点击按钮后显示 UISearchController

Question

我正在寻找一种方法，如何在点击按钮后显示带有搜索栏的搜索视图。我是否想创建一个带有搜索栏的新 UIView，然后在点击按钮后转到该 UIView？或者有更好的选择吗？

您可以将其想象为在 Youtube 应用程序中搜索，但您会在键入时看到搜索结果。

编辑： 所以现在我设法在点击按钮后显示搜索栏，但它没有正确显示。问题是当搜索栏向下移动时，它被从下切下来：

我的代码：

implementation ViewController {
  NSInteger listNo;
  DataClass *dataClass;
  UITableViewController *searchResultsController;
}


- (void)viewDidLoad {
  [super viewDidLoad];
  dataClass = [DataClass getInstance];
  self.navigationController.navigationBarHidden = YES;


  // Prepare Search Controller and Result Controller
  searchResultsController = [[UITableViewController alloc] initWithStyle:UITableViewStylePlain];
  searchResultsController.tableView.dataSource = self;
  searchResultsController.tableView.delegate = self;

  self.searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController];
  self.searchController.searchResultsUpdater = self;
  self.searchController.delegate = self;
  self.searchController.searchBar.delegate = self;
  self.searchController.searchBar.frame =   CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y + 5,  self.searchController.searchBar.frame.size.width, 44.0);
  [self.searchController.searchBar sizeToFit];

}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
  return 5;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section      {
  return 3;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  static NSString *identifier = @"cell";
  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if (!cell) {
      cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault  reuseIdentifier:identifier];
  }
  cell.textLabel.text = @"Ahoj";

  return cell;
}


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

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

}

// Load data to next view
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:@"showTable"]) {
    AdditivesTableViewController *atvc = (AdditivesTableViewController    *)segue.destinationViewController;

    switch (listNo) {
        case 0:
            atvc.additivesList = [[NSMutableArray alloc] initWithArray:(NSArray     *)dataClass.nonDangerousAdditives];
            break;
        case 1:
            atvc.additivesList = [[NSMutableArray alloc] initWithArray:(NSArray *)dataClass.mediumDangerousAdditives];
            break;
        case 2:
            atvc.additivesList = [[NSMutableArray alloc] initWithArray:(NSArray *)dataClass.dangerousAdditives];
            break;
        case 3:
            atvc.additivesList = [[NSMutableArray alloc] initWithArray:(NSArray *)dataClass.highDangerousAdditives];
            break;

        default:
            atvc.additivesList = [[NSMutableArray alloc] initWithArray:(NSArray *)dataClass.allAdditives];
            break;
    }
  }
}



#pragma mark - IBActions

- (IBAction)nonDangList:(id)sender {
  listNo = 0;
  [self performSegueWithIdentifier:@"showTable" sender:self];
}

- (IBAction)medDangList:(id)sender {
  listNo = 1;
  [self performSegueWithIdentifier:@"showTable" sender:self];
}

- (IBAction)dangList:(id)sender {
  listNo = 2;
  [self performSegueWithIdentifier:@"showTable" sender:self];
}

- (IBAction)highDangList:(id)sender {
  listNo = 3;
  [self performSegueWithIdentifier:@"showTable" sender:self];
}

- (IBAction)searchAdditive:(id)sender {
  [self.view addSubview:self.searchController.searchBar];
  [self.searchController setActive:YES];
  [self.searchController.searchBar becomeFirstResponder];
}

@end