Xcode 警告信息处理：Format string is not a string literal (potentially insecure)

转自：http://www.oschina.net/question/54100_33881

NSObject *obj = @"A string or other object.";
NSLog([NSString stringWithFormat:@"%@",obj]);// 有警告
NSLog([NSString stringWithFormat:@"%@",obj],nil);// 解决方案