定位Section的FooterView

@interface ZZTestViewController ()<UITableViewDelegate, UITableViewDataSource>
@property (weak, nonatomic) IBOutlet UITableView *myTableView;
@property (strong, nonatomic) NSArray *dataArray;
@property (strong, nonatomic) ZZTestFooterView *footerView;

@end

@implementation ZZTestViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self initWithUI];
    // Do any additional setup after loading the view from its nib.
}

- (void)initWithUI {
    self.navigationItem.title = @"分類";
    _dataArray = @[@"I", @"II", @"II", @"IV"];
    [self initWithTableView];
    
}

- (void)initWithTableView {
    self.myTableView.dataSource = self;
    self.myTableView.delegate = self;
    [self.myTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cellId"];
    self.myTableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
    
}

#pragma mark UITableViewDelegate, UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 1;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return _dataArray.count;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return 50;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
    return 100;
}

- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {
    
    UIView *base = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 100)];

    _footerView = [[NSBundle mainBundle] loadNibNamed:@"ZZTestFooterView" owner:nil options:nil][0];
    
    //footerView的按鈕tag回調
    __weak typeof(self) weakSelf = self;
    [_footerView selectCategory:^(NSInteger tag) {
        __strong typeof(weakSelf) strongSelf = weakSelf;
        [strongSelf seleWithCategory:tag withIndex:section];
    }];
    
    [base addSubview:_footerView];
    
    return base;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cellId"];
    cell.textLabel.text = _dataArray[indexPath.section];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

#pragma mark footerView 的按鈕點擊
- (void)seleWithCategory:(NSInteger)tag withIndex:(NSInteger)index {
    //index-->section
    NSLog(@"%ld", index);
}