How can I get the console logs from the iOS Simulator

Question

I want to see what happens in the iOS Simulator if I m not testing the app in Xcode   For example  if I open a link in the Safari simulator  see what happens in the console  or if I install a web-app  see the links that I m pressing in console   How can I do this   I want to see it in Xcode or Terminal  but it s not a problem if I need to use another bit of software

User · Answer

No NSLog or print content will write to system log  which can be open by Select Simulator - gt  Debug - gt  Open System log on Xcode 11    I figure out a way  write logs into a file and open the xx log with Terminal app Then the logs will present in Terminal app lively   I use CocoaLumberjack achieve this   STEP 1   Add DDFileLogger DDOSLogger and print logs path  config   should be called when App lunch   static func config          if DEBUG     DDLog add DDOSLogger sharedInstance     Uses os log     let fileLogger  DDFileLogger   DDFileLogger      File Logger     fileLogger rollingFrequency   60   60   24    24 hours     fileLogger logFileManager maximumNumberOfLogFiles   7     DDLog add fileLogger      DDLogInfo  DEBUG LOG PATH       fileLogger currentLogFileInfo  filePath              endif     STEP 2   Replace print or NSLog with DDLogXXX   STEP 3     tail -f  path of log    Here  message will present in Terminal app lively      One thing more  If there is no any message log out  make sure Environment Variables -  OS ACTIVITY MODE ISNOT disable

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You should not rely on instruments -s  The officially supported tool for working with Simulators from the command line is xcrun simctl   The log directory for a device can be found with xcrun simctl getenv booted SIMULATOR LOG ROOT  This will always be correct even if the location changes   Now that things are moving to os log it is easier to open Console app on the host Mac  Booted simulators should show up as a log source on the left  just like physical devices  You can also run log commands in the booted simulator     os log equivalent of tail -f xcrun simctl spawn booted log stream --level debug    filter log output xcrun simctl spawn booted log stream --predicate  processImagePath endswith  myapp   xcrun simctl spawn booted log stream --predicate  eventMessage contains  error  and messageType    info     a log dump that Console app can open xcrun simctl spawn booted log collect    open location where log collect will write the dump cd  xcrun simctl getenv booted SIMULATOR SHARED RESOURCES DIRECTORY    If you want to use Safari Developer tools  including the JS console  with a webpage in the Simulator  Start one of the simulators  open Safari  then go to Safari on your mac and you should see Simulator in the menu   You can open a URL in the Simulator by dragging it from the Safari address bar and dropping on the Simulator window  You can also use xcrun simctl openurl booted  lt url gt

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XCode   6 0 AND iOS   8 0 The below script works if you have XCode version   8 0  I use the below small Script to tail the simulator logs onto the system console      bin sh sim dir  xcrun instruments -s   grep  iPhone 6  8 2 Simulator     awk   print  NF     tr -d       tail -f   Library Logs CoreSimulator  sim dir system log   You can pass in the simulator type used in the Grep as an argument  As mentioned in the above posts  there are simctl and instruments command to view the type of simulators available for use depending on the Xcode version  To View the list of available devices simulators   xcrun instruments -s   OR   xcrun simctl list   Now you can pass in the Device code OR Simulator type as an argument to the script and replace the  iPhone 6  8 2 Simulator   inside grep to be  1

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Download the safari technology review   With the simulator running  select develop  gt  simulator  gt  localhost

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tailing  var log system log didn t work for me  I found my logs by using Console app  They were in    Library Logs iOS Simulator  version  system log

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iOS 8 and iOS 9  Under iOS 8 and iOS 9 this location is now     Library Logs CoreSimulator  lt DEVICE CODE gt    So  the following will work   tail -f   Library Logs CoreSimulator  lt DEVICE CODE gt  system log   The DEVICE CODE value can be found via the following console command   instruments -s devices

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You can view the console for the iOS Simulator via desktop Safari  It s similar to the way you use desktop Safari to view the console for physical iOS devices   Whenever the simulator is running and there s a webpage open  there ll be an option under the Develop menu in desktop safari that lets you see the iOS simulator console   Develop -  iPhone Simulator -  site name

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If you are using Swift  remember that println will only print to the debug log  which appears in xCode s debug area   If you want to print to system log  you have to use NSLog as in the old days   Then you can view the simulator log via its menu  Debug   Open System Log     cmd

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You can see the Simulator console window  including Safari Web Inspector and all the Web Development Tools by using the Safari Technology Preview app  Open your page in Safari on the Simulator and then go to Safari Technology Preview   Develop   Simulator

User · Answer

There s an option in the Simulator to open the console  Debug  gt  Open System Log   or use the  keyboard shortcut

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iOS Simulator   Menu Bar   Debug   Open System Log    Old ways   iOS Simulator prints its logs directly to stdout  so you can see the logs mixed up with system logs    Open the Terminal and type  tail -f  var log system log  Then run the simulator   EDIT   This stopped working on Mavericks Xcode 5  Now you can access the simulator logs in its own folder    Library Logs iOS Simulator  lt sim-version gt  system log  You can either use the Console app to see this  or just do a tail  iOS 7 0 3 64 bits for example    tail -f   Library Logs iOS  Simulator 7 0 3-64 system log  EDIT 2   They are now located in   Library Logs CoreSimulator  lt simulator-hash gt  system log  tail -f   Library Logs CoreSimulator  lt simulator-hash gt  system log

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In Xcode  View- gt Debug Area- gt Activate Console

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iOS Logger  You can use the Console application select your device in Devices  on your Mac to see a log message that were sent using NSLog  os log  Logger  you will not see logs from print function   Also please check  Action - gt  Include  lt Info Debug gt  Messages   Please note that if you want to see a log from WebView UIWebView or WKWebView  you should use Safary - gt  Develop - gt  device  Find crash log

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I can open the log directly via the iOS simulator  Debug - gt  Open System Log    Not sure when this was introduced  so it might not be available for earlier versions

[ios] How can I get the console logs from the iOS Simulator?

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