在自定义操作表中无法点击“取消”按钮

Question

Refer to link UIAlertController - add custom views to actionsheet for my UI layout.

I have the same layout of custom action sheet in my app. The code is written in the same way. I noticed that in swift4 the "Cancel" button does not perform any action. When I tap on "Cancel" button in code below

let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: {(alert: UIAlertAction!) in 
     print("Cancel")
})

The code: print(Cancel") does not execute.

Answer 1

I think you have a problem with a frame of the custom view.
Run you application on a simulator and press "Debug View Hierarchy":

After that you'll can exam frames of views.

Answer 2

Try this handler

UIAlertAction(title: "Cancel", style: .cancel, handler: { (action) -> Void in
            print("cancel")
        }))