点击搜索进入预编译状态,searbar跟随导航消失

注意:如果出现下边这种情况

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解决方式:在ViewDidLoad添加以下代码

- (void)viewDidLoad {    #warning 如果进入预编辑状态,searchBar消失(UISearchController套到TabBarController可能会出现这个情况),请添加下边这句话    self.definesPresentationContext=YES;}

实现效果

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iOS8之前,使用搜索采用的是:UISearchBar+UIDisplayController;
iOS8之后,采用的是UISearchController,看演示+上代码:

demo演示图

//添加了tableView的代理是为了显示搜索的列表@interface SearchViewController ()<UITableViewDelegate,UITableViewDataSource,UISearchControllerDelegate,UISearchResultsUpdating>//searchController@property (nonatomic,retain) UISearchController *searchController;//tableView@property (nonatomic,strong) UITableView *skTableView;//数据源@property (nonatomic,strong) NSMutableArray *dataListArry;@property (nonatomic,strong) NSMutableArray *searchListArry;@end

- (void)viewDidLoad {    [super viewDidLoad];    self.title = @"搜索列表";    self.dataListArry = [NSMutableArray array];    self.searchListArry = [NSMutableArray array];    self.dataListArry = [NSMutableArray arrayWithCapacity:100];    //产生100个数字+三个随机字母    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;    //隐藏tableViewCell下划线//    self.skTableView.separatorStyle = UITableViewCellSelectionStyleNone;    //创建UISearchController    self.searchController = [[UISearchController alloc]initWithSearchResultsController:nil];    //设置代理    self.searchController.delegate= self;    self.searchController.searchResultsUpdater = self;    //包着搜索框外层的颜色    self.searchController.searchBar.barTintColor = [UIColor yellowColor];    //提醒字眼    self.searchController.searchBar.placeholder= @"请输入关键字搜索";    //提前在搜索框内加入搜索词    self.searchController.searchBar.text = @"我是周杰伦";    //设置UISearchController的显示属性，以下3个属性默认为YES    //搜索时，背景变暗色    self.searchController.dimsBackgroundDuringPresentation = NO;    //搜索时，背景变模糊//    self.searchController.obscuresBackgroundDuringPresentation = NO;    //点击搜索的时候,是否隐藏导航栏//    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);    // 添加 searchbar 到 headerview    self.skTableView.tableHeaderView = self.searchController.searchBar;    [self.view addSubview: self.skTableView];}//产生3个随机字母- (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;}//设置区域的行数-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    if (self.searchController.active) {        return [self.searchListArry count];    }    else{        return [self.dataListArry count];    }}//返回单元格内容-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *flag=@"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;}//谓词搜索过滤-(void)updateSearchResultsForSearchController:(UISearchController *)searchController {    //    //修改"Cancle"退出字眼,这样修改,按钮一开始就直接出现,而不是搜索的时候再出现    //    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:@"搜索" 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];    }    //过滤数据    self.searchListArry= [NSMutableArray arrayWithArray:[self.dataListArry filteredArrayUsingPredicate:preicate]];    //刷新表格    [self.skTableView reloadData];}

#pragma mark - UISearchControllerDelegate代理,可以省略,主要是为了验证打印的顺序//测试UISearchController的执行过程- (void)willPresentSearchController:(UISearchController *)searchController{    NSLog(@"willPresentSearchController");}- (void)didPresentSearchController:(UISearchController *)searchController{    NSLog(@"didPresentSearchController");#warning 如果进入预编辑状态,searchBar消失(UISearchController套到TabBarController可能会出现这个情况),请添加下边这句话//    [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