Example

//
//  ViewController.m
//  TEST
//
//  Created by Karol Kurek on 02.11.2017.
//  Copyright © 2017 Karol Kurek. All rights reserved.
//

#import "ViewController.h"

@interface ViewController () <UITableViewDelegate, UITableViewDataSource, UISearchResultsUpdating, UISearchControllerDelegate, UISearchBarDelegate>
@property (nonatomic, strong) NSMutableArray<NSArray<NSString *> *> *someData;
@property (nonatomic, strong) NSMutableArray<NSArray<NSString *> *> *filteredData;
@property (nonatomic, strong) UITableView *tableView;
@end

@implementation ViewController

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        self.tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
        [self.tableView setSeparatorStyle:UITableViewCellSeparatorStyleNone];
        [self.tableView setBackgroundColor:[UIColor clearColor]];
        self.someData = [NSMutableArray array];
        [self.someData addObject:[NSArray arrayWithObjects:@"a",@"b",@"c", nil]];
        [self.someData addObject:[NSArray arrayWithObjects:@"a",@"b",@"c", nil]];
        [self.someData addObject:[NSArray arrayWithObjects:@"a",@"b",@"c", nil]];
        [self.someData addObject:[NSArray arrayWithObjects:@"a",@"b",@"c", nil]];
        self.tableView.showsVerticalScrollIndicator = NO;
        self.filteredData = [NSMutableArray array];
    }
    return self;
}

- (void)loadView {
    [super loadView];
    [self.tableView setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    self.tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    self.tableView.translatesAutoresizingMaskIntoConstraints = NO;

    self.tableView.estimatedRowHeight = 85.0;
    self.tableView.rowHeight = UITableViewAutomaticDimension;

    [self.view addSubview:self.tableView];
}

- (void)viewDidLoad {
    [super viewDidLoad];

    UISearchController * search = [[UISearchController alloc] initWithSearchResultsController:nil];
    search.searchResultsUpdater = self;

    self.navigationItem.searchController = search;
    self.navigationItem.hidesSearchBarWhenScrolling = YES;
    self.navigationItem.searchController.searchBar.barTintColor = [UIColor blueColor];
    self.navigationItem.searchController.searchBar.delegate = self;

    UITextField *textField = [self.navigationItem.searchController.searchBar valueForKey:@"searchField"];
    UIView *backgroundView = textField.subviews.firstObject;
    backgroundView.backgroundColor = [UIColor whiteColor];
    backgroundView.layer.cornerRadius = 10;
    backgroundView.clipsToBounds = YES;

}

- (NSMutableArray<NSArray<NSString *> *> *)currentTableData {
    if([self.filteredData count] && [self.filteredData[0] count]){
        return self.filteredData;
    }else{
        return self.someData;
    }
    return nil;
}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return [[self currentTableData] count];
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [[self currentTableData][section] count];
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"reuse"];
    [[cell textLabel] setText:[self currentTableData][indexPath.section][indexPath.row]];

    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];

    return cell;
}

-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
    return [UIView new];

}

-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    return CGFLOAT_MIN;
}

-(CGFloat)tableView:(UITableView*)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath*)indexPath{
    return [self getHeightForCellInTableView:tableView andIndexPath:indexPath];
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return [self getHeightForCellInTableView:tableView andIndexPath:indexPath];
}

-(CGFloat)getHeightForCellInTableView:(UITableView *)tableView andIndexPath:(NSIndexPath *)indexPath{
    return 40;
}

-(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section{
    return [UIView new];
}
-(CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{
    return 0.1f;
}

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {
    self.filteredData = [self filterContentForSearchText:searchController.searchBar.text];

    [self.tableView reloadData];
}

- (NSMutableArray<NSArray<NSString *> *> *)filterContentForSearchText:(NSString *)text {
    NSMutableArray<NSArray<NSString *> *> *sections = [NSMutableArray array];

    for (NSArray *section in self.currentTableData) {
        NSArray *objects = [section filteredArrayUsingPredicate:[self predicateForSearching:text]];

        if ([objects count] > 0) {
            [sections addObject:[NSArray arrayWithArray:objects]];
        }
    }

    return sections;
}

- (NSPredicate *)predicateForSearching:(NSString *)text {
    return [NSPredicate predicateWithBlock:^BOOL(id  _Nullable evaluatedObject, NSDictionary<NSString *,id> * _Nullable bindings) {
        if ([evaluatedObject isKindOfClass:[NSString class]]) {
            return [((NSString *)evaluatedObject) containsString:text];
        }

        return NO;
    }];
}

@end