搜索欄 UISearchController

#import "ViewController.h"

@interface ViewController ()<</span>UITableViewDelegate, UITableViewDataSource, UISearchResultsUpdating >

@property (nonatomic,strong) UISearchController *searchController;
//StoryBoard創建的tableView
@property (strong, nonatomic) IBOutlet UITableView *tableView;
//數據源數組
@property (nonatomic,strong) NSMutableArray *dataList;
//搜索到數據數組
@property (nonatomic,strong) NSMutableArray *searchList;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
   
    [self createSearchBar];
   
    [self createData];
}

- (void)createSearchBar{
    self.searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
    //設置顯示搜索的控制器
    self.searchController.searchResultsUpdater = self;
    // 設置開始搜索時背景顯示與否(default is YES)
    self.searchController.dimsBackgroundDuringPresentation = NO;
    //展示時是否隱藏naviBar (default is YES)
    self.searchController.hidesNavigationBarDuringPresentation = NO;
}

- (void)createData{
    //將搜索欄設置爲tableView的頭部視圖
    self.tableView.tableHeaderView = self.searchController.searchBar;
    //tableView代理
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    //初始化數據源數組
    self.dataList = [NSMutableArray arrayWithCapacity:0];
   
    for (NSInteger i = 0; i < 100; i++) {
    [self.dataList addObject:[NSString stringWithFormat:@"騷軍 %ld號",i]];
    }
}
//tableView @required
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
   
    if (self.searchController.active) {
        return self.searchList.count;
    }
    return self.dataList.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
   
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
   
    if (cell == nil) {
        cell = [[UITableViewCell alloc]initWithStyle:(UITableViewCellStyleDefault) reuseIdentifier:@"cell"];
    }
    if (self.searchController.active) {
        [cell.textLabel setText:self.searchList[indexPath.row]];
    }else{
        [cell.textLabel setText:self.dataList[indexPath.row]];
    }
    return cell;
}

//updataSearchTesultsForSearchController 進行過濾
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{
    //獲取searchBar搜索的內容
    NSString *searchString = self.searchController.searchBar.text;
    //謂詞
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", searchString];
   
    //判斷搜索數組是否爲空
    if (self.searchList != nil) {
        [self.searchList removeAllObjects];
    }
    //使用謂詞過濾數據
    self.searchList = [NSMutableArray arrayWithArray:[_dataList filteredArrayUsingPredicate:predicate]];
    //刷新
    [self.tableView reloadData];

}

@end