Swift Higher Order Functions, Codable, Model Creation, Nested JSON
Parsing Imgur json.
How would you assign 'title' from ImageData to Image's title ? Is there a way using higher order functions?
struct ImgurResponse: Codable {
let data: [ImageData]
}
struct ImageData: Codable {
let title: String
let images: [Image]
}
struct Image: Codable {
let title, descripton, nsfw: String
let link: String
}
User @Dhawal suggested adding following init to Image:
init(title: String, desc: String, nsfw: String, link: String) {
self.title = title
self.description = desc
self.nsfw = nsfw
self.link = link
so that we can:
let response = try JSONDecoder().decode(ImgurResponse.self, from: data)
let images = response.data.compactMap{Image(title: $0.title, desc: $0.images.first!.description, nsfw: $0.images.first!.nsfw, link: $0.images.first!.link)}
Anything more swifty then that?
See also questions close to this topic
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JSONDecodeError when using for loop in python
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Here's my code :
import requests import json import grequests ls = [] for i in null_data['name']: url = 'https://pokeapi.co/api/v2/pokemon/' + i.lower() ls.append(url) rs = (grequests.get(u) for u in ls) s = grequests.map(rs) #This line works print(s[0].json()['weight']/10) for x in s: #This one fails js = x.json() peso = js['weight']/10 null_data.loc[null_data['name'] == i.capitalize(), 'weight_kg'] = peso<ipython-input-21-9f404bc56f66> in <module> 13 14 for x in s: ---> 15 js = x.json() 16 peso = js['weight']/10 17 null_data.loc[null_data['name'] == i.capitalize(), 'weight_kg'] = peso JSONDecodeError: Expecting value: line 1 column 1 (char 0) -
How i can read the nested properties and pushing to the array using javascript?
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{ name:"test", type:"array" [name]: { name: "test1", type: "..." } }JSON object to read:
{ "properties": { "value": { "type": "array", "items": { "required": [ "@odata.etag", "id", "createdDateTime", "lastModifiedDateTime", "changeKey", "originalStartTimeZone", "originalEndTimeZone", "iCalUId", "reminderMinutesBeforeStart", "isReminderOn", "hasAttachments", "subject", "bodyPreview", "importance", "sensitivity", "isAllDay", "isCancelled", "isOrganizer", "responseRequested", "showAs", "type", "webLink", "isOnlineMeeting", "onlineMeetingProvider", "allowNewTimeProposals", "isDraft", "hideAttendees" ], "properties": { "id": { "type": "string", "minLength": 1 }, "end": { "type": "object", "required": [ "dateTime", "timeZone" ], "properties": { "dateTime": { "type": "string", "minLength": 1 }, "timeZone": { "type": "string", "minLength": 1 } } }, "body": { "type": "object", "required": [ "contentType", "content" ], "properties": { "content": { "type": "string", "minLength": 1 }, "contentType": { "type": "string", "minLength": 1 } } }, "type": { "type": "string", "minLength": 1 }, "start": { "type": "object", "required": [ "dateTime", "timeZone" ], "properties": { "dateTime": { "type": "string", "minLength": 1 }, "timeZone": { "type": "string", "minLength": 1 } } }, "showAs": { "type": "string", "minLength": 1 }, "iCalUId": { "type": "string", "minLength": 1 }, "isDraft": { "type": "boolean" }, "subject": { "type": "string", "minLength": 1 }, "webLink": { "type": "string", "minLength": 1 }, "isAllDay": { "type": "boolean" }, "location": { "type": "object", "required": [ "displayName", "locationType", "uniqueIdType", "address", "coordinates" ], "properties": { "address": { "type": "object", "required": [], "properties": {} }, "coordinates": { "type": "object", "required": [], "properties": {} }, "displayName": { "type": "string" }, "locationType": { "type": "string", "minLength": 1 }, "uniqueIdType": { "type": "string", "minLength": 1 } } }, "attendees": { "type": "array", "items": { "required": [ "type" ], "properties": { "type": { "type": "string", "minLength": 1 }, "status": { "type": "object", "required": [ "response", "time" ], "properties": { "time": { "type": "string", "minLength": 1 }, "response": { "type": "string", "minLength": 1 } } }, "emailAddress": { "type": "object", "required": [ "name", "address" ], "properties": { "name": { "type": "string", "minLength": 1 }, "address": { "type": "string", "minLength": 1 } } } } }, "minItems": 1, "uniqueItems": true }, "changeKey": { "type": "string", "minLength": 1 }, "locations": { "type": "array", "items": { "required": [], "properties": {} } }, "organizer": { "type": "object", "required": [ "emailAddress" ], "properties": { "emailAddress": { "type": "object", "required": [ "name", "address" ], "properties": { "name": { "type": "string", "minLength": 1 }, "address": { "type": "string", "minLength": 1 } } } } }, "categories": { "type": "array", "items": { "required": [], "properties": {} } }, "importance": { "type": "string", "minLength": 1 }, "recurrence": {}, "@odata.etag": { "type": "string", "minLength": 1 }, "bodyPreview": { "type": "string", "minLength": 1 }, "isCancelled": { "type": "boolean" }, "isOrganizer": { "type": "boolean" }, "sensitivity": { "type": "string", "minLength": 1 }, "isReminderOn": { "type": "boolean" }, "hideAttendees": { "type": "boolean" }, "onlineMeeting": {}, "transactionId": {}, "hasAttachments": { "type": "boolean" }, "responseStatus": { "type": "object", "required": [ "response", "time" ], "properties": { "time": { "type": "string", "minLength": 1 }, "response": { "type": "string", "minLength": 1 } } }, "seriesMasterId": {}, "createdDateTime": { "type": "string", "minLength": 1 }, "isOnlineMeeting": { "type": "boolean" }, "onlineMeetingUrl": {}, "responseRequested": { "type": "boolean" }, "originalEndTimeZone": { "type": "string", "minLength": 1 }, "lastModifiedDateTime": { "type": "string", "minLength": 1 }, "allowNewTimeProposals": { "type": "boolean" }, "onlineMeetingProvider": { "type": "string", "minLength": 1 }, "originalStartTimeZone": { "type": "string", "minLength": 1 }, "reminderMinutesBeforeStart": { "type": "number" } } }, "minItems": 1, "uniqueItems": true }, "@odata.context": { "type": "string", "minLength": 1 }, "@odata.nextLink": { "type": "string", "minLength": 1 } } } -
Using Jackson to deserialize with Lombok builder
The Question
Lombok's
@builderannotation creates a builder-class for a class. To support deserialization of json items (using Jackson's ObjectMapper), I've added the following annotations:@Builder @JsonDeserialize(builder = Item.ItemBuilder.class) @JsonPOJOBuilder(withPrefix="") public class Item { @Getter String partitionvalue; }This is based on the
@Jacksonizeddocumentation. On the usage of the deserializer, upon a json file which is stored in AWS S3 bucket and its content is simply:{"partitionvalue": "test"}, my code is:AmazonS3 s3Client = AmazonS3ClientBuilder.standard() .withCredentials(new DefaultAWSCredentialsProviderChain()) .withRegion(region) .build(); S3Object s3Object = s3Client.getObject(new GetObjectRequest(bucket, key)); Item item = objectMapper.readValue(s3Object.getObjectContent(), Item.class);However when running on a json file that Jackson fails with the message:
Unrecognized field "partitionvalue" (class com.example.Test$TestBuilder), not marked as ignorable (0 known properties: ]) at [Source: com.amazonaws.services.s3.model.S3ObjectInputStream@2ca47471; line: 1, column: 21] (through reference chain: com.example.TestBuilder["partitionvalue"])Extra Details
Using @
Jacksonizedannotation directly didn't work as well, and since it is lombok-experimental I used the annotations I needed to use with builder directly.I verified that Lombok will do what I expect of a builder class by using "delombok" option in the Lombok IntelliJ plugin:
public class Item { String partitionvalue; Item(String partitionvalue) { this.partitionvalue = partitionvalue; } public static ItemBuilder builder() { return new ItemBuilder(); } public String getPartitionvalue() { return this.partitionvalue; } public static class ItemBuilder { private String partitionvalue; ItemBuilder() { } public Item.ItemBuilder partitionvalue(String partitionvalue) { this.partitionvalue = partitionvalue; return this; } public Item build() { return new Item(partitionvalue); } public String toString() { return "Item.ItemBuilder(partitionvalue=" + this.partitionvalue + ")"; } } }- Without the
@Builderannotation (and with adding@NoArgsConstructor+@AllArgsConstructor+@Setter) it worked fine, so the problem isn't with the file from the S3 bucket or the way it is parsed.
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My cell view hierarchy is the following.
And the code to show the native ad in
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Swift - Problem with scrollview (Need to print when dragging down)
I am testing the swiping controller/gesture from Jake Spracher with his SnapchatSwipeView (https://github.com/jakespracher/Snapchat-Swipe-View )
I have setup a topVC,leftVC,rightVC and middleVC(the main VC).
I manage to capture when the user swipe from the center to the rightVC or to the left VC, with this :
func scrollViewDidScroll(_ scrollView: UIScrollView) { if delegate != nil && !delegate!.outerScrollViewShouldScroll() && !directionLockDisabled { let newOffset = CGPoint(x: self.initialContentOffset.x, y: self.initialContentOffset.y) self.scrollView!.setContentOffset(newOffset, animated: false) } if (scrollView.contentOffset) == CGPoint(x: 750.0, y: 0.0) { print ("TEST OK LEFT!") NotificationCenter.default.post(name: NSNotification.Name(rawValue: "loadRinkbox"), object: nil) } if (scrollView.contentOffset) == CGPoint(x: 0.0, y: 0.0) { print ("TEST OK LEFT!") } if (scrollView.contentOffset) == CGPoint(x: -750.0, y: 0.0) { print ("TEST OK RIGHT") } if (scrollView.contentOffset) == CGPoint(x: 375, y: 0.0) { print ("TEST OK!") } }But I cannot manage to capture when the user swipe from the centerVC to the topVC, and from topVC to centerVC. I have tried a lot of things but I didn't manage to do it.
My code is for swift 4.
For clarity, I put here the two full swift files. Many, million thanks for those that can help me !
ContainerViewController.swift
// // ContainerViewController.swift // SnapchatSwipeView // // Created by Jake Spracher on 8/9/15. // Copyright (c) 2015 Jake Spracher. All rights reserved. // import UIKit import AVFoundation protocol SnapContainerViewControllerDelegate { // print "Snapcontainerview" func outerScrollViewShouldScroll() -> Bool } class SnapContainerViewController: UIViewController, UIScrollViewDelegate { var captureSession : AVCaptureSession! private var current: UIViewController // print "2" var deeplink: DeeplinkType? { didSet { handleDeeplink() } } init() { current = SplashViewController() super.init(nibName: nil, bundle: nil) } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } var topVc: UIViewController? var leftVc: UIViewController! var middleVc: UIViewController! var rightVc: UIViewController! var bottomVc: UIViewController? var directionLockDisabled: Bool! var horizontalViews = [UIViewController]() var veritcalViews = [UIViewController]() var initialContentOffset = CGPoint() // scrollView initial offset var middleVertScrollVc: VerticalScrollViewController! var scrollView: UIScrollView! var delegate: SnapContainerViewControllerDelegate? class func containerViewWith(_ leftVC: UIViewController, middleVC: UIViewController, rightVC: UIViewController, topVC: UIViewController?=nil, bottomVC: UIViewController?=nil, directionLockDisabled: Bool?=false) -> SnapContainerViewController { let container = SnapContainerViewController() container.directionLockDisabled = directionLockDisabled container.topVc = topVC container.leftVc = leftVC container.middleVc = middleVC container.rightVc = rightVC container.bottomVc = bottomVC return container } var scrollOffSetClosure: ((_ offset: CGFloat) -> Void)? // code truncated for brevity func scrollViewDidScroll2(_ scrollView: UIScrollView) { scrollOffSetClosure!(scrollView.contentOffset.x) print("test here") } func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) { print("end scroll") } override func viewDidLoad() { super.viewDidLoad() addChildViewController(current) current.view.frame = view.bounds view.addSubview(current.view) current.didMove(toParentViewController: self) } func setupVerticalScrollView() { middleVertScrollVc = VerticalScrollViewController.verticalScrollVcWith(middleVc: middleVc as! Camera, topVc: topVc, bottomVc: bottomVc) delegate = middleVertScrollVc } func setupHorizontalScrollView() { scrollView = UIScrollView() scrollView.isPagingEnabled = true scrollView.showsHorizontalScrollIndicator = false scrollView.bounces = false print ("6") let view = ( x: self.view.bounds.origin.x, y: self.view.bounds.origin.y, width: self.view.bounds.width, height: self.view.bounds.height ) scrollView.frame = CGRect(x: view.x, y: view.y, width: view.width, height: view.height ) self.view.addSubview(scrollView) let scrollWidth = 3 * view.width let scrollHeight = view.height scrollView.contentSize = CGSize(width: scrollWidth, height: scrollHeight) leftVc.view.frame = CGRect(x: 0, y: 0, width: view.width, height: view.height ) middleVertScrollVc.view.frame = CGRect(x: view.width, y: 0, width: view.width, height: view.height ) rightVc.view.frame = CGRect(x: 2 * view.width, y: 0, width: view.width, height: view.height ) addChildViewController(leftVc) addChildViewController(middleVertScrollVc) addChildViewController(rightVc) scrollView.addSubview(leftVc.view) scrollView.addSubview(middleVertScrollVc.view) scrollView.addSubview(rightVc.view) leftVc.didMove(toParentViewController: self) middleVertScrollVc.didMove(toParentViewController: self) rightVc.didMove(toParentViewController: self) scrollView.contentOffset.x = middleVertScrollVc.view.frame.origin.x scrollView.delegate = self } func scrollViewWillBeginDragging(_ scrollView: UIScrollView) { // print ("Scrollviewvillbegindragging scrollView.contentOffset \(scrollView.contentOffset)") self.initialContentOffset = scrollView.contentOffset } func scrollViewDidScroll(_ scrollView: UIScrollView) { if delegate != nil && !delegate!.outerScrollViewShouldScroll() && !directionLockDisabled { let newOffset = CGPoint(x: self.initialContentOffset.x, y: self.initialContentOffset.y) // print(newOffset.x) //print(newOffset.y) // Setting the new offset to the scrollView makes it behave like a proper // directional lock, that allows you to scroll in only one direction at any given time self.scrollView!.setContentOffset(newOffset, animated: false) // print ("newOffset \(newOffset)") // tell child views they have appeared / disappeared } if (scrollView.contentOffset) == CGPoint(x: 0.0, y: 667.0) {print ("aaa!")} if (scrollView.contentOffset) == CGPoint(x: 0.0, y: -667.0) {print ("bbb!")} if (scrollView.contentOffset) == CGPoint(x: 0.0, y: 375) {print ("aaccca!")} if (scrollView.contentOffset) == CGPoint(x: 0.0, y: -375) {print ("ddddd!")} if (scrollView.contentOffset) == CGPoint(x: 0.0, y: 0.0) {print ("eeeeeee!")} // if (scrollView.contentOffset) == CGPoint(x: 0.0, y: 667.0) {print ("ffffff!")} // if (scrollView.contentOffset) == CGPoint(x: 0.0, y: 667.0) {print ("aggggggggaa!")} // print ("scrollViewDidScroll scrollView.contentOffset \(scrollView.contentOffset)") // scrollView.contentOffset if (scrollView.contentOffset) == CGPoint(x: 750.0, y: 0.0) { print ("TEST OK LEFT!") NotificationCenter.default.post(name: NSNotification.Name(rawValue: "loadRinkbox"), object: nil) } if (scrollView.contentOffset) == CGPoint(x: 0.0, y: 0.0) { print ("TEST OK RIGHT!") } if (scrollView.contentOffset) == CGPoint(x: -750.0, y: 0.0) { print ("TEST OK LEFT") } if (scrollView.contentOffset) == CGPoint(x: 375, y: 0.0) { print ("TEST LEFT/RIGHT OK!") } } private func animateFadeTransition(to new: UIViewController, completion: (() -> Void)? = nil) { print ("Ca va dans animateFadeTransition") current.willMove(toParentViewController: nil) addChildViewController(new) transition(from: current, to: new, duration: 0.3, options: [.transitionCrossDissolve, .curveEaseOut], animations: { }) { completed in self.current.removeFromParentViewController() new.didMove(toParentViewController: self) self.current = new completion?() } } private func animateDismissTransition(to new: UIViewController, completion: (() -> Void)? = nil) { print ("Ca va dans animateDismissTransition") let initialFrame = CGRect(x: -view.bounds.width, y: 0, width: view.bounds.width, height: view.bounds.height) current.willMove(toParentViewController: nil) addChildViewController(new) new.view.frame = initialFrame transition(from: current, to: new, duration: 0.3, options: [], animations: { new.view.frame = self.view.bounds }) { completed in self.current.removeFromParentViewController() new.didMove(toParentViewController: self) self.current = new completion?() } } }and VerticalScrollViewController
/ MiddleScrollViewController.swift // SnapchatSwipeView // // Created by Jake Spracher on 12/14/15. // Copyright © 2015 Jake Spracher. All rights reserved. // import UIKit class VerticalScrollViewController: UIViewController, SnapContainerViewControllerDelegate { var topVc: UIViewController! var middleVc: UIViewController! var bottomVc: UIViewController! var scrollView: UIScrollView! class func verticalScrollVcWith(middleVc: UIViewController, topVc: UIViewController?=nil, bottomVc: UIViewController?=nil) -> VerticalScrollViewController { let middleScrollVc = VerticalScrollViewController() middleScrollVc.topVc = topVc middleScrollVc.middleVc = middleVc middleScrollVc.bottomVc = bottomVc return middleScrollVc } override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view: setupScrollView() } func setupScrollView() { scrollView = UIScrollView() scrollView.isPagingEnabled = true scrollView.showsVerticalScrollIndicator = false scrollView.bounces = false let view = ( x: self.view.bounds.origin.x, y: self.view.bounds.origin.y, width: self.view.bounds.width, height: self.view.bounds.height ) scrollView.frame = CGRect(x: view.x, y: view.y, width: view.width, height: view.height) self.view.addSubview(scrollView) let scrollWidth: CGFloat = view.width var scrollHeight: CGFloat switch (topVc, bottomVc) { case (nil, nil): scrollHeight = view.height middleVc.view.frame = CGRect(x: 0, y: 0, width: view.width, height: view.height) addChildViewController(middleVc) scrollView.addSubview(middleVc.view) middleVc.didMove(toParentViewController: self) case (_?, nil): scrollHeight = 2 * view.height topVc.view.frame = CGRect(x: 0, y: 0, width: view.width, height: view.height) middleVc.view.frame = CGRect(x: 0, y: view.height, width: view.width, height: view.height) addChildViewController(topVc) addChildViewController(middleVc) scrollView.addSubview(topVc.view) scrollView.addSubview(middleVc.view) topVc.didMove(toParentViewController: self) middleVc.didMove(toParentViewController: self) scrollView.contentOffset.y = middleVc.view.frame.origin.y case (nil, _?): scrollHeight = 2 * view.height middleVc.view.frame = CGRect(x: 0, y: 0, width: view.width, height: view.height) bottomVc.view.frame = CGRect(x: 0, y: view.height, width: view.width, height: view.height) addChildViewController(middleVc) addChildViewController(bottomVc) scrollView.addSubview(middleVc.view) scrollView.addSubview(bottomVc.view) middleVc.didMove(toParentViewController: self) bottomVc.didMove(toParentViewController: self) scrollView.contentOffset.y = 0 default: scrollHeight = 3 * view.height topVc.view.frame = CGRect(x: 0, y: 0, width: view.width, height: view.height) middleVc.view.frame = CGRect(x: 0, y: view.height, width: view.width, height: view.height) bottomVc.view.frame = CGRect(x: 0, y: 2 * view.height, width: view.width, height: view.height) addChildViewController(topVc) addChildViewController(middleVc) addChildViewController(bottomVc) scrollView.addSubview(topVc.view) scrollView.addSubview(middleVc.view) scrollView.addSubview(bottomVc.view) topVc.didMove(toParentViewController: self) middleVc.didMove(toParentViewController: self) bottomVc.didMove(toParentViewController: self) scrollView.contentOffset.y = middleVc.view.frame.origin.y } scrollView.contentSize = CGSize(width: scrollWidth, height: scrollHeight) } // MARK: - SnapContainerViewControllerDelegate Methods func outerScrollViewShouldScroll() -> Bool { if scrollView.contentOffset.y < middleVc.view.frame.origin.y || scrollView.contentOffset.y > 2*middleVc.view.frame.origin.y { return false } else { return true } } } -
Safe JSON Decoding. Still getting Key not found: No value associated with key'
IMGUR image search returns json:
{"data": [{ "title": "Family :)", "images": [{ "title": null, "description": null, "nsfw": null, "link": "https:\/\/i.imgur.com\/oe5BrCu.jpg", }] } ] }Model Object is configured:
struct ImgurResponse: Codable { let data: [ImageData] } struct ImageData: Codable { let title: String let images: [Image] } struct Image: Codable { let title, description, nsfw: String let link: String enum CodingKeys: String, CodingKey { case title case description case nsfw case link } init(from decoder: Decoder) throws { let container = try decoder.container(keyedBy: CodingKeys.self) title = try container.decodeIfPresent(String.self, forKey: .title) ?? "" description = try container.decodeIfPresent(String.self, forKey: .description) ?? "" nsfw = try container.decodeIfPresent(String.self, forKey: .nsfw) ?? "" link = try container.decodeIfPresent(String.self, forKey: .link) ?? "" }Calling JSONDecoder():
let response = try JSONDecoder().decode(ImgurResponse.self, from: data)When putting a brake point on the last line 'link = ' I land on it about 48 times. As i understand, we are able to create Image object 48 times.
Yet, im getting an error and 'response' isn't created:
Key 'CodingKeys(stringValue: "images", intValue: nil)' not found: No value associated with key CodingKeys(stringValue: "images", intValue: nil) ("images"). codingPath: [CodingKeys(stringValue: "data", intValue: nil), _JSONKey(stringValue: "Index 49", intValue: 49)]What other 'safe' decoding practices should I implement?
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Swift Codable: Decoding dynamic keys
I'm trying to practice Swift's Codable API. I send a network request and I receive one single line each time as follows where I have to deal with dynamic keys :
Response example 1:
{ "EUR": 4695.01 }Response example 2:
{ "USD": 479.01 }Response example 3:
{ "BTC": 4735.01 }I tried this method to parse the dynamic keys :
struct ConversionResponseModel: Decodable { typealias destinationCurrency = String init(from decoder: Decoder) throws { let container = try decoder.singleValueContainer() } }and my fetching request :
do { let myResult = try JSONDecoder().decode(ConversionResponseModel.self, from: data) print(myResult) } catch { print(error) }But I get this as a result :
ConversionResponseModel(), but not the currency values. It sounds like I'm missing something. Any help please. Thank you
