Solution to the error report of local json files in iOS Swift

Preface

I'm bored recently and I've read a local json, but I didn't expect to use Swift to test the data and found that I kept loading the local json file:

Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

It turns out that there is a comment in front of the local json file/* chrome-extension://pkgccpejnmalmdinmhkkfafefagiiiad/template/fehelper_jsonformat.html */ Then I can't read the "`` pit, remove the comments and read them normally

let path = (forResource: "countryData", ofType: "json")
let url = URL(fileURLWithPath: path!)
// Methods with throws need to throw exceptions do {
    /*
      * The difference between try and try!
      * An exception occurs and will jump to the catch code
      * try! The program will crash directly if an exception occurs
      */
   let data = try Data(contentsOf: url)
   let jsonData:Any = try (with: data, options: )
   let jsonArr = jsonData as! NSArray
   
   for dict in jsonArr {
    print(dict)
   }
  } catch let error as Error! {
   print("There was an error reading local data!",error)
  }

Extended reading--Apple official website Error Handling

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