functionality for loading saved data from Core Data context
This commit is contained in:
CypherPoet
parent
1d919465d5
commit
0e3e5f0ba3
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@ -11,6 +11,7 @@
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F35ABF8C2233E65F00206C90 /* Commit+CoreDataProperties.swift in Sources */ = {isa = PBXBuildFile; fileRef = F35ABF8A2233E65F00206C90 /* Commit+CoreDataProperties.swift */; };
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F35ABF8E2233F5CE00206C90 /* GithubAPI.swift in Sources */ = {isa = PBXBuildFile; fileRef = F35ABF8D2233F5CE00206C90 /* GithubAPI.swift */; };
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F35ABF912234BDE000206C90 /* CodingUserInfoKey+Util.swift in Sources */ = {isa = PBXBuildFile; fileRef = F35ABF902234BDE000206C90 /* CodingUserInfoKey+Util.swift */; };
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F35ABFD22235548400206C90 /* UIViewController+Util.swift in Sources */ = {isa = PBXBuildFile; fileRef = F35ABFD12235548400206C90 /* UIViewController+Util.swift */; };
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F3A237752233870A00986BB6 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = F3A2376B2233870A00986BB6 /* Assets.xcassets */; };
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F3A237772233870A00986BB6 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = F3A2376F2233870A00986BB6 /* LaunchScreen.storyboard */; };
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F3A237782233870A00986BB6 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = F3A237702233870A00986BB6 /* AppDelegate.swift */; };
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@ -25,6 +26,7 @@
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F35ABF8A2233E65F00206C90 /* Commit+CoreDataProperties.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Commit+CoreDataProperties.swift"; sourceTree = "<group>"; };
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F35ABF8D2233F5CE00206C90 /* GithubAPI.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GithubAPI.swift; sourceTree = "<group>"; };
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F35ABF902234BDE000206C90 /* CodingUserInfoKey+Util.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "CodingUserInfoKey+Util.swift"; sourceTree = "<group>"; };
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F35ABFD12235548400206C90 /* UIViewController+Util.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIViewController+Util.swift"; sourceTree = "<group>"; };
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F3A2375422335D8100986BB6 /* Github Commits.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "Github Commits.app"; sourceTree = BUILT_PRODUCTS_DIR; };
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F3A2376B2233870A00986BB6 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
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F3A2376D2233870A00986BB6 /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
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@ -51,6 +53,7 @@
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isa = PBXGroup;
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children = (
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F35ABF902234BDE000206C90 /* CodingUserInfoKey+Util.swift */,
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F35ABFD12235548400206C90 /* UIViewController+Util.swift */,
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);
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path = Extensions;
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sourceTree = "<group>";
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@ -224,6 +227,7 @@
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F35ABF8B2233E65F00206C90 /* Commit+CoreDataClass.swift in Sources */,
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F3A2377A2233870A00986BB6 /* HomeViewController.swift in Sources */,
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F35ABF8C2233E65F00206C90 /* Commit+CoreDataProperties.swift in Sources */,
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F35ABFD22235548400206C90 /* UIViewController+Util.swift in Sources */,
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F35ABF8E2233F5CE00206C90 /* GithubAPI.swift in Sources */,
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F3A237842233C30200986BB6 /* GithubCommits.xcdatamodeld in Sources */,
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);
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@ -29,9 +29,15 @@ class HomeViewController: UITableViewController {
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DispatchQueue.global(qos: .background).async { [weak self] in
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self?.fetchCommits()
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}
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loadSavedData()
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}
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override func numberOfSections(in tableView: UITableView) -> Int {
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return 1
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}
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override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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return commits.count
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}
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@ -40,7 +46,7 @@ class HomeViewController: UITableViewController {
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let cell = tableView.dequeueReusableCell(withIdentifier: cellReuseIdentifier, for: indexPath)
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let commit = commits[indexPath.row]
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cell.textLabel?.text = commit.sha
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cell.textLabel?.text = commit.message
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cell.detailTextLabel?.text = commit.date.description
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return cell
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@ -55,7 +61,7 @@ class HomeViewController: UITableViewController {
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let data = try Data(contentsOf: commitsURL)
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parseCommits(fromJSON: data)
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} catch {
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fatalError("Error fetching data from Github API: \(error.localizedDescription)")
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showError(title: "Error fetching data from Github API", message: error.localizedDescription)
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}
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} else {
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fatalError("Error constructing URL to GitHub API")
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@ -74,15 +80,32 @@ class HomeViewController: UITableViewController {
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decoder.userInfo[mangedObjectContextKey] = managedObjectContext
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do {
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commits = try decoder.decode([Commit].self, from: json)
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print("Received \(commits.count) new commits")
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let commits = try decoder.decode([Commit].self, from: json)
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print("Parsed \(commits.count) new commits from API")
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DispatchQueue.main.async { [weak self] in
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// TODO: more with commits here?
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self?.saveData()
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self?.loadSavedData()
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}
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} catch {
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print("Error while parsing `Commit` json data:\n\n\(error.localizedDescription)")
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showError(title: "Error while parsing `Commit` json data", message: error.localizedDescription)
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}
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}
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func loadSavedData() {
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let fetchRequest = Commit.createFetchRequest()
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let sort1 = NSSortDescriptor(key: "date", ascending: false)
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let sort2 = NSSortDescriptor(key: "message", ascending: true)
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fetchRequest.sortDescriptors = [sort1, sort2]
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do {
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commits = try dataContainer.viewContext.fetch(fetchRequest)
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print("Fetched \(commits.count) from our persistent container context")
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tableView.reloadData()
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} catch {
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showError(title: "Error while fetching data from persistent container context", message: error.localizedDescription)
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}
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}
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@ -94,7 +117,7 @@ class HomeViewController: UITableViewController {
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print("Saving persistent data container view context")
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try dataContainer.viewContext.save()
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} catch {
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print("Error while saving persistent data store: \(error.localizedDescription)")
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showError(title: "Error while saving persistent data store", message: error.localizedDescription)
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}
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}
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}
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@ -0,0 +1,23 @@
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//
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// UIViewController+Util.swift
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// Github Commits
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//
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// Created by Brian Sipple on 3/10/19.
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// Copyright © 2019 Brian Sipple. All rights reserved.
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//
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import UIKit
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extension UIViewController {
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func showError(
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title: String,
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message: String = "",
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completionHandler: ((UIAlertAction) -> Void)? = nil
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) {
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let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
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alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: completionHandler))
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present(alertController, animated: true)
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}
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}
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@ -13,7 +13,7 @@ import CoreData
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extension Commit {
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@nonobjc public class func fetchRequest() -> NSFetchRequest<Commit> {
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@nonobjc public class func createFetchRequest() -> NSFetchRequest<Commit> {
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return NSFetchRequest<Commit>(entityName: "Commit")
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}
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