目标-从C到Swift:带有NSJSONSerialisation的NSData

问题描述

下面是我在ObjC中的代码段

Below is my code snippet in ObjC

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

我已经尝试过以这种方式使用它的Siwft:

I've tried using its Siwft equivalent this way:

 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

尝试阅读有关内容此处.但是，无法解决错误！

Tried reading about it Here. But, could not get the error resolved!

推荐答案

您使用的是NSKeyedUnarchiver而不是JSONSerialization.jsonObject(with:)，还请使用本机的Data而不是NSData.

Instead of JSONSerialization.jsonObject(with:) you are using NSKeyedUnarchiver, Also use native Data instead of 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
}

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