目标-C至Swift:NSDATA，具有NSJSONSERIALISATION

Question

以下是我的代码片段

NSDictionary *json;
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"realstories" ofType:@"json"];
NSData *data = [NSData dataWithContentsOfFile:filePath];
json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

我尝试使用其siwft等效的方式：

 var json = [AnyHashable:Any]()
 let filePath: String? = Bundle.main.path(forResource: "realstories", ofType: "json")
 let data = NSData(contentsOfFile:filePath!)
 json = ((NSKeyedUnarchiver.unarchiveObject(with: data as! Data) as! NSDictionary) as! [AnyHashable:Any])

但是我陷入了错误：

unexpectedly found nil while unwrapping an Optional value

尝试在这里阅读有关它。但是，无法解决错误！

Answer 1

而不是JSONSerialization.jsonObject(with:)您使用的是NSKeyedUnarchiver，也使用本机Data代替NSData。

 var json = [AnyHashable:Any]()
if let filePath = Bundle.main.path(forResource: "realstories", ofType: "json"),
   let data = try? Data(contentsOf: URL(fileURLWithPath: filePath)),
   let dic = (try? JSONSerialization.jsonObject(with: data)) as? [AnyHashable:Any] {
      json = dic
}

Answer 2

if let data =  NSData(contentsOfFile:filePath!)
{
   if  let  json = NSKeyedUnarchiver.unarchiveObject(with: data) as? [AnyHashable:Any]() {
        // do something
    } else {
        print("There is an issue")
    }
  }

Answer 3

// pass your file in fileName   
if let path = Bundle.main().pathForResource(fileNmae, ofType: "json") 
{
        do {
            if let jsonData = NSData(contentsOfFile: path, options: .DataReadingMappedIfSafe, error: nil)
            {
                 if let jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil) as? NSDictionary
                 {
                    print(jsonResult)
                 }
            }
       }
   }

Answer 4

您可以在Swift 3

中以以下方式进行操作

if let fileurl:URL = Bundle.main.url(forResource: "realstories", withExtension: "json") {
    do {
       let data = try Data(contentsOf: fileurl)
       let json = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers)
    }catch {
    }
}