解决xcode8控制台不打印情况.

#ifdef DEBUG
#define LRString [NSString stringWithFormat:@"%s", __FILE__].lastPathComponent
#define NSLog(...) printf("%s 第%d行: %s\n\n", [LRString UTF8String] ,__LINE__, [[NSString stringWithFormat:__VA_ARGS__] UTF8String]);
#else
#define NSLog(...)
#endif