Eren

This is an awesome project.Thank you for your contribution.  centre--->center

问题代码: ``` [rowNodes removeObject:[NSNull null]]; ``` 可以修改为 ``` NSMutableArray *array = rowNodes.mutableCopy; for (id data in array) { if ([data isKindOfClass:[NSNull class]]) { [rowNodes removeObject:data]; } } ```