I have followed all procedure same as given in developer google for Google sign in but at the last when they said to connect the outlets, unfortunately, I am unable to do so, please guide me.

I have followed all procedure same as given in developer google for Google sign in but at the last when they said to connect the outlets, unfortunately, I am unable to do so, please guide me.

On
comment that outlet and start toctrl+drag from that button to that class. from popup give outlet name what you want (exa: singninButton) and press connect. and make sure in assistant editor there is a class opened that you have set to that viewcontroller. hope this will help :)
On
I downloaded this demo from GitHub, and I noticed that GIDSignInButton is not a UIButton but a UIView. So you may consider using UIView instead of UIButton.
please change its class first in the button settings from the UIButton to GIDSignInButton -> like here