Saving Data in iOS

May 31 2022 · Swift 5.5, iOS 15, Xcode 13

Part 2: JSON

11. JSON Decoding

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Previous episode: 10. Introduction Next episode: 12. Challenge: Decoding JSON Arrays

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Notes: 11. JSON Decoding

Apple’s documentation on Encoding and Decoding Custom Types

This course was originally recorded in April 2020. It has been reviewed and all content and materials updated as of November 2021.

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This video is where you’ll learn about the JSON file format. Or, as some other people pronounce it, “Jason”. Regardless of how you say it, JSON is currently a very popular format for transmitting data over the web. Working with JSON supplied by web services is a frequent task in app development.

// MARK: - Private Methods
private func loadJSON() {
}

guard let taskJSONURL = Bundle.main.url(forResource: <#T##String?#>, withExtension: <#T##String?#>)

"Task"

"json"

guard let taskJSONURL = Bundle.main.url(forResource: "Task", withExtension: "json"),
  let prioritizedTaskJSONURL = Bundle.main.url(forResource: "PrioritizedTask", withExtension: "json") else {
    return
}

let decoder = JSONDecoder()

let taskData = Data(contentsOf: taskJSONURL)

do {
    let taskData = try Data(contentsOf: taskJSONURL)
  } catch let error {
    print(error)
}

let prioritizedTaskData = try Data(contentsOf: prioritizedTaskJSONURL)

let task = try decoder.decode(<#T##type: Decodable.Protocol##Decodable.Protocol#>, from: <#T##Data#>)
print(task)

let task = decoder.decode(Tesk.self, from: <#T##Data#>)

let task = decoder.decode(Task.self, from: taskData)

let task = try decoder.decode(Task.self, from: taskData)

struct Task: Identifiable, Codable {
	...
}

print(task)

onAppear {
  self.loadJSON()
}

let prioritizedTask = try decoder.decode(TaskStore.PrioritizedTasks.self, from: prioritizedTaskData)
print(prioritizedTask)

struct PrioritizedTasks, Codable {
  ...
}