MacCatalyst 键盘输入监听

下面的方法放到AppDelegate里即可

#pragma mark- 键盘监听

-(void)pressesBegan:(NSSet *)presses withEvent:(UIPressesEvent*)event {

    /**

     // 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);

     */

    BOOL didHandleEvent=NO;

    for(UIPress*press in presses) {

        if(@available(macCatalyst13.4, *)) {

            UIKey*key=press.key;//键值

            //匹配键值

            if ([key.charactersIgnoringModifiers isEqualToString:UIKeyInputEscape]) {//esc

                didHandleEvent=YES;

              }

            if ([key.charactersIgnoringModifiers isEqualToString:UIKeyInputLeftArrow]) {//左箭头

                didHandleEvent=YES;

            }

            if ([key.charactersIgnoringModifiers isEqualToString:UIKeyInputRightArrow]) {//右箭头

                didHandleEvent=YES;

            }

        }else{

            // Fallback on earlier versions

        }

    }

    if(!didHandleEvent) {//没取到匹配值,调用父类

        [superpressesBegan:presseswithEvent:event];

    }

}