iOS MKLocalSearch导致崩溃

Question

我使用UISearchBar和UITableView执行MKLocalSearch。

第一次搜索总是很有效，但如果你尝试另一次，应用程序会崩溃，我会得到一个"；索引超出范围误差"；。如果你需要更多信息，请告诉我，谢谢。

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
self.searchResults = [] //this might be causing the crash
print("searchText (searchText)")
let searchRequest = MKLocalSearch.Request()
searchRequest.naturalLanguageQuery = searchText

let search = MKLocalSearch(request: searchRequest)
search.start { response, error in
guard let response = response else {
print("Error: (error?.localizedDescription ?? "Unknown error").")
return
}
for item in response.mapItems {
self.searchResults.append(item.placemark)
self.tableView.reloadData()
}
}
}
}
//MARK: TableView
extension LocationSearchViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return searchResults.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ResultCell", for: indexPath)
let listItem = searchResults[indexPath.row]
cell.textLabel?.text = listItem.name
cell.detailTextLabel?.text = listItem.administrativeArea ?? ""
return cell
}

}
extension LocationSearchViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("selected a row")
let local = searchResults[indexPath.row]

// pass local back
if let delegate = delegate{
delegate.doSomethingWith(data: local)
}


dismiss(animated: true, completion: nil)
}
}

第三次或第四次尝试搜索后，表中的结果保持不变，不再记录更多结果。我得到错误：

错误：操作无法完成。(MKErrorDomain错误3.(

Answer 1

您的问题是过早更改了searchResults。尝试：

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
print("searchText (searchText)")
let searchRequest = MKLocalSearch.Request()
searchRequest.naturalLanguageQuery = searchText

let search = MKLocalSearch(request: searchRequest)
search.start { response, error in
guard let response = response else {
print("Error: (error?.localizedDescription ?? "Unknown error").")
return
}
var newArray: [YourStruct] = []
for item in response.mapItems {
newArray.append(item.placemark)

}
self.searchResults = newArray
self.tableView.reloadData()
}
}