混合objective-c和swift：致命错误：使用未实现的初始化程序'init（target：action :)'进行类

my code contains both objective-c and swift classes and so far, everything worked pretty well. however, i added a custom gesture recognizer that inherits from UIGestureRecognizer. My code compiles but when I try to run it I get the following error:my code contains both objective-c and swift cla