As @Abhishek comments, you will need to use some monitoring tools crashlyticsto get this information.
Fabric is a good option in this case. It comes with crashlytics .
Here is a blog post that explains in detail how to configure it for your application.
Here is an excerpt from the features of the tool of the crustaltic fabric tool from the blog
. . , iTunes Connect, , iPhone. ( ).
- (A.K.A. CLS_LOG) Objective-C, , , "NSLog", . CLS_LOG. Theres , youre ( , , ), , , Crashlyticss , , CLS_LOG. , / , , .