从 URL 解析 Swift 4 中的 JsonObject
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【中文标题】从 URL 解析 Swift 4 中的 JsonObject【英文标题】：Parsing a JsonObject in Swift 4 from an URL 【发布时间】：2018-02-12 21:46:23 【问题描述】：对我来说，这似乎是一项非常简单的任务，但即使经过大量研究和尝试，我也无法让它发挥作用......
例如，我有这个 URL，据我了解，这是 JSONObject 的 api？！
http://api.geekdo.com/api/images?ajax=1&gallery=all&nosession=1&objectid=127023&objecttype=thing&pageid=357&showcount=1&size=thumb&sort=recent
如果我在浏览器中打开此链接，我会得到以下结果：
"images":["imageid":"1567153","imageurl_lg":"https://cf.geekdo-images.com/images/pic1567153_lg.jpg","name":null,"caption “：“白色的 力量 瓦片","numrecommend":"6","numcmets":"0","user":"username":"manosdowns","avatar":"1","avatarfile":"avatar_id33829.jpg" ,"imageurl":"https://cf.geekdo-images.com/6fCr14v025ZKYhXRMnbhYR16Ta8=/fit-in/200x150/pic1567153.jpg"],"config":"sorttypes":["type":" hot","name":"Hot","type":"recent","name":"Recent"],"numitems":402,"endpage":402,"galleries":[" type":"all","name":"All","type":"game","name":"Game","type":"people","name":"People" ,"type":"creative","name":"Creative"],"categories":["type":"","name":"All","type":"BoxFront ","name":"BoxFront","type":"BoxBack","name":"BoxBack","type":"Components","name":"Components","type ":"自定义","name":"自定义","type":"播放","name":"播放","type":"Miscellaneous","name":"Miscellaneous" ,"type":"Mature","name":"Mature","type":"uncat","name":"Uncategorized"],"licensefilters":["type":"" ,"name":"Any","type":"reuse","name":"复制 允许","type":"commercial","name":"商业用途 允许","type":"modify","name":"修改 允许"],"datefilters":["value":"alltime","name":"All 时间","value":"today","name":"Today","value":"twodays","name":"两个 天数","value":"last7","name":"最后 7 个 天数","value":"last30","name":"最近 30 Days","value":"year","name":"Last 365 Days"],"filters":["name":"Licenses","listname":"licensefilters","type":"licensefilter","name":"Category","listname":" categories","type":"tag","name":"Gallery","listname":"gallery","type":"gallery"]
现在我的第一次尝试是用我解析主页的方式来解析这个链接：
guard let myURL = URL(string: link) else > print("Error: \(link) doesn't seem to be a valid URL") return do link = try String(contentsOf: myURL, encoding: .ascii) catch let error print("Error: \(error)")
但这不起作用，因为我现在明白这是因为这是 JSON 编码的？！
我搜索了解析 JSON 并找到了一些关于编码和解码的解释，但我的问题是，在所有给出的示例中，解释都是从已经“拥有”JsonObject 的内容开始的。 我的问题是我可以在浏览器中读取 URL 的内容，但我需要 Xcode 本身中的 URL 的内容，所以我可以解析它？！
所以在我的具体情况下，我只需要“imageurl_lg”的内容
...如果我可以在 Xcode 中显示我可以在浏览器中看到的内容，我会知道该怎么做 - 但是我如何将链接的内容获取到 Xcode 中？
作为参考，我还阅读了以下说明，但无法将它们应用于我的示例... https://www.raywenderlich.com/172145/encoding-decoding-and-serialization-in-swift-4
https://grokswift.com/json-swift-4/
还有一些，但他们没有帮助我......
【问题讨论】：
【参考方案1】：您需要使用 URLSession 任务来执行此操作，之后您需要使用 JSONSerialization 在此示例中我返回一个 [String:Any] 的字典，您可以将其转换为您需要的任何模型
使用此代码
func fetchData(completion: @escaping ([String:Any]?, Error?) -> Void)
let url = URL(string: "http://api.geekdo.com/api/images?ajax=1&gallery=all&nosession=1&objectid=127023&objecttype=thing&pageid=357&showcount=1&size=thumb&sort=recent")!
let task = URLSession.shared.dataTask(with: url) (data, response, error) in
guard let data = data else return
do
if let array = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [String:Any]
completion(array, nil)
catch
print(error)
completion(nil, error)
task.resume()
如何使用
override func viewDidLoad()
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
fetchData (dict, error) in
debugPrint(dict)
打印结果日志
Optional(["config":
categories = (
name = All;
type = "";
,
name = BoxFront;
type = BoxFront;
,
name = BoxBack;
type = BoxBack;
,
name = Components;
type = Components;
,
name = Customized;
type = Customized;
,
name = Play;
type = Play;
,
name = Miscellaneous;
type = Miscellaneous;
,
name = Mature;
type = Mature;
,
name = Uncategorized;
type = uncat;
);
datefilters = (
name = "All Time";
value = alltime;
,
name = Today;
value = today;
,
name = "Two Days";
value = twodays;
,
name = "Last 7 Days";
value = last7;
,
name = "Last 30 Days";
value = last30;
,
name = "Last 365 Days";
value = year;
);
endpage = 402;
filters = (
listname = licensefilters;
name = Licenses;
type = licensefilter;
,
listname = categories;
name = Category;
type = tag;
,
listname = galleries;
name = Gallery;
type = gallery;
);
galleries = (
name = All;
type = all;
,
name = Game;
type = game;
,
name = People;
type = people;
,
name = Creative;
type = creative;
);
licensefilters = (
name = Any;
type = "";
,
name = "Copying allowed";
type = reuse;
,
name = "Commercial use allowed";
type = commercial;
,
name = "Modification allowed";
type = modify;
);
numitems = 402;
sorttypes = (
name = Hot;
type = hot;
,
name = Recent;
type = recent;
); , "images": <__NSSingleObjectArrayI 0x600000010710>(
caption = "White power tiles";
imageid = 1567153;
imageurl = "https://cf.geekdo-images.com/6fCr14v025ZKYhXRMnbhYR16Ta8=/fit-in/200x150/pic1567153.jpg";
"imageurl_lg" = "https://cf.geekdo-images.com/images/pic1567153_lg.jpg";
name = "<null>";
numcomments = 0;
numrecommend = 6;
user =
avatar = 1;
avatarfile = "avatar_id33829.jpg";
username = manosdowns;
; ) ])
更新修复“App Transport Security 已阻止明文”错误
调整您的 info.plist
【讨论】：
谢谢，但现在我收到此错误：App Transport Security 已阻止明文 HTTP (http://) 资源加载，因为它不安全。可以通过应用程序的 Info.plist 文件配置临时例外。无法开始加载任务 .，因为它不符合 ATS 策略任务 . 完成并出现错误 - 代码： -1022 @MakiCodes 在你的 info.plist 中添加这些键检查我更新的答案 @MakiCodes 如果您需要进一步的帮助，请告诉我 没关系，将链接更改为“https”就足够了。一个大大的“谢谢”！【参考方案2】：这就是游乐场给我的。
import UIKit
var str = "Hello, playground"
func makeGetCall()
guard let myURL = URL(string: "http://api.geekdo.com/api/images?ajax=1&gallery=all&nosession=1&objectid=127023&objecttype=thing&pageid=357&showcount=1&size=thumb&sort=recent") else
print("Error: \(link) doesn't seem to be a valid URL")
return
do
var content = try String(contentsOf: myURL, encoding: .ascii)
print("Content: \(content)")
catch let error
print("Error: \(error)")
makeGetCall()
打印
【讨论】：
请不要推荐像String(contentsOf这样的同步方法。方法不合适。
这不是建议，只是对 OP 自己的答案的简单更正。我在上面看到了更好的答案，所以我不需要发布更多内容。
@Gihan 谢谢你！我知道同步方法不是首选方法，但是您按照我的要求回答了我的问题！ （我可能也需要实施您的解决方案！）
没问题，在你学习的时候跟上好的做法。而且您可能想要支持@einier 的答案，因为它非常详细并且会帮助您。干杯以上是关于从 URL 解析 Swift 4 中的 JsonObject的主要内容，如果未能解决你的问题，请参考以下文章