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authorNicholas Tay <nick@windblume.net>2022-03-14 16:05:46 +1100
committerNicholas Tay <nick@windblume.net>2022-03-14 16:07:11 +1100
commit2f22931e0a4617dbd218a92c02bc9e83649ee6f7 (patch)
tree27116d24027c01ff14d4487dd33846d248bad25f /foray
parenta8c3db459cc1be105dd910efb8bbc08bc163fb91 (diff)
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Grouping items together by year
https://www.ralfebert.com/ios-examples/uikit/uitableviewcontroller/grouping-sections/
Diffstat (limited to '')
-rw-r--r--foray/ForayTableViewController.swift59
1 files changed, 49 insertions, 10 deletions
diff --git a/foray/ForayTableViewController.swift b/foray/ForayTableViewController.swift
index 66e9274..e283c9d 100644
--- a/foray/ForayTableViewController.swift
+++ b/foray/ForayTableViewController.swift
@@ -8,44 +8,80 @@
import UIKit
struct MyItem {
+ var releaseDate: Date
var id: String
var name: String
}
+struct YearSection {
+ var year: Date
+ var items: [MyItem]
+}
+
class ForayTableViewCell: UITableViewCell {
@IBOutlet weak var cellItemName: UILabel!
@IBOutlet weak var cellItemSubtitle: UILabel!
@IBOutlet weak var cellItemImage: UIImageView!
}
+// copied from sample project
+private func parseDate(_ str : String) -> Date {
+ let dateFormat = DateFormatter()
+ dateFormat.dateFormat = "yyyy-MM-dd"
+ return dateFormat.date(from: str)!
+}
+
+private func firstDayOfYear(date: Date) -> Date {
+ let calendar = Calendar.current
+ let components = calendar.dateComponents([.year], from: date)
+ return calendar.date(from: components)!
+}
+
class ForayTableViewController: UITableViewController {
// MARK: - Static data TEMP
let items = [
- MyItem(id: "mh", name: "Miners Helmet"),
- MyItem(id: "it", name: "Inner Tube"),
- MyItem(id: "tbg", name: "Toboggan"),
- MyItem(id: "spy", name: "Spy Phone"),
- MyItem(id: "bnb", name: "Black Ninja Belt"),
+ MyItem(releaseDate: parseDate("2006-05-26"), id: "mh", name: "Miners Helmet"),
+ MyItem(releaseDate: parseDate("2010-05-01"), id: "it", name: "Inner Tube"),
+ MyItem(releaseDate: parseDate("2009-04-24"), id: "tbg", name: "Toboggan"),
+ MyItem(releaseDate: parseDate("2006-03-29"), id: "spy", name: "Spy Phone"),
+ MyItem(releaseDate: parseDate("2008-11-18"), id: "bnb", name: "Black Ninja Belt"),
]
+ var sections = [YearSection]()
+
+ // MARK: - On load
+
+ override func viewDidLoad() {
+ super.viewDidLoad()
+
+ let groups = Dictionary(grouping: self.items) { (item) in
+ return firstDayOfYear(date: item.releaseDate)
+ }
+ self.sections = groups.map { (key, values) in
+ return YearSection(year: key, items: values)
+ }
+ // Sort the sections from oldest year to newest
+ self.sections.sort { (lhs, rhs) in lhs.year < rhs.year }
+ }
+
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// Returns number of sections for table
- return 1
+ return self.sections.count
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
- // Returns number of rows for table
- return items.count
+ // Returns number of rows for table's section
+ return self.sections[section].items.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ForayCell", for: indexPath) as! ForayTableViewCell
- let item = items[indexPath.row]
+ let item = self.sections[indexPath.section].items[indexPath.row]
cell.cellItemName?.text = item.name
cell.cellItemSubtitle?.text = "Item ID: \(item.id)"
cell.cellItemImage?.image = UIImage(named: item.id)
@@ -54,6 +90,9 @@ class ForayTableViewController: UITableViewController {
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
- return "Section \(section)"
+ let section = self.sections[section]
+ let dateFormatter = DateFormatter()
+ dateFormatter.dateFormat = "yyyy"
+ return "Released in " + dateFormatter.string(from: section.year)
}
}