在swift中獲取[String：AnyObject]的更深嵌套值3

Question

我通過通過Firebase Facebook身份驗證登錄用戶來獲取用戶的Facebook個人資料詳細信息。

嵌套數組是這樣的：

["picture": { 
    data = { 
     "is_silhouette" = 0; 
     url = "someUrl"; 
    }; 
}, "name": James, "last_name": Bond, "email": james_bond007@hotmail.com, "id": 10210066243726102, "first_name": James, "gender": male] 

林掙扎着爬圖片URL的值。

我想是這樣的，但它不工作：

var fbPhotoUrl: URL? 
self.fbPhotoUrl = self.FBUserDict["picture"]!["data"]!["url"] as? URL 

Answer 1

嘗試是這樣的：

if let picture = FBUserDict["picture"] as? [String: Any], let data = picture["data"] as? [String: Any], let urlString = data["url"] as? String, let url = URL(string: urlString) { 

    self.fbPhotoUrl = url 
}