在我的tableViewController中，我需要将搜索功能作为功能之一，并且它符合这些委托，其中一个是UISearchController委托的子类。
class MyTableViewController: UITableViewController, UISearchResultsUpdating, UISearchBarDelegate, CustomSearchControllerDelegate {
var customSearchController: CustomSearchController!
func addCustomSearchBar() {
customSearchController = CustomSearchController(...)
/* detail setting and add the customSearchBar */
customSearchController.customDelegate = self
customSearchController.searchResultsUpdater = self
/* implement customDelegate method */
func updateSearchResultsForSearchController(searchController: UISearchController) {
guard let searchString = customSearchController.customSearchBar.text else {
return
}
newArray = dataArray.filter({ (text) -> Bool in
let text:NSString = text
return (text.rangeOfString(searchString!, options: NSStringCompareOptions.CaseInsensitiveSearch).location) != NSNotFound
})
tableView.reloadData()
/*-----------won't work-------------*/
}
}
我的UISearchController的子类如下，
class CustomSearchController: UISearchController, UISearchBarDelegate{
var customSearchBar: CustomSearchBar! //subclass of UISearchBar
var customDelegate: CustomSearchControllerDelegate!
...
init(...) {
self.mySearchBar(...)
}
func mySearchBar(...) {
customSearchBar = CustomSearchBar(...)
/* detail setting */
customSearchBar.delegate = self
}
func searchBarTextDidBeginEditing(searchBar: UISearchBar) {
customDelegate.didStartSearching()
}
func searchBarSearchButtonClicked(searchBar: UISearchBar) {
customSearchBar.resignFirstResponder()
customDelegate.didTapOnSearchButton()
}
func searchBarCancelButtonClicked(searchBar: UISearchBar) {
customSearchBar.resignFirstResponder()
customDelegate.didTapOnCancelButton()
}
如您所见，此子类有自己的委托来处理UISearchBarDelegate。
问题是，为什么UISearchResultsUpdating委托方法不起作用？，我认为UISearchResultsUpdating委托也可以。
我知道我可以在我的UISearchController func searchBar(searchBar: UISearchBar, textDidChange: searchText: String)子类中实现UISearchBarDelegate方法，作为在搜索栏中输入文本时搜索的替代方法。
但我真的很想知道为什么它不会在这里工作，谢谢你帮助我。
如果有任何歧义，请在下面评论，再次感谢！