Essential Books

Using FUNCTION

suggest change 
NSLog(@"%s %@",__FUNCTION__, @"etc etc");

Inserts the class and method name into the output: 

2016-07-22 12:51:30.099 loggingExample[18132:2971471] -[ViewController viewDidLoad] etc etc
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Logging:
* Logging
* Logging
* NSLog Output Format
* Logging Variable Values
* Removing Log Statements from Release Builds
* Empty message is not printed
* Using FUNCTION
* NSLog vs printf
* Logging NSLog meta data
* NSLog and BOOL type
* Logging by Appending to a File
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