This is the data model I used to import a json file.
struct ActionResult: Codable {
let data: [Datum]
}
struct Datum: Codable {
let goalTitle, goalDescription, goalImage: String
let action: [Action]
}
struct Action: Codable {
let actionTitle: String
let actionGoal: String
Now I am trying to create a searchbar, but it only searches in one section, although I have not defined a section in the data model but it is picking either the goalTitle or actionGoal.
var index = 0
var action: Action? // this is for the segue
var result: ActionResult? {
didSet {
guard let result = result else { return }
allSectionDataActionMap = Dictionary(uniqueKeysWithValues: result.data.enumerated().map { ($0.0, ($0.1, $0.1.action)) })
updateFilteredData()
}
}
var allSectionDataActionMap = [Int: (datum: Datum, actions: [Action])]()
// Maps the section index to the Datum & filtered [Action]
var filteredSectionDataActions = [Int: (datum: Datum, actions: [Action])]()
let searchController = UISearchController()
This is part of the setup code.
override func numberOfSections(in tableView: UITableView) -> Int {
return filteredSectionDataActions.count
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return filteredSectionDataActions[section]?.actions.count ?? 0
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = ActionTableView.dequeueReusableCell(withIdentifier: "ActionCell", for: indexPath) as! ActionTableCell
let action = filteredSectionDataActions[indexPath.section]?.actions[indexPath.row]
// setup cell for action
cell.actionItem.text = action?.actionTitle
cell.actionImage.image = UIImage(named: action!.actionImage)
cell.actionImage.layer.cornerRadius = cell.actionImage.frame.size.width / 2
cell.actionGoal.text = action?.actionGoal
// cell.actionBenefit.text = action?.actionBenefit
// cell.actionCalculator.text = action?.actionCalculator
This is the table view code
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
updateFilteredData(for: searchText.lowercased())
tableView.reloadData()
}
func updateFilteredData(for searchText: String = String()) {
if searchText.isEmpty {
filteredSectionDataActions = allSectionDataActionMap
} else {
for (index, (datum, actions)) in allSectionDataActionMap {
let filteredActions = actions.filter { $0.actionTitle.lowercased().contains(searchText) }
if filteredActions.isEmpty {
filteredSectionDataActions[index] = (datum, actions)
} else {
filteredSectionDataActions[index] = (datum, filteredActions)
}
This is for the searchbar.
I have table view like this (in a mac cocoa application):
In the leftmost panel you can see that I have set the identifier of the Table Cell View to "1". That's fine if you just have 2 columns, once the number goes up, this approach will become cumbersome. Can I do this programmatically?
Here is an example:
import Cocoa
class ViewController: NSViewController, NSTableViewDelegate, NSTableViewDataSource {
private var dataModel = DataModel()
private var answer = 0
private var keyData: (Int, [Int]) = (0, []) {
didSet {
tbl.reloadData()
}
}
#IBOutlet weak var questionIndex: NSTextField!
#IBOutlet weak var tbl: NSTableView!
#IBAction func replay(_ sender: Any) {
dataModel = DataModel()
questionIndex.stringValue = "0:"
answer = 0
updateModel()
}
#IBAction func forward(_ sender: NSButton) {
if sender.tag == 1 {
answer += keyData.0
}
updateModel()
}
func updateModel() {
let group = dataModel.nextGroup()
if let g = group {
self.keyData = g
let s = questionIndex.stringValue
questionIndex.stringValue = String(Int(String(s.characters.dropLast()))! + 1) + ":"
return
}
let alert = NSAlert()
alert.messageText = "You did have \(answer) on your mind, didn't you?"
alert.runModal()
}
override func viewDidLoad() {
super.viewDidLoad()
for (n, col) in tbl.tableColumns.enumerated() {
col.identifier = String(n)
}
updateModel()
}
func numberOfRows(in tableView: NSTableView) -> Int {
return keyData.1.count / 8 + 1
}
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
let colId = tableColumn!.identifier
let colIndex = Int(colId)!
let index = (row * 8) + colIndex
let cell = tbl.make(withIdentifier: colId, owner: self) as! NSTableCellView
if 0 <= index && index < keyData.1.count {
cell.textField!.integerValue = keyData.1[index]
} else {
cell.textField!.stringValue = ""
}
return cell
}
override var representedObject: Any? {
didSet {
// Update the view, if already loaded.
}
}
}
I have assigned the cell identifiers by hand, and made them identical the corresponding column index, so as to creating a mapping between the cell id and the 2D array (which is the underlying data model) column index. The app is running fine, I just don't like assigning these IDs by click-and-point.
The full project can be found here: https://github.com/kindlychung/MysteriousNum
Create custom cell and add init to it using following lines.
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
}
and register this cell class as.
self.tableView.register(CustomCell.self, forCellReuseIdentifier: "customCell")
also dequeueReusableCell using same cell like:
tableView.dequeueReusableCell(withIdentifier: "customCell",for: indexPath) as! CustomCell
I am struggling to figure out how to implement a sectioned table view using parse. I am able to correctly section the table view if I don't load the names I want. However, when I use parse the names don't load in time and therefore are missed as it is async.
When I reload the table in queryFriends() it doesn't show up. My theory is that the table isn't sectioned again.
How do I make the table section again?
Or does anyone have any ideas?
Thanks for your help
import UIKit
import Parse
import Foundation
class MyFriendsTableView: UITableViewController, UITableViewDataSource, UITableViewDelegate{
var names:[String] = []
/*var names: [String] = [
"AAAA",
"Clementine",
"Bessie",
"Yolande",
"Tynisha",
"Ellyn",
"Trudy",
"Fredrick",
"Letisha",
"Ariel",
"Bong",
"Jacinto",
"Dorinda",
"Aiko",
"Loma",
"Augustina",
"Margarita",
"Jesenia",
"Kellee",
"Annis",
"Charlena",
"!##",
"###"
]*/
override func viewDidLoad() {
super.viewDidLoad()
self.refreshControl = UIRefreshControl()
self.refreshControl?.attributedTitle = NSAttributedString(string: "Pull to refresh")
self.refreshControl?.addTarget(self, action: "queryFriends", forControlEvents: UIControlEvents.ValueChanged)
self.tableView.addSubview(refreshControl!)
}
override func viewDidAppear(animated: Bool) {
UIApplication.sharedApplication().statusBarHidden = false
UIApplication.sharedApplication().statusBarStyle = UIStatusBarStyle.LightContent
queryFriends()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func queryFriends() {
let currentUser = PFUser.currentUser()?.username
let predicate = NSPredicate(format: "status = 'Friends' AND fromUser = %# OR status = 'Friends' AND toUser = %#", currentUser!, currentUser!)
var query = PFQuery(className: "FriendRequest", predicate: predicate)
var friends:[String] = []
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
if let objects = objects as? [PFObject] {
for object in objects {
if object["toUser"] as? String != currentUser {
friends.append(object["toUser"] as! String)
} else if object["fromUser"] as? String != currentUser {
friends.append(object["fromUser"] as! String)
}
}
}
} else {
// Log details of the failure
println("Error: \(error!) \(error!.userInfo!)")
}
self.names = friends
self.tableView.reloadData()
self.refreshControl?.endRefreshing()
}
}
/* type to represent table items
`section` stores a `UITableView` section */
class User: NSObject {
let name: String
var section: Int?
init(name: String) {
self.name = name
}
}
// custom type to represent table sections
class Section {
var users: [User] = []
func addUser(user: User) {
self.users.append(user)
}
}
// `UIKit` convenience class for sectioning a table
let collation = UILocalizedIndexedCollation.currentCollation()
as! UILocalizedIndexedCollation
// table sections
var sections: [Section] {
// return if already initialized
if self._sections != nil {
return self._sections!
}
// create users from the name list
var users: [User] = names.map { name in
var user = User(name: name)
user.section = self.collation.sectionForObject(user, collationStringSelector: "name")
return user
}
// create empty sections
var sections = [Section]()
for i in 0..<self.collation.sectionIndexTitles.count {
sections.append(Section())
}
// put each user in a section
for user in users {
sections[user.section!].addUser(user)
}
// sort each section
for section in sections {
section.users = self.collation.sortedArrayFromArray(section.users, collationStringSelector: "name") as! [User]
}
self._sections = sections
return self._sections!
}
var _sections: [Section]?
// table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return self.sections.count
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.sections[section].users.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let user = self.sections[indexPath.section].users[indexPath.row]
let cell = tableView.dequeueReusableCellWithIdentifier("UITableViewCell", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel!.text = user.name
return cell
}
/* section headers
appear above each `UITableView` section */
override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
// do not display empty `Section`s
if !self.sections[section].users.isEmpty {
return self.collation.sectionTitles[section] as? String
}
return ""
}
/* section index titles
displayed to the right of the `UITableView` */
override func sectionIndexTitlesForTableView(tableView: UITableView) -> [AnyObject] {
return self.collation.sectionIndexTitles
}
override func tableView(tableView: UITableView, sectionForSectionIndexTitle title: String, atIndex index: Int) -> Int {
return self.collation.sectionForSectionIndexTitleAtIndex(index)
}
}
You can try to clear the _sections in queryFriends:
self._sections = nil
self.names = friends
self.tableView.reloadData()
self.refreshControl?.endRefreshing()
I have implemented a basic example of an ios app using Realm.io
I'd like to be able to reorder table rows in my iOS app and save the order back to Realm.
Realm model contains a property called position for this purpose.
P.S: Sorry for so much code.
import UIKit
import Realm
class Cell: UITableViewCell {
var position: Int!
init(style: UITableViewCellStyle, reuseIdentifier: String!) {
super.init(style: .Subtitle, reuseIdentifier: reuseIdentifier)
}
}
class Language: RLMObject {
var title = ""
var position = Int()
}
class ManagerLanguagesController: UITableViewController, UITableViewDelegate, UITableViewDataSource {
var array = RLMArray()
var notificationToken: RLMNotificationToken?
var editButton = UIBarButtonItem()
override func viewDidLoad() {
super.viewDidLoad()
setupUI()
notificationToken = RLMRealm.defaultRealm().addNotificationBlock { note, realm in
self.reloadData()
}
reloadData()
}
override func tableView(tableView: UITableView?, numberOfRowsInSection section: Int) -> Int {
return Int(array.count)
}
func setupUI() {
tableView.registerClass(Cell.self, forCellReuseIdentifier: "cell")
self.title = "Languages"
var addButton = UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "add")
editButton = UIBarButtonItem(title: "Edit", style: .Plain, target: self, action: "edit")
var buttons = [addButton, editButton]
self.navigationItem.rightBarButtonItems = buttons
}
func add() {
var addLanguageView:UIViewController = self.storyboard.instantiateViewControllerWithIdentifier("newLanguage") as UIViewController
self.navigationController.presentViewController(addLanguageView, animated: true, completion: nil)
}
func edit () {
if tableView.editing {
/* FROM THIS POINT I'M PROBABLY DOING SOMETHING WRONG.. IT IS NOT WORKING */
var positionArray = NSMutableArray()
let realm = RLMRealm.defaultRealm()
var i = 0
for var row = 0; row < tableView.numberOfRowsInSection(0); row++ {
var cellPath = NSIndexPath(forRow: row, inSection: 0)
var cell:Cell = tableView.cellForRowAtIndexPath(cellPath) as Cell
positionArray.addObject(cell.position)
}
realm.beginWriteTransaction()
for row: RLMObject in array {
row["position"] = positionArray[i]
i++
}
realm.commitWriteTransaction()
/* -- NOT WORKING END -- */
tableView.setEditing(false, animated: true)
editButton.style = UIBarButtonItemStyle.Plain
editButton.title = "Edit"
} else{
tableView.setEditing(true, animated: true)
editButton.title = "Done"
editButton.style = UIBarButtonItemStyle.Done
}
}
override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?) -> UITableViewCell? {
let cell = tableView!.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as Cell
let object = array[UInt(indexPath!.row)] as Language
cell.textLabel.text = object.title
cell.position = object.position // I have implemented this to be able to retain initial positions for each row and maybe use this when reordering..
return cell
}
override func tableView(tableView: UITableView!, canMoveRowAtIndexPath indexPath: NSIndexPath!) -> Bool {
return true
}
override func tableView(tableView: UITableView!, moveRowAtIndexPath sourceIndexPath: NSIndexPath!, toIndexPath destinationIndexPath: NSIndexPath!) {
// println("Old index: \(sourceIndexPath.indexAtPosition(sourceIndexPath.length - 1)+1)")
// println("New index: \(destinationIndexPath.indexAtPosition(sourceIndexPath.length - 1)+1)")
// Maybe something needs to be implemented here instead...
}
func reloadData() {
array = Language.allObjects().arraySortedByProperty("position", ascending: true)
tableView.reloadData()
}
}
Thanks in advance
Instead of using a position property, you could instead keep an ordered array as a property on another object. This way you don't have to keep the position up to date and instead arrange your objects as needed:
class Language: RLMObject {
dynamic var title = ""
}
class LanguageList: RLMObject {
dynamic var languages = RLMArray(objectClassName: "Language")
}
class ManagerLanguagesController: UITableViewController, UITableViewDelegate, UITableViewDataSource {
override func viewDidLoad() {
super.viewDidLoad()
// create our list
var realm = RLMRealm.defaultRealm()
realm.beginWriteTransaction()
realm.addObject(LanguageList())
realm.commitWriteTransaction()
...
}
// helper to get the RLMArray of languages in our list
func array() -> RLMArray {
return (LanguageList.allObjects().firstObject() as LanguageList).languages
}
override func tableView(tableView: UITableView!, moveRowAtIndexPath sourceIndexPath: NSIndexPath!, toIndexPath destinationIndexPath: NSIndexPath!) {
var languages = array()
var object = languages.objectAtIndex(UInt(sourceIndexPath.row)) as Language
var realm = RLMRealm.defaultRealm()
realm.beginWriteTransaction()
languages.removeObjectAtIndex(UInt(sourceIndexPath.row))
languages.insertObject(object, atIndex: UInt(destinationIndexPath.row))
realm.commitWriteTransaction()
}
...
}
this work for me to move rows in tableview using realm with swift 2.2:
func tableView(tableView: UITableView, moveRowAtIndexPath fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath) {
let aux = TimesHome.mutableCopy() as! NSMutableArray
let itemToMove = aux[fromIndexPath.row]
let realm = try! Realm()
realm.beginWrite()
aux.removeObjectAtIndex(fromIndexPath.row)
aux.insertObject(itemToMove, atIndex: toIndexPath.row)
try! realm.commitWrite()
TimesHome = aux
let times = realm.objects(ParciaisTimes)
if times.count > 0 {
for tm in times {
for i in 1...aux.count {
if aux[i-1].valueForKey("time_id") as! Int == tm.time_id {
realm.beginWrite()
tm.ordem = i
try! realm.commitWrite()
}
}
}
}
}
I was just wondering if there was an easy way to set an NSTableView to allow it to reorder its rows without writing any pasteboard code. I only need it to be able to do this internally, within one table. I have no issue writing the pboard code, except that I'm fairly sure that I saw Interface Builder have a toggle for this somewhere / saw it working by default. It certainly seems like a common enough task.
Thanks
Set your table view's datasource to be a class that conforms to NSTableViewDataSource.
Put this in an appropriate place (-applicationWillFinishLaunching, -awakeFromNib, -viewDidLoad or something similar):
tableView.registerForDraggedTypes(["public.data"])
Then implement these three NSTableViewDataSource methods:
tableView:pasteboardWriterForRow:
tableView:validateDrop:proposedRow:proposedDropOperation:
tableView:acceptDrop:row:dropOperation:
Here is fully-working code that supports drag-and-drop reordering multiple rows:
func tableView(tableView: NSTableView, pasteboardWriterForRow row: Int) -> NSPasteboardWriting? {
let item = NSPasteboardItem()
item.setString(String(row), forType: "public.data")
return item
}
func tableView(tableView: NSTableView, validateDrop info: NSDraggingInfo, proposedRow row: Int, proposedDropOperation dropOperation: NSTableViewDropOperation) -> NSDragOperation {
if dropOperation == .Above {
return .Move
}
return .None
}
func tableView(tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableViewDropOperation) -> Bool {
var oldIndexes = [Int]()
info.enumerateDraggingItemsWithOptions([], forView: tableView, classes: [NSPasteboardItem.self], searchOptions: [:]) {
if let str = ($0.0.item as! NSPasteboardItem).stringForType("public.data"), index = Int(str) {
oldIndexes.append(index)
}
}
var oldIndexOffset = 0
var newIndexOffset = 0
// For simplicity, the code below uses `tableView.moveRowAtIndex` to move rows around directly.
// You may want to move rows in your content array and then call `tableView.reloadData()` instead.
tableView.beginUpdates()
for oldIndex in oldIndexes {
if oldIndex < row {
tableView.moveRowAtIndex(oldIndex + oldIndexOffset, toIndex: row - 1)
--oldIndexOffset
} else {
tableView.moveRowAtIndex(oldIndex, toIndex: row + newIndexOffset)
++newIndexOffset
}
}
tableView.endUpdates()
return true
}
Swift 3 version:
func tableView(_ tableView: NSTableView, pasteboardWriterForRow row: Int) -> NSPasteboardWriting? {
let item = NSPasteboardItem()
item.setString(String(row), forType: "private.table-row")
return item
}
func tableView(_ tableView: NSTableView, validateDrop info: NSDraggingInfo, proposedRow row: Int, proposedDropOperation dropOperation: NSTableViewDropOperation) -> NSDragOperation {
if dropOperation == .above {
return .move
}
return []
}
func tableView(_ tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableViewDropOperation) -> Bool {
var oldIndexes = [Int]()
info.enumerateDraggingItems(options: [], for: tableView, classes: [NSPasteboardItem.self], searchOptions: [:]) {
if let str = ($0.0.item as! NSPasteboardItem).string(forType: "private.table-row"), let index = Int(str) {
oldIndexes.append(index)
}
}
var oldIndexOffset = 0
var newIndexOffset = 0
// For simplicity, the code below uses `tableView.moveRowAtIndex` to move rows around directly.
// You may want to move rows in your content array and then call `tableView.reloadData()` instead.
tableView.beginUpdates()
for oldIndex in oldIndexes {
if oldIndex < row {
tableView.moveRow(at: oldIndex + oldIndexOffset, to: row - 1)
oldIndexOffset -= 1
} else {
tableView.moveRow(at: oldIndex, to: row + newIndexOffset)
newIndexOffset += 1
}
}
tableView.endUpdates()
return true
}
If you take a look at the tool tip in IB you'll see that the option you refer to
- (BOOL)allowsColumnReordering
controls, well, column reordering. I do not believe there is any other way to do this other than the standard drag-and-drop API for table views.
EDIT: ( 2012-11-25 )
The answer refers to drag-and-drop reordering of NSTableViewColumns; and while it was the accepted answer at the time. It does not appear, now nearly 3 years on, to be correct. In service of making the information useful to searchers, I'll attempt to give the more correct answer.
There is no setting that allows drag and drop reordering of NSTableView rows in Interface Builder. You need to implement certain NSTableViewDataSource methods, including:
- tableView:acceptDrop:row:dropOperation:
- (NSDragOperation)tableView:(NSTableView *)aTableView validateDrop:(id < NSDraggingInfo >)info proposedRow:(NSInteger)row proposedDropOperation:(NSTableViewDropOperation)operation
- (BOOL)tableView:(NSTableView *)aTableView writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard *)pboard
There are other SO question that address this reasonably thoroughly, including this one
Apple link to Drag and Drop APIs.
#Ethan's solution - Update Swift 4
in viewDidLoad :
private var dragDropType = NSPasteboard.PasteboardType(rawValue: "private.table-row")
override func viewDidLoad() {
super.viewDidLoad()
myTableView.delegate = self
myTableView.dataSource = self
myTableView.registerForDraggedTypes([dragDropType])
}
Later on delegate extension :
extension MyViewController: NSTableViewDelegate, NSTableViewDataSource {
// numerbOfRow and viewForTableColumn methods
func tableView(_ tableView: NSTableView, pasteboardWriterForRow row: Int) -> NSPasteboardWriting? {
let item = NSPasteboardItem()
item.setString(String(row), forType: self.dragDropType)
return item
}
func tableView(_ tableView: NSTableView, validateDrop info: NSDraggingInfo, proposedRow row: Int, proposedDropOperation dropOperation: NSTableView.DropOperation) -> NSDragOperation {
if dropOperation == .above {
return .move
}
return []
}
func tableView(_ tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableView.DropOperation) -> Bool {
var oldIndexes = [Int]()
info.enumerateDraggingItems(options: [], for: tableView, classes: [NSPasteboardItem.self], searchOptions: [:]) { dragItem, _, _ in
if let str = (dragItem.item as! NSPasteboardItem).string(forType: self.dragDropType), let index = Int(str) {
oldIndexes.append(index)
}
}
var oldIndexOffset = 0
var newIndexOffset = 0
// For simplicity, the code below uses `tableView.moveRowAtIndex` to move rows around directly.
// You may want to move rows in your content array and then call `tableView.reloadData()` instead.
tableView.beginUpdates()
for oldIndex in oldIndexes {
if oldIndex < row {
tableView.moveRow(at: oldIndex + oldIndexOffset, to: row - 1)
oldIndexOffset -= 1
} else {
tableView.moveRow(at: oldIndex, to: row + newIndexOffset)
newIndexOffset += 1
}
}
tableView.endUpdates()
return true
}
}
Plus, for those it may concerne:
If you want to disable certain cells from being dragable, return nil in pasteboardWriterForRows method
If you want to prevent drop a certain locations ( too far for instance ) just use return [] in validateDrop's method
Do not call tableView.reloadData() synchronously inside func tableView(_ tableView:, acceptDrop info:, row:, dropOperation:). This will disturb Drag and Drop animation, and can be very confusing. Find a way to wait until animation finishes, and async it's reloading
This answer covers Swift 3, View-based NSTableViews and single/multiple rows drag&drop reorder.
There are 2 main steps which must be performed in order to achieve this:
Register table view to a specifically allowed type of object which can be dragged.
tableView.register(forDraggedTypes: ["SomeType"])
Implement 3 NSTableViewDataSource methods: writeRowsWith, validateDrop and acceptDrop.
Before drag operation has started, store IndexSet with indexes of rows which will be dragged, in the pasteboard.
func tableView(_ tableView: NSTableView, writeRowsWith rowIndexes: IndexSet, to pboard: NSPasteboard) -> Bool {
let data = NSKeyedArchiver.archivedData(withRootObject: rowIndexes)
pboard.declareTypes(["SomeType"], owner: self)
pboard.setData(data, forType: "SomeType")
return true
}
Validate drop only if dragging operation is above of specified row. This ensures when dragging is performed other rows won't be highlighted when dragged row will float above them. Also, this fixes an AutoLayout issue.
func tableView(_ tableView: NSTableView, validateDrop info: NSDraggingInfo, proposedRow row: Int,
proposedDropOperation dropOperation: NSTableViewDropOperation) -> NSDragOperation {
if dropOperation == .above {
return .move
} else {
return []
}
}
When accepting drop just retrieve IndexSet that previously was saved in the pasteboard,
iterate through it and move rows using calculated indexes.
Note: Part with iteration and row moving I've copied from #Ethan's answer.
func tableView(_ tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableViewDropOperation) -> Bool {
let pasteboard = info.draggingPasteboard()
let pasteboardData = pasteboard.data(forType: "SomeType")
if let pasteboardData = pasteboardData {
if let rowIndexes = NSKeyedUnarchiver.unarchiveObject(with: pasteboardData) as? IndexSet {
var oldIndexOffset = 0
var newIndexOffset = 0
for oldIndex in rowIndexes {
if oldIndex < row {
// Dont' forget to update model
tableView.moveRow(at: oldIndex + oldIndexOffset, to: row - 1)
oldIndexOffset -= 1
} else {
// Dont' forget to update model
tableView.moveRow(at: oldIndex, to: row + newIndexOffset)
newIndexOffset += 1
}
}
}
}
return true
}
View-based NSTableViews update themselfs when moveRow is called, there is no need to use beginUpdates() and endUpdates() block.
Unfortunately you do have to write the Paste board code. The Drag and Drop API is fairly generic which makes it very flexible. However, if you just need reordering it's a bit over-the-top IMHO. But anyway, I have created a small sample project which has an NSOutlineView where you can add and remove items as well as reorder them.
This is not an NSTableView but the implementation of the Drag & Drop protocol is basically identical.
I implemented drag and Drop in one go so it's best to look at this commit.
If your are moving only one row at the time you can use the following code:
func tableView(_ tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableViewDropOperation) -> Bool {
let pasteboard = info.draggingPasteboard()
guard let pasteboardData = pasteboard.data(forType: basicTableViewDragAndDropDataType) else { return false }
guard let rowIndexes = NSKeyedUnarchiver.unarchiveObject(with: pasteboardData) as? IndexSet else { return false }
guard let oldIndex = rowIndexes.first else { return false }
let newIndex = oldIndex < row ? row - 1 : row
tableView.moveRow(at: oldIndex, to: newIndex)
// Dont' forget to update model
return true
}
This is an update to #Ethan's answer for Swift 3:
let dragDropTypeId = "public.data" // or any other UTI you want/need
func tableView(_ tableView: NSTableView, pasteboardWriterForRow row: Int) -> NSPasteboardWriting? {
let item = NSPasteboardItem()
item.setString(String(row), forType: dragDropTypeId)
return item
}
func tableView(_ tableView: NSTableView, validateDrop info: NSDraggingInfo, proposedRow row: Int, proposedDropOperation dropOperation: NSTableViewDropOperation) -> NSDragOperation {
if dropOperation == .above {
return .move
}
return []
}
func tableView(_ tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableViewDropOperation) -> Bool {
var oldIndexes = [Int]()
info.enumerateDraggingItems(options: [], for: tableView, classes: [NSPasteboardItem.self], searchOptions: [:]) {
if let str = ($0.0.item as! NSPasteboardItem).string(forType: self.dragDropTypeId), let index = Int(str) {
oldIndexes.append(index)
}
}
var oldIndexOffset = 0
var newIndexOffset = 0
// For simplicity, the code below uses `tableView.moveRowAtIndex` to move rows around directly.
// You may want to move rows in your content array and then call `tableView.reloadData()` instead.
tableView.beginUpdates()
for oldIndex in oldIndexes {
if oldIndex < row {
tableView.moveRow(at: oldIndex + oldIndexOffset, to: row - 1)
oldIndexOffset -= 1
} else {
tableView.moveRow(at: oldIndex, to: row + newIndexOffset)
newIndexOffset += 1
}
}
tableView.endUpdates()
self.reloadDataIntoArrayController()
return true
}
Swift 5 solution. I had to add 'registerForDraggedTypes' method in viewDidLoad for this to work.
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
tableView.dataSource = self
tableView.delegate = self
// you must register the type you want to drag-n-drop! in this case 'strings'
tableView.registerForDraggedTypes([.string])
self.mapView.fitAll(in: teamManager.group.teams(), andShow: true)
}
extension ViewController : NSTableViewDataSource {
func numberOfRows(in tableView: NSTableView) -> Int {
return dataModel.count // or whatever
}
func tableView(_ tableView: NSTableView, pasteboardWriterForRow row: Int) -> NSPasteboardWriting? {
let pasteboard = NSPasteboardItem()
// in this example I'm dragging the row index. Once dropped i'll look up the value that is moving by using this.
// remember in viewdidload I registered strings so I must set strings to pasteboard
pasteboard.setString("\(row)", forType: .string)
return pasteboard
}
func tableView(_ tableView: NSTableView, validateDrop info: NSDraggingInfo, proposedRow row: Int, proposedDropOperation dropOperation: NSTableView.DropOperation) -> NSDragOperation {
let canDrop = (row > 2) // in this example you cannot drop on top two rows
print("valid drop \(row)? \(canDrop)")
if (canDrop) {
return .move //yes, you can drop on this row
}
else {
return [] // an empty array is the equivalent of nil or 'cannot drop'
}
}
func tableView(_ tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableView.DropOperation) -> Bool {
let pastboard = info.draggingPasteboard
if let sourceRowString = pastboard.string(forType: .string) {
print("from \(sourceRowString). dropping row \(row)")
return true
}
return false
}
}
Here is the fully working code in swift 5. Lets you move multiple items at once!
override func viewDidLoad() {
super.viewDidLoad()
myTableView.delegate = self
myTableView.dataSource = self
myTableView.registerForDraggedTypes([.string])
}
func tableView(_ tableView: NSTableView, pasteboardWriterForRow row: Int) -> NSPasteboardWriting? {
let pasteboard = NSPasteboardItem()
pasteboard.setString("\(row)", forType: .string)
return pasteboard
}
func tableView(_ tableView: NSTableView, validateDrop info: NSDraggingInfo, proposedRow row: Int, proposedDropOperation dropOperation: NSTableView.DropOperation) -> NSDragOperation {
return .move
}
func tableView(_ tableView: NSTableView, acceptDrop info: NSDraggingInfo, row: Int, dropOperation: NSTableView.DropOperation) -> Bool {
var oldIndexes = [Int]()
info.enumerateDraggingItems(options: [], for: tableView, classes: [NSPasteboardItem.self], searchOptions: [:]) { dragItem, _, _ in
if let str = (dragItem.item as? NSPasteboardItem)?.string(forType: .string), let index = Int(str) {
oldIndexes.append(index)
}
}
var oldIndexOffset = 0
var newIndexOffset = 0
// For simplicity, the code below uses `tableView.moveRowAtIndex` to move rows around directly.
// You may want to move rows in your content array and then call `tableView.reloadData()` instead.
tableView.beginUpdates()
for oldIndex in oldIndexes {
if oldIndex < row {
tableView.moveRow(at: oldIndex + oldIndexOffset, to: row - 1)
oldIndexOffset -= 1
} else {
tableView.moveRow(at: oldIndex, to: row + newIndexOffset)
newIndexOffset += 1
}
}
tableView.endUpdates()
return true
}
Hope it's not too late...
I work with VisualStudio for Mac in C# and don't have Swift skills...
Can you give me a transcription in C# of this part of you'r sample?
Thank tou for helping if possible
info.enumerateDraggingItems(options: [], for: tableView, classes: [NSPasteboardItem.self], searchOptions: [:]) { dragItem, _, _ in
if let str = (dragItem.item as? NSPasteboardItem)?.string(forType: .string), let index = Int(str) {
oldIndexes.append(index)
}
}