1.searchResultsUpdater：设置显示搜索结果的控制器
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2.dimsBackgroundDuringPresentation：设置开始搜索时背景显示与否
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3.[searchBar sizeToFit]:设置searchBar位置自适应
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4.设置searchBar为UITableView的头部视图
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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];
}