NSLog输出Array/Dictionary中文乱码的问题

头回见到让手写这个代码的...

 NSMutableString *str = [[NSMutableString alloc] initWithFormat:@"{\n"];
 [dict enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
     [str appendFormat:@"\t%@ : \"%@\"; \n", key, obj];
 }];
 [str appendFormat:@"}"];
 NSLog(@"%@", str);