可变数组添加数组到指定位置- (void)insertObjects:(NSArray<ObjectType> *)objects atIndexes:(NSIndexSet *)indexes;

NSMutableArray *array = [[NSMutableArray alloc] init];
    for (int i = 0; i < 3; i++) {
        [array addObject:[NSString stringWithFormat:@"%@", @(i)]];
    }
    NSLog(@"---------------- 1");
    for (NSString *value in array) {
        NSLog(@"value = %@", value);
    }
    
    NSArray *arrayTmp = @[@"devZhang", @"iOSZhang"];
    // NSMakeRange(1, 2)：1表示要插入的位置，2表示插入数组的个数
    NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(1, 2)];
    [array insertObjects:arrayTmp atIndexes:indexSet];
    NSLog(@"---------------- 2");
    for (NSString *value in array) {
        NSLog(@"value = %@", value);
    }
    
    arrayTmp = @[@"国寿", @"汇安达", @"远光软件", @"惠卡世纪"];
    NSInteger index = [array indexOfObject:@"2"];
    indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(index + 1, 4)];
    [array insertObjects:arrayTmp atIndexes:indexSet];
    NSLog(@"---------------- 3");
    for (NSString *value in array) {
        NSLog(@"value = %@", value);
    }

2018-08-30 11:37:31.873428+0800 demo[9796:127799] ---------------- 1
2018-08-30 11:37:31.873629+0800 demo[9796:127799] value = 0
2018-08-30 11:37:31.873824+0800 demo[9796:127799] value = 1
2018-08-30 11:37:31.873980+0800 demo[9796:127799] value = 2
2018-08-30 11:37:31.874151+0800 demo[9796:127799] ---------------- 2
2018-08-30 11:37:31.874310+0800 demo[9796:127799] value = 0
2018-08-30 11:37:31.874469+0800 demo[9796:127799] value = devZhang
2018-08-30 11:37:31.874587+0800 demo[9796:127799] value = iOSZhang
2018-08-30 11:37:31.874741+0800 demo[9796:127799] value = 1
2018-08-30 11:37:31.874945+0800 demo[9796:127799] value = 2
2018-08-30 11:37:31.875185+0800 demo[9796:127799] ---------------- 3
2018-08-30 11:37:31.875453+0800 demo[9796:127799] value = 0
2018-08-30 11:37:31.875679+0800 demo[9796:127799] value = devZhang
2018-08-30 11:37:31.876041+0800 demo[9796:127799] value = iOSZhang
2018-08-30 11:37:31.876368+0800 demo[9796:127799] value = 1
2018-08-30 11:37:31.876695+0800 demo[9796:127799] value = 2
2018-08-30 11:37:31.877034+0800 demo[9796:127799] value = 国寿
2018-08-30 11:37:31.877412+0800 demo[9796:127799] value = 汇安达
2018-08-30 11:37:31.877781+0800 demo[9796:127799] value = 远光软件
2018-08-30 11:37:31.878828+0800 demo[9796:127799] value = 惠卡世纪