注意:如果出現下邊這種情況

Paste_Image.png

解決方式:在ViewDidLoad新增以下程式碼

- (void)viewDidLoad {

    #warning 如果進入預編輯狀態,searchBar消失(UISearchController套到TabBarController可能會出現這個情況),請新增下邊這句話
    self.definesPresentationContext=YES;
}

實現效果

Paste_Image.png

iOS8之前,使用搜索採用的是:UISearchBar+UIDisplayController;
iOS8之後,採用的是UISearchController,看演示+上程式碼:

demo演示圖

//添加了tableView的代理是為了顯示搜尋的列表
@interface SearchViewController ()<UITableViewDelegate,UITableViewDataSource,
UISearchControllerDelegate,UISearchResultsUpdating>

//searchController
@property (nonatomic,retain) UISearchController *searchController;

//tableView
@property (nonatomic,strong) UITableView *skTableView;

//資料來源
@property (nonatomic,strong) NSMutableArray *dataListArry;
@property (nonatomic,strong) NSMutableArray *searchListArry;
@end
 

- (void)viewDidLoad {
    [super viewDidLoad];

    self.title = @"搜尋列表";

    self.dataListArry = [NSMutableArray array];
    self.searchListArry = [NSMutableArray array];
    self.dataListArry = [NSMutableArray arrayWithCapacity:100];

    //產生100個數字+三個隨機字母
    for (NSInteger i =0; i<100; i++) {

         [self.dataListArry addObject:[NSString stringWithFormat:@"%ld%@",(long)i,[self shuffledAlphabet]]];
    }
    self.skTableView =[[UITableView alloc]initWithFrame:CGRectMake(0, 0,[UIScreen  mainScreen].bounds.size.width ,[UIScreen  mainScreen].bounds.size.height)];

    self.skTableView.delegate = self;
    self.skTableView.dataSource = self;
    //隱藏tableViewCell下劃線
//    self.skTableView.separatorStyle = UITableViewCellSelectionStyleNone;

    //建立UISearchController
    self.searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
    //設定代理
    self.searchController.delegate= self;
    self.searchController.searchResultsUpdater = self;

    //包著搜尋框外層的顏色
    self.searchController.searchBar.barTintColor = [UIColor yellowColor];

    //提醒字眼
    self.searchController.searchBar.placeholder= @"請輸入關鍵字搜尋";

    //提前在搜尋框內加入搜尋詞
    self.searchController.searchBar.text = @"我是周杰倫";


    //設定UISearchController的顯示屬性，以下3個屬性預設為YES

    //搜尋時，背景變暗色
    self.searchController.dimsBackgroundDuringPresentation = NO;
    //搜尋時，背景變模糊
//    self.searchController.obscuresBackgroundDuringPresentation = NO;

    //點選搜尋的時候,是否隱藏導航欄
//    self.searchController.hidesNavigationBarDuringPresentation = NO;

    //位置
    self.searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44.0);

    // 新增 searchbar 到 headerview
    self.skTableView.tableHeaderView = self.searchController.searchBar;

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


//產生3個隨機字母
- (NSString *)shuffledAlphabet {

    NSMutableArray * shuffledAlphabet = [NSMutableArray arrayWithArray:@[@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y",@"Z"]];

    NSString *strTest = [[NSString alloc]init];
    for (int i=0; i<3; i++) {
        int x = arc4random() % 25;
        strTest = [NSString stringWithFormat:@"%@%@",strTest,shuffledAlphabet[x]];
    }
    return strTest;
}

//設定區域的行數
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    if (self.searchController.active) {

        return [self.searchListArry count];
    }
    else{

        return [self.dataListArry count];
    }
}

//返回單元格內容
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *
 
[email protected]"cell";
    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:flag];
    if (cell==nil) {
        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:flag];
    }
    if (self.searchController.active) {
        [cell.textLabel setText:self.searchListArry[indexPath.row]];
    }
    else{
        [cell.textLabel setText:self.dataListArry[indexPath.row]];
    }
    return cell;
}

//謂詞搜尋過濾
-(void)updateSearchResultsForSearchController:(UISearchController *)searchController {

    //    //修改"Cancle"退出字眼,這樣修改,按鈕一開始就直接出現,而不是搜尋的時候再出現
    //    searchController.searchBar.showsCancelButton = YES;
    //    for(id sousuo in [searchController.searchBar subviews])
    //    {
    //
    //        for (id zz in [sousuo subviews])
    //        {
    //
    //            if([zz isKindOfClass:[UIButton class]]){
    //                UIButton *btn = (UIButton *)zz;
    //                [btn setTitle:@"搜尋" forState:UIControlStateNormal];
    //                [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    //            }
    //
    //            
    //        }
    //    }

    NSLog(@"updateSearchResultsForSearchController");
    NSString *searchString = [self.searchController.searchBar text];
    NSPredicate *preicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", searchString];
    if (self.searchListArry!= nil) {
        [self.searchListArry removeAllObjects];
    }
    //過濾資料
    self.searchListArry= [NSMutableArray arrayWithArray:[self.dataListArry filteredArrayUsingPredicate:preicate]];
    //重新整理表格
    [self.skTableView reloadData];
}

#pragma mark - UISearchControllerDelegate代理,可以省略,主要是為了驗證列印的順序
//測試UISearchController的執行過程

- (void)willPresentSearchController:(UISearchController *)searchController
{
    NSLog(@"willPresentSearchController");
}

- (void)didPresentSearchController:(UISearchController *)searchController
{
    NSLog(@"didPresentSearchController");
#warning 如果進入預編輯狀態,searchBar消失(UISearchController套到TabBarController可能會出現這個情況),請新增下邊這句話
//    [self.view addSubview:self.searchController.searchBar];
}

- (void)willDismissSearchController:(UISearchController *)searchController
{
    NSLog(@"willDismissSearchController");
}

- (void)didDismissSearchController:(UISearchController *)searchController
{
    NSLog(@"didDismissSearchController");
}

- (void)presentSearchController:(UISearchController *)searchController
{
    NSLog(@"presentSearchController");
}

demo地址: https://github.com/OwenJoe/UISearchController.git