如何向基于文档的 Swift 3 应用程序添加简单的保存加载功能?
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【中文标题】如何向基于文档的 Swift 3 应用程序添加简单的保存加载功能?【英文标题】:How to add simple save-load functions to document-based Swift 3 app? 【发布时间】:2017-02-13 09:01:36 【问题描述】:我目前正在研究 Swift(只是出于爱好),并试图弄清楚我应该如何在基于文档的 swift 应用程序中将函数保存和加载到 document.swift 文件中?我想知道如何保存和加载简单的 txt 文件。我正在使用 NSTextView,所以我想我必须将其更改为 NSString?
目前这些功能如下:
override func data(ofType typeName: String) throws -> Data
// Insert code here to write your document to data of the specified type. If outError != nil, ensure that you create and set an appropriate error when returning nil.
// You can also choose to override fileWrapperOfType:error:, writeToURL:ofType:error:, or writeToURL:ofType:forSaveOperation:originalContentsURL:error: instead.
throw NSError(domain: NSOSStatusErrorDomain, code: unimpErr, userInfo: nil)
override func read(from data: Data, ofType typeName: String) throws
// Insert code here to read your document from the given data of the specified type. If outError != nil, ensure that you create and set an appropriate error when returning false.
// You can also choose to override readFromFileWrapper:ofType:error: or readFromURL:ofType:error: instead.
// If you override either of these, you should also override -isEntireFileLoaded to return false if the contents are lazily loaded.
throw NSError(domain: NSOSStatusErrorDomain, code: unimpErr, userInfo: nil)
【问题讨论】:
【参考方案1】:在您的 document.swift 文件中,以下这些函数将加载并设置您的文本视图字符串值。
希望这会有所帮助!
var content = ""
override func makeWindowControllers()
//Make the window controller
let storyboard = NSStoryboard(name: "Main", bundle: nil)
let windowController = storyboard.instantiateController(withIdentifier: "Document Window Controller") as! NSWindowController
self.addWindowController(windowController)
//Access the view controller
let vc = windowController.contentViewController as! ViewController
//Set the text view string to the variable that was loaded
vc.textView.string = content
override func data(ofType typeName: String) throws -> Data
//Access the current view controller
if let vc = self.windowControllers[0].contentViewController as? ViewController
//Get the textView's String Value; or call a function that will create a string of what needs to be saved
return vc.textView.string?.data(using: String.Encoding.utf8) ?? Data()
else
throw NSError(domain: NSOSStatusErrorDomain, code: unimpErr, userInfo: nil)
override func read(from url: URL, ofType typeName: String) throws
do
//Set a string variable to the loaded string
//We can't directly set the text views string value because this function is called before the makeWindowControllers() so now text view is created yet.
content = try String(contentsOf: url, encoding: String.Encoding.utf8)
catch
throw NSError(domain: NSOSStatusErrorDomain, code: unimpErr, userInfo: nil)
【讨论】:
谢谢!如果我有任何问题,我会参与其中并报告。以上是关于如何向基于文档的 Swift 3 应用程序添加简单的保存加载功能?的主要内容,如果未能解决你的问题,请参考以下文章
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