ios - Text file updated only device is connected with xcode only -

i created text file in ios , stored in data files in following location.sandbox => documents => mylogfile.txt.

this file updates when connected device mac , xcode only.if eject device, , connect again see updated text file. not updated. same old file. log file not updated when disconnected pc. how update text file on time.

my code:

-(void)logme:(nsstring *)mymessage {     nsstring *content = mymessage;      //get file path     nsstring *documentsdirectory = [nssearchpathfordirectoriesindomains (nsdocumentdirectory, nsuserdomainmask, yes) objectatindex:0];     nsstring *filename = [documentsdirectory stringbyappendingpathcomponent:@"locationlog.txt"];      //create file if doesn't exist     if(![[nsfilemanager defaultmanager] fileexistsatpath:filename])         [[nsfilemanager defaultmanager] createfileatpath:filename contents:nil attributes:nil];      //append text file (you'll want add newline every write)     nsfilehandle *file = [nsfilehandle filehandleforupdatingatpath:filename];     [file seektoendoffile];     [file writedata:[content datausingencoding:nsutf8stringencoding]];     [file closefile]; } 

and called log file like,

[self logme:myhtml];