macos - 不寻常的核心数据行为 - 保存一个对象会影响另一个对象吗？-6ren

macos - 不寻常的核心数据行为 - 保存一个对象会影响另一个对象吗？

转载作者：行者123 更新时间：2023-11-28 08:55:28

所以我正在尝试学习 Swift，我确定我做错了什么，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来帮助自己跟上这门语言的速度。它具有一个 TableView (由 NSArrayController 填充)。单击 TableView 中的注释会弹出一个显示注释标题和正文的 View Controller 。单击添加按钮创建一个新的笔记管理对象并将其传递给与用于编辑的 View Controller 相同的 View Controller 。

编辑笔记时，用户选择一些文本并按 command-l 可以创建一个标题与所选文本相同的新笔记。

除了 command-l 之外，一切都很好。这种行为非常不寻常，我敢肯定，这是我造成的。

它是这样的:

创建注释并填写标题和正文。假设它被称为“第一”，主体是“这是第一个，而不是第二个”。
选择一些文本('second')并按下 command-l。这将保存当前笔记，创建一个新的托管对象，填写标题('second')，并将其显示在 View Controller 中。输入正文('这是第二个')
保存笔记。
View Controller 现在应该列出两个注释。单击第一个音符(“第一个”)现在会显示第二个音符的描述。 ('这是第二个')

这是一些代码:

从主( TableView ) Controller :

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
    }
}

从细节 View Controller :

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
        }
    }    
}

创建第一个笔记:

按下 command-l 后，第一个音符被保存，第二个音符被创建:

保存第二个笔记(点击完成)后，返回到表格 View ，然后点击第一个:

因此，为了找出发生了什么，我为 managedObjectContext 通知添加了 KVO。我在设置了所有核心数据的 appdelegate 中执行了此操作:

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)
}

监控我的观察者生成的输出，我没有看到第一个笔记被更新和保存，以至于正文被设置为第二个!这是其中的数据。在此日志数据的最后，有一条通知说第一个注释已被修改。在哪里？!

-- 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)}";
}}

其他注意事项:我在子类 NSTextView 中观察 command-l 并重写了 keyDown 函数。

编辑:我忘记指出，如果我创建一长串音符，使用 command-l 从一个音符转到下一个音符，当我回头查看时，该音符链中的每个音符都将具有相同的音符主体他们。

最佳答案

所有的 attributedBodies 都指向同一个 textStorage。

改变

self.note?.attributedBody=noteBody.textStorage

到

self.note?.attributedBody = NSAttributedString(attributedString: noteBody.textStorage!)

关于macos - 不寻常的核心数据行为 - 保存一个对象会影响另一个对象吗？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33181372/

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