在用Swift測試數(shù)據(jù)發(fā)現(xiàn)加載本地json文件一直報以下錯誤:

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.}

原來是本地json文件前面有一段注釋/* chrome-extension://pkgccpejnmalmdinmhkkfafefagiiiad/template/fehelper_jsonformat.html */ 然后就讀取不到了```坑啊,去掉注釋就可以正常讀取了

let path = Bundle.main.path(forResource: "countryData", ofType: "json")
let url = URL(fileURLWithPath: path!)
// 帶throws的方法需要拋異常
    do {
              /*
                 * try 和 try! 的區(qū)別
                 * try 發(fā)生異常會跳到catch代碼中
                 * try! 發(fā)生異常程序會直接crash
                 */
            let data = try Data(contentsOf: url)
            let jsonData:Any = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers)
            let jsonArr = jsonData as! NSArray
            
            for dict in jsonArr {
                print(dict)
            }
        } catch let error as Error! {
            print("讀取本地數(shù)據(jù)出現(xiàn)錯誤!",error)
        }

擴展閱讀--蘋果官網(wǎng) Error Handling