xcode Swift - pathForResource inDirectory 参数
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Swift - pathForResource inDirectory parameter
提问by user2397282
I'm making a very simple app that uses a UIWebView to display a pdf map that can be zoomed in on, panned, etc.
我正在制作一个非常简单的应用程序，它使用 UIWebView 来显示可以放大、平移等的 pdf 地图。
However, when creating a target url for the pdf, the pathForResource call isn't working right. This is my code:
但是，在为 pdf 创建目标 url 时，pathForResource 调用无法正常工作。这是我的代码：
var targetURL : NSURL = NSBundle.mainBundle().pathForResource(filename, ofType: type)
I get an error on the parentheses before "filename", that says Missing argument for parameter 'inDirectory' in call. I tried adding an argument for this:
我在“文件名”之前的括号中收到一个错误，即Missing argument for parameter 'inDirectory' in call. 我尝试为此添加一个论点：
var targetURL : NSURL = NSBundle.mainBundle().pathForResource(filename, ofType: type, inDirectory: "Map")
I don't know what to put for inDirectory, because I don't know what the directory is - I added the file to my project and it is in the same folder as my ViewController.swift file. Anyway, it doens't really matter, because I get the following error in the same place, Extra argument 'inDirectory in call.
我不知道该放什么inDirectory，因为我不知道目录是什么 - 我将该文件添加到我的项目中，它与我的 ViewController.swift 文件位于同一文件夹中。无论如何，这并不重要，因为我在同一个地方收到以下错误，Extra argument 'inDirectory in call.
What do I do?
我该怎么办？
回答by Simon
pathForResource()does not return a NSURLobject, but a String?. Declare your variable accordingly and it should work.
pathForResource()不返回一个NSURL对象，而是一个String?. 相应地声明您的变量，它应该可以工作。
var targetURL : String? = NSBundle.mainBundle().pathForResource(filename, ofType: type)
Or, of course, if you would rather - just use URLForResource()instead.
或者，当然，如果您愿意 - 只需使用URLForResource()。
var targetURL : NSURL? = NSBundle.mainBundle().URLForResource(filename, withExtension: type)
回答by Walter
I was having this same problem. In my case it was because my variable (in your case type) needed to be unwrapped. Adding a bang !made the error go away and made the code execute.
我遇到了同样的问题。就我而言，这是因为我的变量（在您的情况下type）需要解包。添加 bang!使错误消失并使代码执行。
