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
2024-01-18 16:08:34
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