Getting Crash Logs Directly From a Device Without Xcode
Your users can retrieve crash reports from their device and send them to you via email by following these instructions.
(It is not possible to get device console logs directly from a device)
1) Open Settings app
2) Go to Privacy, then Diagnostics & Usage
3) Select Diagnostics & Usage Data
4) Locate the log for the crashed app. The logs will be named in the format:
5) Select the desired log. Then, using the text selection UI select
the entire text of the log. Once the text is selected, tap Copy
6) Paste the copied text to Mail and send to an email address as desired
Getting Crash Logs and Console Output From a Device Using Xcode
Even though you won't be able to run the app in Xcode's debugger,
Xcode can still give you all the information you need to debug the
problem.
Using Xcode 6
1) Plug in the device and open Xcode
2) Choose Window -> Devices from the menu bar
3) Under the DEVICES section in the left column, choose the device
4) To see the device console, click the up-triangle at the bottom left of the right hand panel
5) Click the down arrow on the bottom right to save the console as a file
6) To see crash logs, select the View Device Logs button under the Device Information section on the right hand panel
7) Find your app in the Process column and select the Crash log to see the contents.
8) To save a crash log, right click the entry on the left column and choose "Export Log"
9) Xcode 6 will also list low memory logs here. These will be shown
with a Process name "Unknown" and Type "Unknown". You should examine the
contents of these logs to determine whether any of these are caused by
your app. For more information about low memory logs, see Understanding
and Analyzing iOS Application Crash Reports.
Using Xcode 5
1) Plug in the device and open Xcode
2) Open the Organizer window and select the Devices tab
3) Under the DEVICES section in the left column, expand the listing for the device
4) Select Device Logs to see crash logs or select Console to see Console output
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Enabling App Store Diagnostic Reporting
Crash logs are automatically collected from customers who have opted in to sending diagnostic and usage information to Apple.
Beginning with Xcode 6.3, crash logs from App Store customers running
at least iOS 8.3 and TestFlight beta testers can be found in the Xcode
Organizer. To obtain these crash logs:
1) Open the Organizer window in Xcode 6.3 and above
2) Select "Crashes" at the top. The available crash logs can then be found within this window.
The App Distribution Guide contains further information about the Crash Reporting service.
Crash reports from customers running older iOS versions may be found in iTunes Connect.
If someone is reporting a crash, and you do not see a corresponding
report in iTunes Connect, you should direct them to the following
knowledge base articles for Mac or for Windows so they can opt-in to
sending you crash reports.
for android -user can use monitor file from sdk folder else using adb logcat he can check logs in command prompt