Question

请帮忙，我对Swift很新。如果我执行一次，搜索栏中的API调用工作正常。但是，当我清除搜索栏并再试一次时，我收到此错误：

fatal error: unexpectedly found nil while unwrapping an Optional value

在这一行：

mutableURLRequest = NSMutableURLRequest(URL: NSURL(string: URLString.URLString)!)

这是我的代码。请帮忙：

    // Functions for adding search
func createSearchBar() {
    searchBar.placeholder = "Anchor Steam"
    searchBar.delegate = self

    // put into navigation bar
    self.navigationItem.titleView = searchBar
}

func searchBarSearchButtonClicked(searchBar: UISearchBar) {
    searchBar.resignFirstResponder()
    makeAPICall(searchBar.text!)
}

func searchBarTextDidBeginEditing(searchBar: UISearchBar) {
    self.searchBar.showsCancelButton = true
}

func searchBarCancelButtonClicked(searchBar: UISearchBar) {
    searchBar.showsCancelButton = false
    searchBar.text = ""
    searchBar.resignFirstResponder()
    self.searchResultTableView.reloadData()
}
func makeAPICall(beer: String) {
    print("THE SEARCHED BEER IS \(beer)")
     Alamofire.request(.GET, "https://api.untappd.com/v4/search/beer?q=\(beer)&client_id=AAA&client_secret=AAA").responseJSON { response in
            if let json = response.result.value {
                print ("Connection to API successful!")
                if let secondJSON = json["response"] as! NSDictionary? {
                    if let beersJSON = secondJSON["beers"] as! NSDictionary? {
                        if let beerItems = beersJSON["items"] as! [NSDictionary]? {
                            var beersJsonArray: [NSDictionary] = []
                            for beerObject in beerItems {
                                let insideBeerHash = beerObject["beer"]
                                beersJsonArray.append(insideBeerHash as! NSDictionary)
                            }

                            self.beers = Beer.convertBeers((beersJsonArray as? [NSDictionary]!)!)
                            self.searchResultTableView.reloadData()

                        }
                    }
                }
        }

    }
}

Answer 1

选项：

1）确保 URLString.URLString 已定义

2）如果尝试使用：let url：

let mutableURLRequest = NSMutableURLRequest（string：URLString.URLString）！

3）或者也许：

let mutableURLRequest = NSURL（string：URLString.URLString）！

Alamofire抛出致命错误：在解开Optional值时意外地发现nil

1 个答案: