我有一个现有的应用程序,用Objective-C写成,具有表格视图.
我现在试图回到这个应用程序,并在表中添加一个搜索栏.
问题是,现在有了新的UISearchController协议,在线上似乎没有什么信息在如何在Objective-C中实现这一点 – 所有的教程和示例,我可以找到所有的Swift.
我已经将代理添加到.h文件中：
UISearchBarDelegate,UISearchResultsUpdating
我在viewDidLoad中有以下代码,它可以工作并添加一个搜索栏：
// Search controller searchController = [[UISearchController alloc] initWithSearchResultsController:nil]; searchController.searchResultsUpdater = self; searchController.dimsBackgroundDuringPresentation = NO; searchController.searchBar.delegate = self; // Add the search bar self.tableView.tableHeaderView = searchController.searchBar; self.definesPresentationContext = YES; [searchController.searchBar sizetoFit];
这就是我所拥有的！
我会感激任何指针,示例代码或教程如何在现有的目标c应用程序表视图中实现新的UISearchController.
解决方法
初始化按照上述步骤进行.
1)协议声明在< UISearchBarDelegate,UISearchControllerDelegate,UISearchResultsUpdating>在.h接口类中
2)声明以下属性
//Fetch result controller @property (nonatomic,strong) UISearchController *searchController; //for the results to be shown with two table delegates @property (nonatomic,strong) CLCustomerResultrowsItemsCellController *searchResultsController; //this custom controller is only suppose to have number of rows and cell for row function of table datasource
3)国家恢复
@property BOOL searchControllerWasActive; @property BOOL searchControllerSearchFieldWasFirstResponder;
4)在ViewDidload中的此步骤中初始化代码
_searchResultsController = [[CLChatContactsSearchResultController alloc] init]; _searchController = [[UISearchController alloc] initWithSearchResultsController:_searchResultsController]; self.searchController.searchResultsUpdater = self; self.searchController.searchBar.placeholder = nil; [self.searchController.searchBar sizetoFit]; self.contactsTableView.tableHeaderView = self.searchController.searchBar; // we want to be the delegate for our filtered table so didSelectRowAtIndexPath is called for both tables self.searchResultsController.tableView.delegate = self; self.searchController.delegate = self; self.searchController.dimsBackgroundDuringPresentation = YES; // default is YES self.searchController.searchBar.delegate = self; // so we can monitor text changes + others // Search is Now just presenting a view controller. As such,normal view controller // presentation semantics apply. Namely that presentation will walk up the view controller // hierarchy until it finds the root view controller or one that defines a presentation context. // self.definesPresentationContext = YES; // kNow where you want UISearchController to be displayed
5)使用按钮即使启动控制器,也可以通过这些功能以备将来使用,如果有任何评论
#pragma mark - UISearchBarDelegate
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
[searchBar resignFirstResponder];
}
#pragma mark - UISearchControllerDelegate
// Called after the search controller's search bar has agreed to begin editing or when
// 'active' is set to YES.
// If you choose not to present the controller yourself or do not implement this method,// a default presentation is performed on your behalf.
//
// Implement this method if the default presentation is not adequate for your purposes.
//
- (void)presentSearchController:(UISearchController *)searchController {
}
- (void)willPresentSearchController:(UISearchController *)searchController {
// do something before the search controller is presented
}
- (void)didPresentSearchController:(UISearchController *)searchController {
// do something after the search controller is presented
}
- (void)willdismissSearchController:(UISearchController *)searchController {
// do something before the search controller is dismissed
}
- (void)diddismissSearchController:(UISearchController *)searchController {
// do something after the search controller is dismissed
}
6)在搜索文本时,你会得到这个回调
#pragma mark - UISearchResultsUpdating
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {
// update the filtered array based on the search text
Nsstring *searchText = searchController.searchBar.text;
id <NSFetchedResultsSectionInfo> sectionInfo = [_fetchedResultsController.sections objectAtIndex:0];
if (searchText == nil) {
// If empty the search results are the same as the original data
self.searchResults = [sectionInfo.objects mutablecopy];
} else {
NSMutableArray *searchResults = [[NSMutableArray alloc] init];
NSArray *allObjects = sectionInfo.objects;
for (PhoneNumber *phoneMO in allObjects) {
if ([phoneMO.number containsstring:searchText] || [[phoneMO.closrr_id filteredId] containsstring:searchText] || [[phoneMO.contact.fullname lowercaseString] containsstring:[searchText lowercaseString]]) {
[searchResults addobject:phoneMO];
}
}
self.searchResults = searchResults;
}
// hand over the filtered results to our search results table
CLCustomerResultrowsItemsCellController *tableController = (CLCustomerResultrowsItemsCellController *)self.searchController.searchResultsController;
tableController.filteredContacts = self.searchResults;
[tableController.tableView reloadData];
}
7)您必须在Custom类中声明filteringContacts属性,该属性将填充搜索到的项目.
8)这样做,在选择行中比较表视图,如果它的主控制器或自定义控制器类表视图,并对所选项进行操作.
希望这是有帮助的.