搜索框UISearchController的使用(iOS8.0以后替代UISearchBar + UISearchDisplayController）

Posted 2020-06-13

1.searchResultsUpdater：设置显示搜索结果的控制器

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1	_mySearchController.searchResultsUpdater = self;

 

2.dimsBackgroundDuringPresentation：设置开始搜索时背景显示与否

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1	_mySearchController.dimsBackgroundDuringPresentation = NO;

 

3.[searchBar sizeToFit]:设置searchBar位置自适应

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1	[_mySearchController.searchBar sizeToFit];

 

4.设置searchBar为UITableView的头部视图

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1	self.myTableView.tableHeaderView = self.mySearchController.searchBar;

 

5.UISearchResultsUpdating:代理方法

#import "SearchViewController.h"

@interface ShareViewController ()<UISearchResultsUpdating,UITableViewDataSource,UITableViewDelegate>

@property (nonatomic, strong) UITableView *myTableView;

@property (nonatomic, strong) NSMutableArray *visableArray;//可见的

@property (nonatomic, strong) NSMutableArray *filterArray;//滤波器

@property (nonatomic, strong) NSMutableArray *dataSourceArray;

@property (nonatomic, strong) UISearchController *mySearchController;

 

@end

 

@implementation SearchViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    

    [self initial];

}

 

- (void)initial{

    self.dataSourceArray = [NSMutableArray array];

    self.filterArray = [NSMutableArray array];

    for (int i = 0; i < 26; i++) {

        for (int j = 0; j < 4; j++) {

            NSString *str = [NSString stringWithFormat:@"%c%d", ‘A‘+i, j];

            [self.dataSourceArray addObject:str];

        }

    }

    

    self.visableArray = self.dataSourceArray;

    

    self.myTableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];

    _myTableView.delegate = self;

    _myTableView.dataSource = self;

    [self.view addSubview:_myTableView];

    

    self.mySearchController = [[UISearchController alloc] initWithSearchResultsController:nil];

    _mySearchController.searchResultsUpdater = self;

    _mySearchController.dimsBackgroundDuringPresentation = NO;

    [_mySearchController.searchBar sizeToFit];

    

    self.myTableView.tableHeaderView = self.mySearchController.searchBar;

}

 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    if (!_visableArray || _visableArray.count == 0) {

        _visableArray = _dataSourceArray;

    }

    return _visableArray.count;

}

 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"identifier"];

    

    if (!cell) {

        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"identifier"];

    }

    

    cell.textLabel.text = [_visableArray objectAtIndex:indexPath.row];

    

    return cell;

}

 

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{

    NSString *filterString = searchController.searchBar.text;

    

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains [c] %@", filterString];

    

    self.visableArray = [NSMutableArray arrayWithArray:[self.dataSourceArray filteredArrayUsingPredicate:predicate]];

    

    [self.myTableView reloadData];

}