How to use the uisearchbar in objective c in iOS 10? - ios

Question

I want to add uisearchbar in table view controller, but I search the uisearchbar tutorial in iOS 9 and try it. I can’t show the uisearchbar on the simulator of my project. It also has not the search function. If I pass the code “self.tableView.contentOffset = CGPointMake(0, CGRectGetHeight(self.searchController.searchBar.frame));”, the Xcode will show the error message. This message is “libc++abi.dylib: terminating with uncaught exception of type NSException”.
Could tell me where is wrong?
Platform: iPhone in iOS 10.3 and iPad in iOS 10.3
Xcode version:8.3.3 (8E3004b)
.h file
#import <UIKit/UIKit.h>
#interface SearchBarTableViewController : UITableViewController <UISearchControllerDelegate, UISearchBarDelegate, UISearchResultsUpdating>
#property (nonatomic, strong) UISearchController *searchController;
#property (weak, nonatomic) IBOutlet UISearchBar *searchBar;
#property(nonatomic,strong) NSMutableArray *RowArray;
#end
.m files
#pragma mark Search bar Part
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
if (!_searchController.searchBar.superview) {
self.tableView.tableHeaderView = self.searchController.searchBar;
}
if (!self.searchController.active && self.searchController.searchBar.text.length == 0) {
self.tableView.contentOffset = CGPointMake(0, CGRectGetHeight(self.searchController.searchBar.frame));
}
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
if (self.searchController.isActive) {
self.searchController.active = NO;
}
}
#pragma mark - Getters / Setters
- (UISearchController *)searchController {
if (!_searchController) {
_searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
_searchController.searchResultsUpdater = self;
_searchController.dimsBackgroundDuringPresentation = NO;
_searchController.searchBar.delegate = self;
[_searchController.searchBar sizeToFit];
}
return _searchController;
}
- (NSArray *)searchResults {
NSString *searchString = self.searchController.searchBar.text;
if (searchString.length > 0) {
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"SELF CONTAINS[c] %#", searchString];
return [self.RowArray filteredArrayUsingPredicate:predicate];
}
else {
return self.RowArray;
}
return #[];
}
#pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (self.searchController.isActive && self.searchController.searchBar.text.length > 0) {
return self.searchResults.count;
}
else {
return self.RowArray.count;
}
return 0;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell;
NSString *cityName = #"";
cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
if (self.searchController.isActive && (![self.searchController.searchBar.text isEqualToString:#""])) {
cityName = [self.searchResults objectAtIndex:indexPath.row];
}
else {
cityName = [self.RowArray objectAtIndex:indexPath.row];
}
cell.textLabel.text = cityName;
return cell;
}
Interface image 1 about outlet setting.
UISearchbar outlet setting.
Search Display Controller outlet setting.

Answer 1

I have found out the answer.
I neglect the updateSearchResultsForSearchController code.
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {
[self.tableView reloadData];
}