Question

所以我正在努力学习Swift，我确信我做错了什么，但我无法弄清楚那可能是什么。

我正在编写一个笔记应用程序，以帮助自己熟悉该语言。它具有表视图（由NSArrayController填充）。单击表视图中的注释会弹出一个视图控制器，显示注释的标题和正文。单击“添加”按钮可创建新的笔记管理对象，并将其传递给与用于编辑的视图控制器相同的视图控制器。

编辑注释时，选择某些文本并按下命令-l的用户可以创建一个标题等于所选文本的新注释。

除命令-l外，一切都很好。这种行为是最不寻常的，我敢肯定，这是我造成的。

它是这样的：

创建一个注释并填写标题和正文。让我们说它被称为'第一'，身体是'这是第一个，而不是第二个。'
选择一些文本（'second'）并按下命令-l。这将保存当前注释，创建新的托管对象，填写标题（“秒”），并在视图控制器中显示。输入正文（'这是第二个'）
保存说明。
视图控制器现在列出了两个音符。单击第一个音符（'first'）现在显示第二个音符的说明。（'这是第二个'）

以下是一些代码：

从主（表视图）控制器：

override func prepareForSegue(segue: NSStoryboardSegue, sender: AnyObject?) {
    if segue.identifier=="CreateNote" {
        let nextViewController = segue.destinationController as! DetailViewController
        nextViewController.managedContext=self.managedContext
        nextViewController.note = NSEntityDescription.insertNewObjectForEntityForName("Note", inManagedObjectContext: managedContext!) as! Note
    }
    else if segue.identifier=="EditNote" {
        let theSelection = tableView.selectedRow
        let theNote = noteArrayController?.arrangedObjects[theSelection] as! Note
        let nextViewController = segue.destinationController as! DetailViewController
        nextViewController.managedContext=self.managedContext
        nextViewController.note = theNote
    }
}

从详细视图控制器：

import AppKit

class DetailViewController: NSViewController, KeyNotificationProtocol {

    @IBOutlet weak var noteTitle: NSTextField!
    @IBOutlet var noteBody: TWTextView!

    @IBAction func backButton(sender: AnyObject) {
        saveNote()
        if historyStack.isNotEmpty() {
            note=findNoteByName(historyStack.pop())
            loadNote()
        }
    }

    @IBAction func dismissButton(sender: AnyObject) {
        saveNote()
        self.dismissController(self)
    }
    var managedContext: NSManagedObjectContext?
    var note: Note?
    var noteNameToLoad: String?
    var historyStack = Stack<String>()

    override func viewDidLoad() {
        super.viewDidLoad()
        loadNote()
        noteBody.keyDelegate = self

        var requestArray: [KeyRequest] = []

        requestArray.append(KeyRequest(theFlags: [NSEventModifierFlags.CommandKeyMask],
            theKey: "l",
            theTag: "link",
            theFunc: self.createLink))

        noteBody.keysOfInterest=requestArray
    }

    override func viewWillDisappear() {
        saveNote()
    }

    func keypressWasReceived(keypress: KeyNotificationData) {
        keypress.keypressRequest.funcToCall()
    }

    func createLink() {
        print("create link!")
        if(noteBody.selectedRange().length>0) {
            saveNote()
            if let swRange = noteBody.string?.rangeFromNSRange(noteBody.selectedRange()) {
                let selectedText = noteBody.string!.substringWithRange(swRange)
                let tempNote=findNoteByName(selectedText)
                if(tempNote==nil) {
                    historyStack.push((note?.title)!)
                    self.note = (NSEntityDescription.insertNewObjectForEntityForName("Note", inManagedObjectContext: managedContext!) as! Note)
                    self.note!.title=selectedText
                    self.note!.attributedBody=NSAttributedString(string: "New note")
                    loadNote()
                }
                else {
                    print("note exists")
                }
            }

        }
    }

    func saveNote() -> BooleanType {
        if (managedContext?.hasChanges != nil) {
            self.note?.title=noteTitle.stringValue
            self.note?.attributedBody=noteBody.textStorage
            var saved = false

            do {
                try managedContext?.save()
                saved = true
            }
            catch let error as NSError {
                print("Error saving \(error)", terminator: "")
            }

            return saved
        }
        else {
            return true
        }

    }

    func loadNote() {
        if self.note?.title==nil {
            self.note?.title=""
        }
        noteTitle.stringValue = (self.note?.title)!

        if(self.note?.attributedBody?.length>0) {
            noteBody.textStorage?.setAttributedString((self.note?.attributedBody)!)
        }
        else if(self.note?.body?.characters.count>0) {
            noteBody.textStorage?.setAttributedString(NSAttributedString(string: (self.note?.body)!))
        }
        else {
            noteBody.textStorage?.setAttributedString(NSAttributedString(string: ""))
        }

    }

    func findNoteByName(noteName: String) -> Note? {
        let freq = NSFetchRequest(entityName: "Note")
        freq.predicate = NSPredicate(format: "title == %@", noteName)
        var result: [Note]=[]
        do {
            result = try managedContext?.executeFetchRequest(freq) as! [Note]
        }
        catch let theError as NSError {
            print(theError)
            result=[]
        }

        if result.count>0 {
            return result[0]
        }
        else {
            return nil
        }
    }    
}

创建第一个音符：

按下command-l后，将保存第一个音符并创建第二个音符：

保存第二个音符（单击完成后），返回到表格视图，然后单击第一个音符：

因此，为了找出问题所在，我为managedObjectContext通知添加了KVO。我在appdelegate中完成了所有核心数据设置：

func applicationDidFinishLaunching(aNotification: NSNotification) {
    // Insert code here to initialize your application

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "shitHappened:", name: NSManagedObjectContextObjectsDidChangeNotification, object: managedObjectContext)

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "shitHappened:", name: NSManagedObjectContextDidSaveNotification, object: managedObjectContext)

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "shitHappened:", name: NSManagedObjectContextWillSaveNotification, object: managedObjectContext)
}

func shitHappened(sender: AnyObject) {
    print("-- something happened with core data --")
    print(sender)
}

监视观察者生成的输出，我看不到正在更新的第一个音符＆amp;保存，使身体设置为第二个！这是来自那里的数据。在此日志数据的最后，有一条通知说First Note已被修改。哪里？！

-- something happened with core data --
NSConcreteNotification 0x608000045c10 {name = NSObjectsChangedInManagingContextNotification; object = <NSManagedObjectContext: 0x6180001c01e0>; userInfo = {
    inserted = "{(\n    <testwiki.Note: 0x6100000a8fa0> (entity: Note; id: 0x610000020b40 <x-coredata:///Note/tBCC61422-BDB8-44EB-A1A0-D32126C892354> ; data: {\n    attributedBody = nil;\n    body = nil;\n    title = \"\";\n})\n)}";
    managedObjectContext = "<NSManagedObjectContext: 0x6180001c01e0>";
}}
create link!
-- something happened with core data --
NSConcreteNotification 0x61000005af40 {name = NSObjectsChangedInManagingContextNotification; object = <NSManagedObjectContext: 0x6180001c01e0>; userInfo = {
    managedObjectContext = "<NSManagedObjectContext: 0x6180001c01e0>";
    updated = "{(\n    <testwiki.Note: 0x6100000a8fa0> (entity: Note; id: 0x610000020b40 <x-coredata:///Note/tBCC61422-BDB8-44EB-A1A0-D32126C892354> ; data: {\n    attributedBody = \"This is the first, not the second.{\\n    NSFont = \\\"\\\\\\\"Helvetica 12.00 pt. P [] (0x610000247e90) fobj=0x101b11ca0, spc=3.33\\\\\\\"\\\";\\n    NSParagraphStyle = \\\"Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\\\\n    28L,\\\\n    56L,\\\\n    84L,\\\\n    112L,\\\\n    140L,\\\\n    168L,\\\\n    196L,\\\\n    224L,\\\\n    252L,\\\\n    280L,\\\\n    308L,\\\\n    336L\\\\n), DefaultTabInterval 0, Blocks (\\\\n), Lists (\\\\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation YES, HeaderLevel 0\\\";\\n}\";\n    body = nil;\n    title = \"The First Note\";\n})\n)}";
}}
-- something happened with core data --
NSConcreteNotification 0x61000004dc50 {name = NSManagingContextWillSaveChangesNotification; object = <NSManagedObjectContext: 0x6180001c01e0>}
-- something happened with core data --
NSConcreteNotification 0x61000024c870 {name = NSManagingContextDidSaveChangesNotification; object = <NSManagedObjectContext: 0x6180001c01e0>; userInfo = {
    inserted = "{(\n    <testwiki.Note: 0x6100000a8fa0> (entity: Note; id: 0x610000228e00 <x-coredata://18C6EA07-F369-4289-B333-53326C2B9DFE/Note/p226> ; data: {\n    attributedBody = \"This is the first, not the second.{\\n    NSFont = \\\"\\\\\\\"Helvetica 12.00 pt. P [] (0x610000247e90) fobj=0x101b11ca0, spc=3.33\\\\\\\"\\\";\\n    NSParagraphStyle = \\\"Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\\\\n    28L,\\\\n    56L,\\\\n    84L,\\\\n    112L,\\\\n    140L,\\\\n    168L,\\\\n    196L,\\\\n    224L,\\\\n    252L,\\\\n    280L,\\\\n    308L,\\\\n    336L\\\\n), DefaultTabInterval 0, Blocks (\\\\n), Lists (\\\\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation YES, HeaderLevel 0\\\";\\n}\";\n    body = nil;\n    title = \"The First Note\";\n})\n)}";
    updated = "{(\n)}";
}}
loadNote
Optional("second")
Optional(New note{
})
-- something happened with core data --
NSConcreteNotification 0x610000053a10 {name = NSObjectsChangedInManagingContextNotification; object = <NSManagedObjectContext: 0x6180001c01e0>; userInfo = {
    inserted = "{(\n    <testwiki.Note: 0x6100000a9a80> (entity: Note; id: 0x6100002298c0 <x-coredata:///Note/tBCC61422-BDB8-44EB-A1A0-D32126C892355> ; data: {\n    attributedBody = \"New note{\\n}\";\n    body = nil;\n    title = second;\n})\n)}";
    managedObjectContext = "<NSManagedObjectContext: 0x6180001c01e0>";
}}
-- something happened with core data --
NSConcreteNotification 0x61800005cbc0 {name = NSObjectsChangedInManagingContextNotification; object = <NSManagedObjectContext: 0x6180001c01e0>; userInfo = {
    managedObjectContext = "<NSManagedObjectContext: 0x6180001c01e0>";
    updated = "{(\n    <testwiki.Note: 0x6100000a9a80> (entity: Note; id: 0x6100002298c0 <x-coredata:///Note/tBCC61422-BDB8-44EB-A1A0-D32126C892355> ; data: {\n    attributedBody = \"This is the second.{\\n    NSFont = \\\"\\\\\\\"Helvetica 12.00 pt. P [] (0x610000247e90) fobj=0x101b11ca0, spc=3.33\\\\\\\"\\\";\\n    NSParagraphStyle = \\\"Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\\\\n    28L,\\\\n    56L,\\\\n    84L,\\\\n    112L,\\\\n    140L,\\\\n    168L,\\\\n    196L,\\\\n    224L,\\\\n    252L,\\\\n    280L,\\\\n    308L,\\\\n    336L\\\\n), DefaultTabInterval 0, Blocks (\\\\n), Lists (\\\\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation YES, HeaderLevel 0\\\";\\n}\";\n    body = nil;\n    title = second;\n})\n)}";
}}
-- something happened with core data --
NSConcreteNotification 0x618000240d50 {name = NSManagingContextWillSaveChangesNotification; object = <NSManagedObjectContext: 0x6180001c01e0>}
-- something happened with core data --
NSConcreteNotification 0x61800005d970 {name = NSManagingContextDidSaveChangesNotification; object = <NSManagedObjectContext: 0x6180001c01e0>; userInfo = {
    inserted = "{(\n    <testwiki.Note: 0x6100000a9a80> (entity: Note; id: 0x61800003ac20 <x-coredata://18C6EA07-F369-4289-B333-53326C2B9DFE/Note/p227> ; data: {\n    attributedBody = \"This is the second.{\\n    NSFont = \\\"\\\\\\\"Helvetica 12.00 pt. P [] (0x610000247e90) fobj=0x101b11ca0, spc=3.33\\\\\\\"\\\";\\n    NSParagraphStyle = \\\"Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\\\\n    28L,\\\\n    56L,\\\\n    84L,\\\\n    112L,\\\\n    140L,\\\\n    168L,\\\\n    196L,\\\\n    224L,\\\\n    252L,\\\\n    280L,\\\\n    308L,\\\\n    336L\\\\n), DefaultTabInterval 0, Blocks (\\\\n), Lists (\\\\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation YES, HeaderLevel 0\\\";\\n}\";\n    body = nil;\n    title = second;\n})\n)}";
    updated = "{(\n)}";
}}
-- something happened with core data --
NSConcreteNotification 0x618000242310 {name = NSObjectsChangedInManagingContextNotification; object = <NSManagedObjectContext: 0x6180001c01e0>; userInfo = {
    managedObjectContext = "<NSManagedObjectContext: 0x6180001c01e0>";
    updated = "{(\n    <testwiki.Note: 0x6100000a9a80> (entity: Note; id: 0x61800003ac20 <x-coredata://18C6EA07-F369-4289-B333-53326C2B9DFE/Note/p227> ; data: {\n    attributedBody = \"This is the second.{\\n    NSFont = \\\"\\\\\\\"Helvetica 12.00 pt. P [] (0x610000247e90) fobj=0x101b11ca0, spc=3.33\\\\\\\"\\\";\\n    NSParagraphStyle = \\\"Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\\\\n    28L,\\\\n    56L,\\\\n    84L,\\\\n    112L,\\\\n    140L,\\\\n    168L,\\\\n    196L,\\\\n    224L,\\\\n    252L,\\\\n    280L,\\\\n    308L,\\\\n    336L\\\\n), DefaultTabInterval 0, Blocks (\\\\n), Lists (\\\\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation YES, HeaderLevel 0\\\";\\n}\";\n    body = nil;\n    title = second;\n})\n)}";
}}
-- something happened with core data --
NSConcreteNotification 0x618000242f40 {name = NSManagingContextWillSaveChangesNotification; object = <NSManagedObjectContext: 0x6180001c01e0>}
-- something happened with core data --
NSConcreteNotification 0x608000046240 {name = NSManagingContextDidSaveChangesNotification; object = <NSManagedObjectContext: 0x6180001c01e0>; userInfo = {
    inserted = "{(\n)}";
    updated = "{(\n    <testwiki.Note: 0x6100000a9a80> (entity: Note; id: 0x61800003ac20 <x-coredata://18C6EA07-F369-4289-B333-53326C2B9DFE/Note/p227> ; data: {\n    attributedBody = \"This is the second.{\\n    NSFont = \\\"\\\\\\\"Helvetica 12.00 pt. P [] (0x610000247e90) fobj=0x101b11ca0, spc=3.33\\\\\\\"\\\";\\n    NSParagraphStyle = \\\"Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\\\\n    28L,\\\\n    56L,\\\\n    84L,\\\\n    112L,\\\\n    140L,\\\\n    168L,\\\\n    196L,\\\\n    224L,\\\\n    252L,\\\\n    280L,\\\\n    308L,\\\\n    336L\\\\n), DefaultTabInterval 0, Blocks (\\\\n), Lists (\\\\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation YES, HeaderLevel 0\\\";\\n}\";\n    body = nil;\n    title = second;\n})\n)}";
}}
about to segue to editNote
with title
Optional("The First Note")
Optional(This is the second.{
    NSFont = "\"Helvetica 12.00 pt. P [] (0x610000247e90) fobj=0x101b11ca0, spc=3.33\"";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation YES, HeaderLevel 0";
})
------------------------
loadNote
Optional("The First Note")
Optional(This is the second.{
    NSFont = "\"Helvetica 12.00 pt. P [] (0x610000247e90) fobj=0x101b11ca0, spc=3.33\"";
    NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    28L,\n    56L,\n    84L,\n    112L,\n    140L,\n    168L,\n    196L,\n    224L,\n    252L,\n    280L,\n    308L,\n    336L\n), DefaultTabInterval 0, Blocks (\n), Lists (\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation YES, HeaderLevel 0";
})
-- something happened with core data --
NSConcreteNotification 0x618000241aa0 {name = NSObjectsChangedInManagingContextNotification; object = <NSManagedObjectContext: 0x6180001c01e0>; userInfo = {
    managedObjectContext = "<NSManagedObjectContext: 0x6180001c01e0>";
    updated = "{(\n    <testwiki.Note: 0x6100000a8fa0> (entity: Note; id: 0x610000228e00 <x-coredata://18C6EA07-F369-4289-B333-53326C2B9DFE/Note/p226> ; data: {\n    attributedBody = \"This is the second.{\\n    NSFont = \\\"\\\\\\\"Helvetica 12.00 pt. P [] (0x610000247e90) fobj=0x101b11ca0, spc=3.33\\\\\\\"\\\";\\n    NSParagraphStyle = \\\"Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\\\\n    28L,\\\\n    56L,\\\\n    84L,\\\\n    112L,\\\\n    140L,\\\\n    168L,\\\\n    196L,\\\\n    224L,\\\\n    252L,\\\\n    280L,\\\\n    308L,\\\\n    336L\\\\n), DefaultTabInterval 0, Blocks (\\\\n), Lists (\\\\n), BaseWritingDirection -1, HyphenationFactor 0, TighteningForTruncation YES, HeaderLevel 0\\\";\\n}\";\n    body = nil;\n    title = \"The First Note\";\n})\n)}";
}}

其他说明：我正在使用重写的keyDown函数在子类NSTextView中查看命令-l。

编辑：我忽略了指出如果我创建了一长串音符，使用命令-l从一个音符到另一个音符，当我回去看看时，该链中的每个音符都会有相同的音符。它们。

Answer 1

所有attributesBodies指向相同的textStorage。

更改

Toolbar

到

self.note?.attributedBody=noteBody.textStorage

不寻常的核心数据行为 - 保存另一个对象效果吗？

1 个答案: