Swift UI 获取 JSON
Posted
技术标签:
【中文标题】Swift UI 获取 JSON【英文标题】：Swift UI fetching JSON 【发布时间】：2020-08-18 05:19:18 【问题描述】：所以我需要获取以下 JSON
"programs":["_id":"5d6b3e82bbe890f60cd0e4be","title":"3TO","link":"http://radiomedia.com.au","icon":"https://storage.googleapis.com/radiomediapodcast/ttto/3TO.jpg","banner":"https://storage.googleapis.com/radiomediapodcast/ttto/TTTO%20-%20BANNER.jpg","url":"ttto","station":["DRN1"],"category":"Comedy","description":"This That The Other (3TO) focuses on all things Pop Culture. Join Harry and Matt as they dive into some of your favourite things.","subtitle":"3TO everything from pop culture to movies to anything that is interesting","summary":"3TO everything from pop culture to movies to anything that is interesting","explicit":"no","active":true,"itunes_link":"https://podcasts.apple.com/au/podcast/3to/id1478540231","stitcher_link":"https://www.stitcher.com/s?fid=460120&refid=stpr","googlepodcast":"https://playmusic.app.goo.gl/?ibi=com.google.PlayMusic&isi=691797987&ius=googleplaymusic&apn=com.google.android.music&link=https://play.google.com/music/m/Ieckipkqa2umkhasjarwu37omxe?t%3D3TO%26pcampaignid%3DMKT-na-all-co-pr-mu-pod-16","_id":"5db6dc57c170710eb0e275df","title":"Fresh7@7","link":"http://drn1.com.au/shows/fresh7at7","icon":"https://storage.googleapis.com/radiomediapodcast/fresh7at7/fresh7at7icon.jpg","banner":"https://storage.googleapis.com/radiomediapodcast/fresh7at7/Fresh7%407BANNER.jpg","url":"fresh7at7","station":["DRN1"],"category":"Music","description":"Descrover the hottest indie music each week from around the world","subtitle":"Descrover the hottest indie music each week from around the world","summary":"Descrover the hottest indie music each week from around the world","explicit":"no","active":true,"itunes_link":"","stitcher_link":"","_id":"5e27cd3f4344393d8cd6a105","title":"Open Bar","link":"http://drn1.com.au/shows/openbar","icon":"https://storage.googleapis.com/radiomediapodcast/OpenBar/Open%20Bar-Logo.png","banner":"https://storage.googleapis.com/radiomediapodcast/OpenBar/OpenBarBanner.png","url":"openbar","category":"Arts","subcategory":"Food","description":"Join Blake, Paul & Nathan each week as they discuss all things beer, wine and spirits. As well as drinking they get to sit down with brewers from around Australia and the world and talk about the industries that inventions.","subtitle":"Join Blake, Paul & Nathan each week as they discuss all things beer, wine and spirits. As well as drinking they get to sit down with brewers from around Australia and the world and talk about the industries that inventions.","summary":"Join Blake, Paul & Nathan each week as they discuss all things beer, wine and spirits. As well as drinking they get to sit down with brewers from around Australia and the world and talk about the industries that inventions.","explicit":"no","station":["DRN1"],"day-air":["Tuesday"],"starttime-air":"18:00:00","endtime-air":"19:00:00","active":true,"itunes_link":"https://podcasts.apple.com/au/podcast/open-bar/id1495927932","stitcher_link":"https://www.stitcher.com/podcast/radio-media-pty-ltd-2/open-bar-2","googlepodcast":"https://playmusic.app.goo.gl/?ibi=com.google.PlayMusic&isi=691797987&ius=googleplaymusic&apn=com.google.android.music&link=https://play.google.com/music/m/I4idsbtya256jrywrq2e7owwg6u?t%3DOpen_Bar%26pcampaignid%3DMKT-na-all-co-pr-mu-pod-16","_id":"5e523b7f0cbaca2dec513419","title":"Behind The Goals","link":"http://drn1.com.au/shows/btg","icon":"https://storage.googleapis.com/radiomediapodcast/behindthegoals/BTGLogo.png","banner":"https://storage.googleapis.com/radiomediapodcast/behindthegoals/BTGBanner.png","url":"btg","category":"Sports","subcategory":"","description":"Join John and Anthony every Sunday morning to get your AFL fix. It's the footy show where we review all the games of the weekend and preview the remaining games on a Sunday. You'll get stats, news and banter but most of all, you'll get lots of fantasy football talk.","subtitle":"Join John and Anthony every Sunday morning to get your AFL fix. It's the footy show where we review all the games of the weekend and preview the remaining games on a Sunday. You'll get stats, news and banter but most of all, you'll get lots of fantasy football talk.","summary":"Join John and Anthony every Sunday morning to get your AFL fix. It's the footy show where we review all the games of the weekend and preview the remaining games on a Sunday. You'll get stats, news and banter but most of all, you'll get lots of fantasy football talk.","explicit":"no","station":["DRN1"],"day-air":["Sunday"],"starttime-air":"10:00:00","endtime-air":"12:00:00","active":true,"itunes_link":"https://podcasts.apple.com/au/podcast/behind-the-goals/id1500174427","stitcher_link":"https://www.stitcher.com/podcast/radio-media-pty-ltd-2/behind-the-goals-2","googlepodcast":"https://playmusic.app.goo.gl/?ibi=com.google.PlayMusic&isi=691797987&ius=googleplaymusic&apn=com.google.android.music&link=https://play.google.com/music/m/Iq7oa3hezzknb4plm7m3r7tfamq?t%3DBehind_The_Goals%26pcampaignid%3DMKT-na-all-co-pr-mu-pod-16","_id":"5e57a0380a55a21d804186eb","title":"El Ritmo De Vero","link":"http://drn1.com.au/shows/erdv","icon":"https://storage.googleapis.com/radiomediapodcast/ElritmodeVero/El%20ritmo%20de%20Vero.png","banner":"https://storage.googleapis.com/radiomediapodcast/ElritmodeVero/El%20ritmo%20de%20Vero-banner.png","url":"erdv","category":"Music","subcategory":"","description":"Nica Vero brings your an hour of latin music for your enjoyment every Thursday LIVE on DRN1 and replayed for our Spain listeners at 3pm local time (10pm Perth time)","subtitle":"Nica Vero brings your an hour of latin music for your enjoyment every Thursday LIVE on DRN1 and replayed for our Spain listeners at 3pm local time (10pm Perth time)","summary":"Nica Vero brings your an hour of latin music for your enjoyment every Thursday LIVE on DRN1 and replayed for our Spain listeners at 3pm local time (10pm Perth time)","explicit":"no","station":["DRN1"],"day-air":["Thursday"],"starttime-air":["10:00:00","22:00:00"],"endtime-air":["11:00:00","23:00:00"],"active":true,"itunes_link":"","stitcher_link":"","_id":"5e5b6caf0a55a21d804186f6","title":"Midday Marketing With Lynn","link":"http://drn1.com.au/shows/middaymarketing","icon":"https://storage.googleapis.com/radiomediapodcast/middaymarketing/logo.png","banner":"https://storage.googleapis.com/radiomediapodcast/middaymarketing/Midday%20Marketing%20Banner.png","url":"middaymarketing","category":"Business","subcategory":"Marketing","description":"Join marketing guru Lynn Loganathan each Sunday @ Midday for Midday Marketing. Where she sits down and has a chat to people in business and marketing. Each week Lynn and her guests give you some useful tips and tricks to making the most our of your marketing dollars.","subtitle":"Join marketing guru Lynn Loganathan each Sunday @ Midday for Midday Marketing. Where she sits down and has a chat to people in business and marketing. Each week Lynn and her guests give you some useful tips and tricks to making the most our of your marketing dollars.","summary":"Join marketing guru Lynn Loganathan each Sunday @ Midday for Midday Marketing. Where she sits down and has a chat to people in business and marketing. Each week Lynn and her guests give you some useful tips and tricks to making the most our of your marketing dollars.","explicit":"no","station":["DRN1"],"day-air":["Sunday"],"starttime-air":["12:00:00"],"endtime-air":["13:00:00"],"active":true,"itunes_link":"https://podcasts.apple.com/au/podcast/midday-marketing-with-lynn/id1501068720","stitcher_link":"https://www.stitcher.com/podcast/radio-media-pty-ltd-2/midday-marketing-with-lynn","googlepodcast":"https://playmusic.app.goo.gl/?ibi=com.google.PlayMusic&isi=691797987&ius=googleplaymusic&apn=com.google.android.music&link=https://play.google.com/music/m/Iyzungfizezvg6vhqrlxzgc3wga?t%3DMidday_Marketing_With_Lynn%26pcampaignid%3DMKT-na-all-co-pr-mu-pod-16","_id":"5e6630d3dfa2e000f814f85a","title":"Popculture News and Reviews","link":"http://drn1.com.au/shows/popculture","icon":"https://storage.googleapis.com/radiomediapodcast/popculturenewsandreviews/Logo.png","banner":"https://storage.googleapis.com/radiomediapodcast/popculturenewsandreviews/POPBANNER%20EVERY%20MONDAY.png","url":"popculture","category":"Society & Culture","subcategory":"","description":"Every Monday Anthony and Seve will be bringing you all the news in the world of Pop Culture! Movies, TV Shows, Video Games and Comics, if you’re a fan of it, we’ll be talking about it! Listen live at 4pm on DRN1 or download the podcast!","subtitle":"Every Monday Anthony and Seve will be bringing you all the news in the world of Pop Culture! Movies, TV Shows, Video Games and Comics, if you’re a fan of it, we’ll be talking about it! Listen live at 4pm on DRN1 or download the podcast!","summary":"Every Monday Anthony and Seve will be bringing you all the news in the world of Pop Culture! Movies, TV Shows, Video Games and Comics, if you’re a fan of it, we’ll be talking about it! Listen live at 4pm on DRN1 or download the podcast!","explicit":"no","station":["DRN1"],"day-air":["Monday"],"starttime-air":["16:00:00"],"endtime-air":["17:00:00"],"active":true,"itunes_link":"https://podcasts.apple.com/au/podcast/popculture-news-and-reviews/id1502095026","stitcher_link":"","googlepodcast":"https://playmusic.app.goo.gl/?ibi=com.google.PlayMusic&isi=691797987&ius=googleplaymusic&apn=com.google.android.music&link=https://play.google.com/music/m/I6dv4egekke5hmrd46haqw2r4sq?t%3DPopculture_News_and_Reviews%26pcampaignid%3DMKT-na-all-co-pr-mu-pod-16","_id":"5ebbd61635b7609ba9b2d7bc","title":"Bounce Back","link":"http://drn1.com.au/shows/bounceback","icon":"https://storage.googleapis.com/radiomediapodcast/bounceback/bounceback_logo.png","banner":"https://storage.googleapis.com/radiomediapodcast/bounceback/BounceBackBanner.jpg","url":"bounceback","category":"Comedy","subcategory":"","description":"Get ready for a laugh or two with Bounce Back with Yvonne Fletcher. Each week she invites two comedians to chat about their comedy past and future. This show will have you laughing all the way home.","subtitle":"Get ready for a laugh or two with Bounce Back with Yvonne Fletcher. Each week she invites two comedians to chat about their comedy past and future. This show will have you laughing all the way home.","summary":"Get ready for a laugh or two with Bounce Back with Yvonne Fletcher. Each week she invites two comedians to chat about their comedy past and future. This show will have you laughing all the way home.","explicit":"true","station":["DRN1"],"day-air":["Thursday"],"starttime-air":["19:00:00"],"endtime-air":["20:00:00"],"active":true,"itunes_link":"https://podcasts.apple.com/au/podcast/bounce-back/id1513169177","stitcher_link":"","_id":"5f27db2367cf8ffcc3a593d0","title":"Balls","link":"http://drn1.com.au/shows/balls","icon":"https://storage.googleapis.com/radiomediapodcast/Balls/ballslogo.jpg","banner":"https://storage.googleapis.com/radiomediapodcast/Balls/ballslogo.jpg","url":"balls","category":"Sports","subcategory":"Basketball","description":"Join BALLS every week as we have conversations with Trainers, Coaches, Athletes and others involved in the West Australian Basketball community and culture","subtitle":"Join BALLS every week as we have conversations with Trainers, Coaches, Athletes and others involved in the West Australian Basketball community and culture","summary":"Join BALLS every week as we have conversations with Trainers, Coaches, Athletes and others involved in the West Australian Basketball community and culture","explicit":"false","station":["DRN1"],"day-air":["Saturday"],"starttime-air":["13:30:00"],"endtime-air":["14:30:00"],"active":true,"itunes_link":"","stitcher_link":""]
来自 https://api.drn1.com.au/api-access/programs/DRN1
我认为这会起作用。
import SwiftUI
struct Post : Codable, Identifiable
let id = UUID()
var title : String
var icon : String
class Api
func getPosts(completion: @escaping ([Post]) -> ())
guard let url = URL(string: "https://api.drn1.com.au/api-access/programs/DRN1") else return
URLSession.shared.dataTask(with: url) (data, _, _) in
let posts = try! JSONDecoder().decode([Post].self, from: data['programs']!)
DispatchQueue.main.async
completion(posts)
.resume()
但是我遇到了错误，如何在程序中获取数据？
【问题讨论】：
这是如何引用 SwiftUI 框架的？我认为它不应该被标记为 [swiftui] - 它只是来自 Foundation 的带有 URLSession/JSONDecoder 的常规 swift 代码。 【参考方案1】：JSON 的顶层有一个参数programs，它又包含一个数组。你应该像这样更新你的代码
import SwiftUI
// Add this top level struct to
// decode properly
struct Post: Codable
var programs: [Program]
struct Program: Codable, Identifiable
let id = UUID()
var title : String
var icon : String
class Api
// Update this to return an array of Program
func getPosts(completion: @escaping ([Program]) -> ())
guard let url = URL(string: "https://api.drn1.com.au/api-access/programs/DRN1") else return
URLSession.shared.dataTask(with: url) (data, _, _) in
// Based on the updated structs, you would no
// longer be decoding an array
let post = try! JSONDecoder().decode(Post.self, from: data['programs']!)
DispatchQueue.main.async
// The array is stored under programs now
completion(post.programs)
.resume()
【讨论】：
无法将类型“[Program]”的值转换为预期的参数类型“[Post]” 对不起。我的错。我已经更新了答案。将func getPosts(completion: @escaping ([Post]) -> ()) 替换为func getPosts(completion: @escaping ([Program]) -> ())
谢谢，我可以看到这种编码方式的优势 - 但我必须说实话，它超出了我的规范。我现在正在尝试将其放入 Hstack 视图中，但它只是失败了。但是感谢您的回答 - 它确实有效。
要使Codable 工作，struct 或class 必须直接映射到 JSON。如果您需要任何更改，您可以编写自己的encode 和decode 方法来覆盖Codable 的默认实现
老实说，我开始觉得坚持使用 UIKit 更容易以上是关于Swift UI 获取 JSON的主要内容，如果未能解决你的问题，请参考以下文章