ios - How to parse a api for swift 3? -


have been researching on parsing quite bit. plethora of information avilable json nothing seems explain how in sensible way extract information swift 3.

this got far 

func getbookdetails() {       let scripturl = "https://www.googleapis.com/books/v1/volumes?q=isbn:9781451648546" .      let myurl = url(string:scripturl)     let request = nsmutableurlrequest(url: myurl!)     request.httpmethod = "get"      let task = urlsession.shared.datatask(with: myurl! ) { (data, response, error) in         if error != nil{         print("this error",error!)             return         } else{             if let mydata = data{         do{             let myjson = try (jsonserialization.jsonobject(with: mydata, options: jsonserialization.readingoptions.mutablecontainers)) anyobject             //   print("this  json",myjson) ---> prints out json                if let dictonary = myjson["items"] anyobject? {             print("the dictonary",dictonary) // ----> output                 if let dictonaryaa = dictonary["accessinfo"] anyobject? {                     print("the accessinfo",dictonaryaa)                 }              }           } catch{             print("this in catch")                 }             }      //data         }     }     task.resume()  }  }      output :         dictonary (     {     accessinfo =         {         accessviewstatus = sample;         country = us;       =============    relevant data in https://www.googleapis.com/books/v1/volumes?   q=isbn:9781451648546"     ==========================         title = "steve jobs";     }; } )

just need parse through json data name, author , title of book reference isbn. know there should better way things understandable new language

first of all, json types value types in swift 3 unspecified type any, not anyobject.

second of all, there 2 collection types in json type set, dictionary ([string:any]) , array ([any], in cases [[string:any]]). it's never any nor anyobject.

third of all, given json not contain key name.

for convenience let's use type alias json dictionary:

typealias jsondictionary = [string:any]

the root object dictionary, in dictionary there array of dictionaries key items. , pass no options, .mutablecontainers nonsense in swift.

guard let myjson = try jsonserialization.jsonobject(with: mydata) as? jsondictionary,        let items = myjson["items"] as? [jsondictionary] else { return }

iterate through array , extract values title , authors array way. both values in dictionary key volumeinfo.

for item in items {      if let volumeinfo = item["volumeinfo"] as? jsondictionary {          let title = volumeinfo["title"] as? string          let authors = volumeinfo["authors"] as? [string]          print(title ?? "no title", authors ?? "no authors")

the isbn information in array key industryidentifiers 

         if let industryidentifiers = volumeinfo["industryidentifiers"]  as? [jsondictionary] {              identifier in industryidentifiers {                 let type = identifier["type"] as! string                 let isbn = identifier["identifier"] as! string                 print(type, isbn)              }          }      } }

Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more