macOS Catalina-屏幕(虚拟)键盘不起作用

问题描述

我一直在使用下面的代码来显示虚拟屏幕键盘，到目前为止，在10.14之前都可以正常工作，但是在Catalina(10.15)上不再起作用.在Catalina上，它不再能够创建输入源，并且始终为空-

I have been using below code to show the virtual onscreen keyboard and so far working good till 10.14 but it's no longer working on Catalina (10.15). On Catalina it is no longer able to create Input sources and it is always empty -

+ (void) showHideVirtualKeyboard:(BOOL) shouldShow {


    NSDictionary *property = [NSDictionary dictionaryWithObject:(NSString*)kTISTypeKeyboardViewer
                                                         forKey:(NSString*)kTISPropertyInputSourceType];
    NSLog(@"showHideVirtualKeyboard my dictionary is - %@",property);
    NSArray *sources = (__bridge NSArray*)TISCreateInputSourceList((__bridge CFDictionaryRef)property, false);
    if([sources count] == 0) {
        DBLogError(@"ToggleKeyboard: no input keyboard source type found...");
        DBLogError(@"ToggleKeyboard: Trying to create keyboard soruce type");
        sources = (__bridge NSArray*)TISCreateInputSourceList((__bridge CFDictionaryRef)property, true);
        if ([sources count]==0) {
            DBLogError(@"ToggleKeyboard: Still can't find any input sources so nothing to...");
            if(sources)
                CFRelease((CFTypeRef)sources);
            return;
        }
    }

    TISInputSourceRef keyboardViewer = (__bridge TISInputSourceRef)[sources objectAtIndex:0];
    //DBLogInfo(@"********** received sources are %@",keyboardViewer);
    int osStatus;
    //let's show hide keyboard
    if (shouldShow == YES){
        CFBooleanRef enabled = TISGetInputSourceProperty(keyboardViewer, kTISPropertyInputSourceIsEnabled);
        if (enabled == kCFBooleanFalse)
            TISEnableInputSource(keyboardViewer);
        // DBLogInfo(@"kTISPropertyInputSourceIsEnabled = %@",(enabled == kCFBooleanFalse)?@"false":@"true");
        osStatus = TISSelectInputSource(keyboardViewer);
    }
    else
        osStatus = TISDeselectInputSource(keyboardViewer);

    if(osStatus !=noErr)
        DBLogInfo(@"ToggleKeyboard: Received errored OSStatus and it is (%d) ",osStatus);
    if(sources)
        CFRelease((CFTypeRef)sources);
}

请告知是否有人遇到过类似的问题，并且有任何解决方案/解决方法可用.

Please advise if anybody has faced similar issue and any solution / workaround is available.

谢谢.

推荐答案

对于Catalina，Apple现在使用辅助功能键盘作为虚拟键盘(键盘查看器).我想办法以编程方式显示此内容的唯一方法似乎是使用Apple Script.

With Catalina, Apple is now using the Accessibility Keyboard as the virtual keyboard (Keyboard Viewer). And the only way that I could figure out to show this programmatically seems to be with an Apple Script.

这样的事情应该起作用(可以用NSAppleScript调用或通过从C/C ++代码执行osascript来调用)

Something like this should work(can be invoked with NSAppleScript or by executing osascript from C/C++ code):

activate application "System Preferences"
tell application "System Preferences"
    reveal anchor "Virtual_Keyboard" in pane id "com.apple.preference.universalaccess"
end tell

tell application "System Events"
    tell process "System Preferences"
        repeat 20 times
            if (exists checkbox "Enable Accessibility Keyboard" of tab group 1 of group 1 of window 1) then
                click checkbox "Enable Accessibility Keyboard" of tab group 1 of group 1 of window 1
                exit repeat
            end if
            delay 1
        end repeat
    end tell
end tell
tell application "System Preferences" to quit

请注意，要使用此功能，用户将需要授权您的应用程序使用自动化和可访问性.此外，您的应用还应该在Info.plist中声明目的字符串(NSAppleEventsUsageDescription)

Note that to use this the user will need to authorize your app to use Automation and Accessibility. Further, your app should also declare a purpose string (NSAppleEventsUsageDescription) in the Info.plist

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