for line of codes :
find . "(" -name ".m" -or -name ".mm" -or -name "*.cpp" ")" -print0 | xargs -0 wc -l
for number of files :
//you need to write this code
NSFileManager *filemgr = [NSFileManager defaultManager];
NSArray *filelist= [filemgr directoryContentsAtPath: yourPath];
int count = [filelist count];
NSLog ("%i",count);
for number of functions :
No tool or code in my knowledge
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solved Tool for counting total files,functions and number of lines in iphone application [closed]