Objective-C索引集NSIndexSet与可变索引集NSMutableIndexSet使用
//创建空arrayNSMutableArray*emptyArray=[NSMutableArrayarray];[emptyArrayaddObjectsFromArray:[marrsubarrayWithRange:NSMakeRange(6,5)]];[marrremoveAllObjects];NSLog(@"%@",emptyArray);//创建索引集NSIndexSet*inde