Question

自从更新到swift 3后，我似乎已经发现了一些错误

        // Issue #1
        let correctedAddress:String! = self.searchResults![(indexPath as NSIndexPath).row].addingPercentEncoding(withAllowedCharacters: CharacterSet.symbols)
        print(correctedAddress)
        let url = URL(string: "https://maps.googleapis.com/maps/api/geocode/json?address=\(correctedAddress)&sensor=false")

        let task = URLSession.shared.dataTask(with: url!) {
            data, response, error in

            do {
                if data != nil{
                    let dic = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableLeaves) as! NSDictionary

                    // Issue #2
                    let results = dic["results"] as! [String: Any]
                    let geometry = results["geometry"] as! [String: Any]
                    let location = geometry["location"] as! [String: Any]

                    let lat = location["lat"] as! Double
                    let lon = location["lng"] as! Double

                    self.delegate.locateWithLongitude(lon, andLatitude: lat)
                }
            }
            catch {
                print("Error")
            }
        }
        task.resume()

问题＃1：例如，correctedAddress返回值"%51%75%C3%A9%62%65%63%2C%20%43%61%6E%61%64%61"。然而，由于某种原因，url常量返回nil并导致崩溃。

我不明白为什么它会返回nil。我可以使用值correctedAddress替换网址中的%51%75%C3%A9%62%65%63%2C%20%43%61%6E%61%64%61，以便完整的网址

let url = NSURL(string: "https://maps.googleapis.com/maps/api/geocode/json?address=%51%75%C3%A9%62%65%63%2C%20%43%61%6E%61%64%61&sensor=false")，它运作正常。

问题＃2：它只是在let results崩溃，我得到了Could not cast value of type '__NSArrayI' (0x108bb0c08) to 'NSDictionary' (0x108bb1108).

的错误

Answer 1

为问题＃2

尝试以下代码

let results = dic["results"] as! NSArray
for result in results {
    let strObj = result as! NSDictionary
    let geometry = strObj["geometry"] as! NSDictionary
    let location = geometry["location"] as! NSDictionary
    let lat = location["lat"] as! NSNumber
    let lon = location["lng"] as! NSNumber
}

对于问题＃1，请尝试以下代码

let valueAtIndex = self.searchResults![(indexPath as NSIndexPath).row].addingPercentEncoding(withAllowedCharacters: CharacterSet.symbols)
guard let correctedAddress = valueAtIndex else { return }
let adrString:String = "https://maps.googleapis.com/maps/api/geocode/json?address=\(correctedAddress)&sensor=false"
let url:URL = URL(string: adrString)!

GooglePlaces API Swift 3问题

1 个答案: