Xcode 8 Breakpoint in file not working

Question

I have one file,SignInViewController.swift, in my Xcode project that out of nowhere has begun not stopping on breakpoints. I have a breakpoint in viewDidL

Answer 1

Sometimes the values may have changed in Xcode userdefaults itself, At times, I had similar issue with debugger stopping at stacktrace Few ways to clear this

1.Delete the Xcode preference
defaults delete com.apple.dt.Xcode

Other Issue could be the optimization level for the target, changing it to none will stop at the debugger