问题
I made a custom iOS8 keyboard but I need to detect which app is using the keyboard.
f.e. I need to know if its Whatsapp or just normal Messages to handle a different logic.
I haven't found any related question on this. And frankly I don't think this is possible, or even allowed by Apple.
The closest other Q/A I could find was this.
来源：https://stackoverflow.com/questions/27125299/ios8-custom-keyboard-detect-which-app-is-using-keyboard