NSLog will NOT output from the ViewController class, but WILL from the AppDelegate class. iOS:Objective C

Question

I am facing a strange issue from last few days. NSLog doesn't show anything in the debugger area. This issue is strange because NSLog is working perfectly upto appDelegate. I have some NSLog statements in didFinishLaunching method and these logs are shown in the console. Any NSLog statements after this point is simply skipped.

I searched for any redefinitions like #define NSLog(...). But i couldn't find any. Then I checked if the console is deactivated. Pressing Shift +  + C, but it didn't help.

Also, the debugger is set to show All output.

If the app crashes,it normally used to show something like : Terminating app...Reason:... But now the app simply crashes. It doesn't show anything. So, after appDelegate, the console is dead.

What can be the issue? Anybody faced this before?

EDIT: The following is a similar issue. https://teamtreehouse.com/community/nslog-will-not-output-from-the-viewcontroller-class-but-will-from-the-appdelegate-class

@AayushKatiyar what code are you talking about?The app works normal.It simply skips the NSLog statements after launching.It will work perfectly upto appDelegate. — abhimuralidharan, Apr 19 '16 at 10:47
@TarunSeera it simply skips the NSLog statements.I tried adding a breakpoint before and after an nslog statement.Nothing happens. — abhimuralidharan, Apr 19 '16 at 10:49
Are you sure you are actually logging something? Which libraries are you using? — Sulthan, Apr 19 '16 at 10:49
`NSLog` could also be redefined by a global function in Swift? — Sulthan, Apr 19 '16 at 10:50
@Sulthan I have logs for all apis that I am calling.None of them are working now.Googles IMA and admob are the two framework I have added recently. — abhimuralidharan, Apr 19 '16 at 10:52
Do you have anything like this in your .pch file? #define NSLog ,this basically replaces NSLog with nothing when it's compiled. — , Apr 19 '16 at 10:54
There is only one .pch file for SDWebImage framework.There I don't see anything like this. — abhimuralidharan, Apr 19 '16 at 10:55
When you say nothing happens on a breakpoint, do you mean it doesn't break, or does it break but it doesn't print the log? — EmilioPelaez, Apr 19 '16 at 10:55
@EmilioPelaez it doesn't print anything.`NSLog(@"HELLO WORLD");` will be simply skipped. — abhimuralidharan, Apr 19 '16 at 10:58
Yes, but do the breakpoints pause the execution or are they skipped? — EmilioPelaez, Apr 19 '16 at 11:00
Please add breakpoint at line that has `NSLog` command, to make sure that line is executed. I think your app is crashed so your NSLog doesn't show anything? — Martin Le, Apr 19 '16 at 11:01
@matiboo I am not complaining about the crash.That I mentioned to say that the console is dead after appdelegate.it shows nothing. — abhimuralidharan, Apr 19 '16 at 11:02
@EmilioPelaez The line is executed. breakpoints pause the execution. — abhimuralidharan, Apr 19 '16 at 11:03
@abhi1992 so please add breakpoints like i said in other files ? — Martin Le, Apr 19 '16 at 11:03
If the line is skipped, that most likely it is not there. Look into the preprocessed output (you can open it using of the Xcode menus). Check that `NSLog` is really there. — Sulthan, Apr 19 '16 at 11:08
xcode menus?it is working in appdelegate right.I didn't get your point. — abhimuralidharan, Apr 19 '16 at 11:15
May be this can help: http://stackoverflow.com/questions/7271528/how-to-nslog-into-a-file — Andrew Romanov, Apr 19 '16 at 11:18

score 3 · Accepted Answer · answered Apr 20 '16 at 08:42

3

If you are able to print the logs in AppDelegate and if this issue comes after the app has launched,then the issue should be in the didFinishLaunchingWithOptions method. Just check for any unwanted code inside this method.I had the same issue.

answered Apr 20 '16 at 08:42

Abin Baby

586
6
17

Yeah,I had some code inside `didFinishLaunchingWithOptions ` to generate a .log file.The code is working fine when I removed that. – abhimuralidharan Apr 20 '16 at 09:16

NSLog will NOT output from the ViewController class, but WILL from the AppDelegate class. iOS:Objective C

1 Answers1