Unity 如何在 iOS 新增键盘 KeyCode 响应事件

1.定位到文件UnityView+Keyboard.mm同如下路径:

2.打开该Objective-C脚本进行编辑,找到关键函数: createKeyboard:

- (void)createKeyboard
{// only English keyboard layout is supportedNSString* baseLayout = @"1234567890-=qwertyuiop[]asdfghjkl;'\\`zxcvbnm,./!@#$%^&*()_+{}:\"|<>?~ \t\r\b\\";NSString* numpadLayout = @"1234567890-=*+/.\r";NSString* upperCaseLetters = @"QWERTYUIOPASDFGHJKLZXCVBNM";size_t sizeOfKeyboardCommands = baseLayout.length + numpadLayout.length + upperCaseLetters.length + 11;NSMutableArray* commands = [NSMutableArray arrayWithCapacity: sizeOfKeyboardCommands];void (^addKey)(NSString *keyName, UIKeyModifierFlags modifierFlags) = ^(NSString *keyName, UIKeyModifierFlags modifierFlags){UIKeyCommand* command = [UIKeyCommand keyCommandWithInput: keyName modifierFlags: modifierFlags action: @selector(handleCommand:)];
#if UNITY_HAS_IOSSDK_15_0if (@available(iOS 15.0, tvOS 15.0, *))command.wantsPriorityOverSystemBehavior = YES;
#endif[commands addObject:command];};for (NSInteger i = 0; i < baseLayout.length; ++i){NSString* input = [baseLayout substringWithRange: NSMakeRange(i, 1)];NSLog(@"%@ !!!",input);addKey(input, kNilOptions);}for (NSInteger i = 0; i < numpadLayout.length; ++i){NSString* input = [numpadLayout substringWithRange: NSMakeRange(i, 1)];addKey(input, UIKeyModifierNumericPad);}for (NSInteger i = 0; i < upperCaseLetters.length; ++i){NSString* input = [upperCaseLetters substringWithRange: NSMakeRange(i, 1)];addKey(input, UIKeyModifierShift);}// pageUp, pageDownaddKey(@"UIKeyInputPageUp", kNilOptions);addKey(@"UIKeyInputPageDown", kNilOptions);// up, down, left, right, escaddKey(UIKeyInputUpArrow, kNilOptions);addKey(UIKeyInputDownArrow, kNilOptions);addKey(UIKeyInputLeftArrow, kNilOptions);addKey(UIKeyInputRightArrow, kNilOptions);addKey(UIKeyInputEscape, kNilOptions);// caps Lock, shift, control, option, commandaddKey(@"", UIKeyModifierAlphaShift);addKey(@"", UIKeyModifierShift);addKey(@"", UIKeyModifierControl);addKey(@"", UIKeyModifierAlternate);addKey(@"", UIKeyModifierCommand);keyboardCommands = commands.copy;
}

此函数由Unity定义,通过addKey函数负责初始化注册所有需要响应的按键.

   void (^addKey)(NSString *keyName, UIKeyModifierFlags modifierFlags) = ^(NSString *keyName, UIKeyModifierFlags modifierFlags){UIKeyCommand* command = [UIKeyCommand keyCommandWithInput: keyName modifierFlags: modifierFlags action: @selector(handleCommand:)];
#if UNITY_HAS_IOSSDK_15_0if (@available(iOS 15.0, tvOS 15.0, *))command.wantsPriorityOverSystemBehavior = YES;
#endif[commands addObject:command];};

函数接受两个参数第一个是keyName表示接收的按键名称例如键盘上的a-z,第二个参数为UIKeyModifierFlags表示作为Modifier的按键种类如下:

  typedef   NS_OPTIONS(NSInteger, UIKeyModifierFlags) {UIKeyModifierAlphaShift     = 1 << 16,  // This bit indicates CapsLockUIKeyModifierShift          = 1 << 17,UIKeyModifierControl        = 1 << 18,UIKeyModifierAlternate      = 1 << 19,UIKeyModifierCommand        = 1 << 20,UIKeyModifierNumericPad     = 1 << 21,} API_AVAILABLE(ios(7.0));

使用时例如用户需要接收处理command a,需调用addKey(@"a", UIKeyModifierCommand); 针对于特殊按键对应的NSString存储于UIResponder.h中:

// These are pre-defined constants for use with the input property of UIKeyCommand objects.
UIKIT_EXTERN NSString *const UIKeyInputUpArrow         API_AVAILABLE(ios(7.0));
UIKIT_EXTERN NSString *const UIKeyInputDownArrow       API_AVAILABLE(ios(7.0));
UIKIT_EXTERN NSString *const UIKeyInputLeftArrow       API_AVAILABLE(ios(7.0));
UIKIT_EXTERN NSString *const UIKeyInputRightArrow      API_AVAILABLE(ios(7.0));
UIKIT_EXTERN NSString *const UIKeyInputEscape          API_AVAILABLE(ios(7.0));
UIKIT_EXTERN NSString *const UIKeyInputPageUp          API_AVAILABLE(ios(8.0));
UIKIT_EXTERN NSString *const UIKeyInputPageDown        API_AVAILABLE(ios(8.0));
UIKIT_EXTERN NSString *const UIKeyInputHome            API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputEnd             API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF1              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF1              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF2              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF3              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF4              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF5              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF6              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF7              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF8              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF9              API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF10             API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF11             API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputF12             API_AVAILABLE(ios(13.4), tvos(13.4)) API_UNAVAILABLE(watchos);
UIKIT_EXTERN NSString *const UIKeyInputDelete          API_AVAILABLE(ios(15.0), tvos(15.0)) API_UNAVAILABLE(watchos);

此文档以F1-F12按键添加为例:使用addKey(UIKeyInputF4, kNilOptions);

    addKey(UIKeyInputF1, kNilOptions);addKey(UIKeyInputF2, kNilOptions);addKey(UIKeyInputF3, kNilOptions);addKey(UIKeyInputF4, kNilOptions);

1. 注册好按键后还需要在handleCommand函数中进行响应处理:

- (void)handleCommand:(UIKeyCommand *)command
{NSString* input = command.input;UIKeyModifierFlags modifierFlags = command.modifierFlags;char inputChar = ([input length] > 0) ? [input characterAtIndex: 0] : 0;int code = (int)inputChar; // ASCII codeUnitySendKeyboardCommand(command);if (![self isValidCodeForButton: code]){code = 0;}if ((modifierFlags & UIKeyModifierAlphaShift) != 0)code = UnityStringToKey("caps lock");if ((modifierFlags & UIKeyModifierShift) != 0)code = UnityStringToKey("left shift");if ((modifierFlags & UIKeyModifierControl) != 0)code = UnityStringToKey("left ctrl");if ((modifierFlags & UIKeyModifierAlternate) != 0)code = UnityStringToKey("left alt");if ((modifierFlags & UIKeyModifierCommand) != 0)code = UnityStringToKey("left cmd");if ((modifierFlags & UIKeyModifierNumericPad) != 0){switch (inputChar){case '0':code = UnityStringToKey("[0]");break;case '1':code = UnityStringToKey("[1]");break;case '2':code = UnityStringToKey("[2]");break;case '3':code = UnityStringToKey("[3]");break;case '4':code = UnityStringToKey("[4]");break;case '5':code = UnityStringToKey("[5]");break;case '6':code = UnityStringToKey("[6]");break;case '7':code = UnityStringToKey("[7]");break;case '8':code = UnityStringToKey("[8]");break;case '9':code = UnityStringToKey("[9]");break;case '-':code = UnityStringToKey("[-]");break;case '=':code = UnityStringToKey("equals");break;case '*':code = UnityStringToKey("[*]");break;case '+':code = UnityStringToKey("[+]");break;case '/':code = UnityStringToKey("[/]");break;case '.':code = UnityStringToKey("[.]");break;case '\r':code = UnityStringToKey("enter");break;default:break;}}if (input == UIKeyInputUpArrow)code = UnityStringToKey("up");else if (input == UIKeyInputDownArrow)code = UnityStringToKey("down");else if (input == UIKeyInputRightArrow)code = UnityStringToKey("right");else if (input == UIKeyInputLeftArrow)code = UnityStringToKey("left");else if (input == UIKeyInputEscape)code = UnityStringToKey("escape");else if ([input isEqualToString: @"UIKeyInputPageUp"])code = UnityStringToKey("page up");else if ([input isEqualToString: @"UIKeyInputPageDown"])code = UnityStringToKey("page down");KeyMap::iterator item = GetKeyMap().find(code);if (item == GetKeyMap().end()){// New key is down, register it and its timeUnitySetKeyboardKeyState(code, true);GetKeyMap()[code] = GetTimeInSeconds();}else{// Still holding the key, update its timeitem->second = GetTimeInSeconds();}
}

函数中input表示createKeyboard函数注册对应的keyName,modifierFlags表示注册时传入的modifierFlags.函数中的Code对应Unity的KeyCodeEnum:

using System;namespace UnityEngine
{// Key codes returned by Event.keyCode. These map directly to a physical key on the keyboard.public enum KeyCode{// Not assigned (never returned as the result of a keystroke)None = 0,// The backspace keyBackspace       = 8,// The forward delete keyDelete      = 127,// The tab keyTab     = 9,// The Clear keyClear       = 12,// Return keyReturn      = 13,// Pause on PC machinesPause       = 19,// Escape keyEscape      = 27,// Space keySpace       = 32,// Numeric keypad 0Keypad0     = 256,// Numeric keypad 1Keypad1     = 257,

前添加判断并给code进行赋值即可,F1-F12对应282-294以此为例代码如下:

   if (input == UIKeyInputF1)code = 282;else if (input == UIKeyInputF2)code = 283;else if (input == UIKeyInputF3)code = 284;

1. 测试结果如下: