Question

运行此代码时出现“致命错误：在解包可选值时意外发现nil”的错误：

func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
// Request Google maps API, all returned places should be assigned to the array that works as the table view data source

let placesClient = GMSPlacesClient()
placesClient.autocompleteQuery(searchText, bounds: nil, filter: nil) { (results, error:NSError?) -> Void in
    self.resultsArray.removeAll()
    if results == nil {
        return
    }
    for result in results!{
        if let result = result as? GMSAutocompletePrediction{
            self.resultsArray.append(result.attributedFullText.string)
        }
    }
    self.searchResultController.reloadDataWithArray(self.resultsArray)
}}

有谁知道为什么？

Answer 1

所以我自己实现了它，它就像一个魅力：

/// Search for the cities after every change in SearchBar - uses google maps SDK and autocomplete.
///
/// - parameter searchBar: current SearchBar
/// - parameter searchText: entered text we want to use for search
func searchBar(searchBar: UISearchBar, textDidChange searchText: String){

        let placesClient = GMSPlacesClient()
        placesClient.autocompleteQuery(searchText, bounds: nil, filter: nil) { (results, error:NSError?) -> Void in
            self.cities.removeAll()

            if let theResults = results {
                for result in theResults {
                    if let result = result as? GMSAutocompletePrediction{
                        self.cities.append(result.attributedFullText.string)
                    }
                }
                dispatch_async(dispatch_get_main_queue(), {
                    self.tableView.hidden = false
                    self.tableView.reloadData()
                })
            } else {
                // It is necessary to reload data everytime. given scenario: clear whole text and theResults is nil but there preserve data in table which can lead to exception
                dispatch_async(dispatch_get_main_queue(), {
                    self.tableView.hidden = false
                    self.tableView.reloadData()
                })
            }
        }
}

恐怕我现在无法提供更多帮助：/

致命错误：在展开Optional值时意外发现nil

1 个答案: