【发布时间】：2017-11-13 06:10:48
【问题描述】：
我使用 swift 3 for osx，我正在寻找不同视图控制器中两个 NSTableView 之间的拖放解决方案。
我有一个简单的解决方案，每个表格视图只有一列，没有自定义单元格视图和字符串值。
SourceTableView
import Cocoa
class SourceTableView: NSViewController, NSTableViewDelegate, NSTableViewDataSource {
@IBOutlet weak var leftTableView: NSTableView!
var dataArray: NSMutableArray = ["Item 1","Item 2","Item 3"]
let pbStringType = "NSPasteBoardStringType"
let pbIndexType = "NSPasteBoardIndexType"
func numberOfRows(in tableView: NSTableView) -> Int {
return dataArray.count
}
func tableView(_ tableView: NSTableView, objectValueFor tableColumn: NSTableColumn?, row: Int) -> Any? {
return dataArray[row]
}
func tableView(_ tableView: NSTableView, writeRowsWith rowIndexes: IndexSet, to pboard: NSPasteboard) -> Bool {
let data = (dataArray as NSArray).objects(at:rowIndexes as IndexSet)
pboard.declareTypes([pbStringType, pbIndexType], owner: nil)
pboard.setData(NSKeyedArchiver.archivedData(withRootObject: data), forType: pbStringType)
pboard.setData(NSKeyedArchiver.archivedData(withRootObject: rowIndexes), forType: pbIndexType)
return true
}
}
目标表视图
import Cocoa
class TargetVC2: NSViewController, NSTableViewDelegate, NSTableViewDataSource {
@IBOutlet weak var rightTableView: NSTableView!
var dataArray: NSMutableArray = ["Item 5", "Item 6", "Item 7"]
let pbStringType = "NSPasteBoardStringType"
let pbIndexType = "NSPasteBoardIndexType"
override func viewDidLoad() {
super.viewDidLoad()
rightTableView.register(forDraggedTypes: [pbStringType])
}
func numberOfRows(in tableView: NSTableView) -> Int {
return dataArray.count
}
func tableView(_ tableView: NSTableView, objectValueFor tableColumn: NSTableColumn?, row: Int) -> Any? {
return dataArray[row]
}
func tableView(_ tableView: NSTableView, writeRowsWith rowIndexes: IndexSet, to pboard: NSPasteboard) -> Bool {
let data = dataArray.objects(at:rowIndexes as IndexSet)
pboard.declareTypes([pbStringType, pbIndexType], owner: nil)
pboard.setData(NSKeyedArchiver.archivedData(withRootObject: data), forType: pbStringType)
pboard.setData(NSKeyedArchiver.archivedData(withRootObject: rowIndexes), forType: pbIndexType)
return true
}
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 dropRow = row
if info.draggingSource() as! NSTableView == rightTableView && tableView == rightTableView && dropOperation == .above {
let data = info.draggingPasteboard().data(forType: pbIndexType)!
let rowIndexes = NSKeyedUnarchiver.unarchiveObject(with: data) as! NSIndexSet
dataArray.removeObjects(at: rowIndexes as IndexSet)
dropRow -= rowIndexes.countOfIndexes(in: NSMakeRange(0, dropRow))
}
let data = info.draggingPasteboard().data(forType: pbStringType)!
let draggedStrings = NSKeyedUnarchiver.unarchiveObject(with: data) as! [Any]
dataArray.insert(draggedStrings, at:IndexSet(integersIn:dropRow..<(dropRow + draggedStrings.count)))
rightTableView.reloadData()
return true
}
}
但现在我需要针对以下情况的解决方案：
- SourceTableView > 一列 > 自定义单元格视图 > 每个单元格的值：firstName、secondName
- TargetTableView > 三列 > 自定义单元格视图 > 每个单元格的值：firstName、secondName、Age
我通过核心数据获得的价值：
func requestValues() {
var values= [Person]()
let appdelegate = NSApplication.shared().delegate as! AppDelegate
let context = appdelegate.persistentContainer.viewContext
let request = NSFetchRequest<Person>(entityName: "Person")
do {
values = try context.fetch(request)
SourceTableView.reloadData()
} catch { }
}
但我上面的解决方案不适用于我的新“愿望场景”
更新 例如：我这样修改了我的 SourceTabelView：
import Cocoa
struct structData {
var firstname:String
var secondname:String
}
class SourceVC: NSViewController, NSTableViewDelegate, NSTableViewDataSource {
@IBOutlet weak var leftTableView: NSTableView!
var people = [structData]()
let pbStringType = "NSPasteBoardStringType"
let pbIndexType = "NSPasteBoardIndexType"
override func viewDidLoad() {
people.append(structData(firstname:"Max",secondname:"Mustermann"))
}
func numberOfRows(in tableView: NSTableView) -> Int {
return people.count
}
func tableView(_ tableView: NSTableView, objectValueFor tableColumn: NSTableColumn?, row: Int) -> Any? {
return people[row].firstname
}
func tableView(_ tableView: NSTableView, writeRowsWith rowIndexes: IndexSet, to pboard: NSPasteboard) -> Bool {
let data = (people as NSArray).objects(at:rowIndexes as IndexSet)
pboard.declareTypes([pbStringType, pbIndexType], owner: nil)
pboard.setData(NSKeyedArchiver.archivedData(withRootObject: data), forType: pbStringType)
pboard.setData(NSKeyedArchiver.archivedData(withRootObject: rowIndexes), forType: pbIndexType)
return true
}
}
它工作正常，但如果我拖动值为“Max”的行 => 我的应用程序会因以下错误而崩溃：
2017-06-12 07:51:09.096744+0200 TableView-DragDrop[10315:1489730] -[_SwiftValue encodeWithCoder:]: unrecognized selector sent to instance 0x6080000910d0
2017-06-12 07:51:09.100198+0200 TableView-DragDrop[10315:1489730] [General] -[_SwiftValue encodeWithCoder:]: unrecognized selector sent to instance 0x6080000910d0
2017-06-12 07:51:09.129238+0200 TableView-DragDrop[10315:1489730] [General] (
0 CoreFoundation 0x00007fffaf4d657b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x00007fffc489a1da objc_exception_throw + 48
2 CoreFoundation 0x00007fffaf556f14 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x00007fffaf449c93 ___forwarding___ + 1059
4 CoreFoundation 0x00007fffaf4497e8 _CF_forwarding_prep_0 + 120
5 Foundation 0x00007fffb0ed695a _encodeObject + 1241
6 Foundation 0x00007fffb0ed7f0c -[NSKeyedArchiver _encodeArrayOfObjects:forKey:] + 460
7 Foundation 0x00007fffb0ed695a _encodeObject + 1241
8 Foundation 0x00007fffb0f12492 +[NSKeyedArchiver archivedDataWithRootObject:] + 156
9 TableView-DragDrop 0x00000001000029a3 _TFC18TableView_DragDrop8SourceVC9tableViewfTCSo11NSTableView13writeRowsWithV10Foundation8IndexSet2toCSo12NSPasteboard_Sb + 915
10 TableView-DragDrop 0x0000000100002e5c _TToFC18TableView_DragDrop8SourceVC9tableViewfTCSo11NSTableView13writeRowsWithV10Foundation8IndexSet2toCSo12NSPasteboard_Sb + 108
11 AppKit 0x00007fffad6fc109 -[NSTableView _sendDataSourceWriteDragDataWithIndexes:toPasteboard:] + 102
12 AppKit 0x00007fffad6fcd06 -[NSTableView _performClassicDragOfIndexes:hitRow:event:] + 180
13 AppKit 0x00007fffad21e7b5 -[NSTableView _performDragFromMouseDown:] + 468
14 AppKit 0x00007fffad21cadf -[NSTableView mouseDown:] + 735
15 AppKit 0x00007fffad84024f -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 6341
16 AppKit 0x00007fffad83ca6c -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 1942
17 AppKit 0x00007fffad83bf0a -[NSWindow(NSEventRouting) sendEvent:] + 541
18 AppKit 0x00007fffad6c0681 -[NSApplication(NSEvent) sendEvent:] + 1145
19 AppKit 0x00007fffacf3b427 -[NSApplication run] + 1002
20 AppKit 0x00007fffacf05e0e NSApplicationMain + 1237
21 TableView-DragDrop 0x000000010000444d main + 13
22 libdyld.dylib 0x00007fffc517b235 start + 1
23 ??? 0x0000000000000003 0x0 + 3
)
2017-06-12 07:51:09.148230+0200 TableView-DragDrop[10315:1489730] *** -[NSKeyedArchiver dealloc]: warning: NSKeyedArchiver deallocated without having had -finishEncoding called on it.
【问题讨论】：
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嘿。以下答案是否解决了问题？如果是，请接受它作为答案。
标签： ios cocoa swift3 drag-and-drop tableview