objective c - iOS: NSLogger not writing to file on disk -

i'm trying implement nslogger framework framework. add nslogger project , configure project. here implementation:

#import "appdelegate.h" #import <nslogger/nslogger.h> @interface appdelegate () @end @implementation appdelegate - (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {     nsurl *pathdirectory = [[[nsfilemanager defaultmanager] urlsfordirectory:nsdocumentdirectory                                                                    indomains:nsuserdomainmask] lastobject];     cfstringref path = (__bridge cfstringref)[pathdirectory.path stringbyappendingstring:@"/logs.txt"];     logger *logger = loggerinit();     loggersetoptions(logger,kloggeroption_bufferlogsuntilconnection |                      kloggeroption_capturesystemconsole |                      kloggeroption_browsebonjour |                      kloggeroption_browseonlylocaldomain);     loggersetupbonjour(logger, null, null);     loggersetbufferfile(logger, path);     loggerapp(1, @"hello world! today is: %@", [nsdate date]);     loggerapp(0, @"hello world! today is: %@", [nsdate date]);     logmessage(@"map view loaded", 0, @"map view loaded");     logmessage(@"map view loaded", 1, @"map view loaded");     logmessagef(nil,50,nil,@"tag mapvc",1,@"testing format");     logmessagef(nil,50,nil,@"level 0",0,@"testing format");     logmessagef(nil,50,nil,@"level 0",0,@"testing format");     return yes; } 

everything compiling , running nothing writing logs.txt file. of knows why not writing file or i'm doing wrong?

i'll appreciate help