeyboard;
GCKeyboard *rightKeyboard;

- (void)keyboardWasConnected:(NSNotification *)notification {
    
    if (!self.leftKeyboard) {
        leftKeyboard = (GCKeyboard *)notification.object;
        NSLog(@"Left Keyboard connected: %@\n", leftKeyboard.description);
        NSString *keyboardStatus = [NSString stringWithFormat:@"Left Keyboard CONNECTED:\n%@", leftKeyboard.description];
        self.statusLabel.text = keyboardStatus;
        
        self.leftKeyboard = leftKeyboard;
        [self reactToKeyboardInput];
    }
    else if (!self.rightKeyboard) {
        NSLog(@"Right Keyboard connected: %@\n", rightKeyboard.description);
        rightKeyboard = (GCKeyboard *)notification.object;
        NSString *keyboardStatus = [NSString stringWithFormat:@"Right Keyboard CONNECTED:\n%@", rightKeyboard.description];
        self.statusLabel.text = keyboardStatus;
        
        self.rightKeyboard = rightKeyboard;
        [self reactToKeyboardInput];
    }
}

- (void)keyboardWasDisconnected:(NSNotification *)notification {
    
    if (self.leftKeyboard) {
        GCKeyboard *keyboard = (GCKeyboard *)notification.object;
        NSString *status = [NSString stringWithFormat:@"Left Keyboard DISCONNECTED:\n%@", keyboard.description];
        self.statusLabel.text = status;
    
        self.leftKeyboard = nil;
    }
    else if (self.rightKeyboard) {
        GCKeyboard *keyboard = (GCKeyboard *)notification.object;
        NSString *status = [NSString stringWithFormat:@"Right Keyboard DISCONNECTED:\n%@", keyboard.description];
        self.statusLabel.text = status;
    
        self.rightKeyboard = nil;
    }
}

连接键盘或数字键盘后，我收到消息：

2020-09-18 13:09:15.845943-0700 Controller[1653:351628] Left Keyboard connected: GCController 0x280bb8dd0 ('Keyboard' - 0x27c3dc28cec4d818)

Answer 1

“将键盘和鼠标游戏带入 iPad”WWDC 视频抄本指出：

In the case of keyboards, you can't differentiate multiple keyboards, and all keyboard events from multiple keyboards are instead coalesced for you. So while you might use notifications to notice when a keyboard disconnects and perhaps pause the game to prompt for different input, in general, you'll find that just using GCKeyboard-Device.coalesced to check on the key state when non-nil is the right path.

因此，虽然您可能连接了多个键盘，但听起来它们都合并到一个 GCKeyboard 实例中，您无法区分它们。这就是为什么没有 +[GCKeyboard keyboards] 方法的原因。取而代之的是 +[GCKeyboard coalescedKeyboard]

在 iOS 14 Objective-C 中连接多个键盘

Connecting multiple keyboards in iOS 14 Objective-C

objective-c

ios14