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

Answer 2

Open viewController.swift file for initial view in the standard editor and print something inside viewDidLoad and run application.. if the print is working properly, now make sure you have selected viewController.swift file correctly in the assistant editor.

Answer 3

In my case breakpoint was not hit in just one callback, so I changed "Swift Compiler" "Optimization Level" to "No optimization" in project target build settings for debug, and it started working in Xcode 9.3 as well as AppCode.

Answer 4

I was also dealing with the same issue in xcode 9.

I resolved the issue in below ways:

• Remove XCode defaults Using below terminal command

  defaults delete com.apple.dt.Xcode.LSSharedFileList   
  defaults delete com.apple.dt.Xcode
  

• Clear(or delete) Xcode's DerivedData from

  /Users/[Your Mac Username]/Library/Developer/Xcode/DerivedData
  

• Delete(or uninstall) Xcode.app from Applications and then restart PC

• Install fresh copy of Xcode 9

• [Mandatory] Set user permission to your app project like

  chmod -R 777 "/Users/[Your Mac Username]/Desktop/TestApp/"
  

  [where TestApp is the app project keeping on Desktop]

• Open the project and check Build Settings are set to Debug

• Make sure breakpoints are enabled and set debug point in your code

Answer 5

What helped for me was deleting the file Breakpoints_v2.xcbkptlist which is located under the project directory (*.xcodeproj) in the directory: xcuserdata/Fred.xcuserdatad/xcdebugger (replace "Fred" with your username). Use a terminal program to go there.

Answer 6

I solved this by going to my Xcode project's 'Build Settings' and setting 'Generate Debug Symbols' to 'Yes'