iOS 打log

+ (void)file:(char*)sourceFile function:(char*)functionName lineNumber:(int)lineNumber format:(NSString*)format, ...
{
    @autoreleasepool {
        va_list ap;
        NSString *print, *file, *function;
        va_start(ap,format);
        file = [[NSString alloc] initWithBytes: sourceFile length: strlen(sourceFile) encoding: NSUTF8StringEncoding];
        function = [NSString stringWithCString:functionName encoding:NSUTF8StringEncoding];
        print = [[NSString alloc] initWithFormat: format arguments: ap];
        va_end(ap);
        NSLog(@"%@:%d %@; %@", [file lastPathComponent], lineNumber, function, print);
    }
}