数据源循环NSIndexSet

  测试数据：

  NSArray *arrs =@[@0,@1,@2,@3,@4,@5,@6,@7,@8,@9,@10];

    NSMutableArray *arr = [arrsmutableCopy];

    NSIndexSet *indexSet = [NSIndexSetindexSetWithIndexesInRange:NSMakeRange(0, arr.count -5)];

    NSArray *preArr = [arrobjectsAtIndexes:indexSet];

    [arr removeObjectsAtIndexes:indexSet];

    [arr addObjectsFromArray:preArr];

断点打印结果：