ios 如何使用 NSURL 检索本地文件？
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How can I retrieve local files with NSURL?
提问by Philip Ulrich
I'm here with a question that probably has a really simple answer that I am overlooking... how can I retrieve local files with NSURL? I have this here:
我在这里提出了一个问题，该问题可能有一个非常简单的答案，但我忽略了……如何使用 NSURL 检索本地文件？我这里有这个：
override func viewDidLoad() {
super.viewDidLoad()
var urlpath = NSBundle.mainBundle().pathForResource("bpreg", ofType: "xml")
let url:NSURL = NSURL(string: urlpath!)!
parser = NSXMLParser(contentsOfURL: url)!
parser.delegate = self
parser.parse()
}
But after it successfully builds it hangs on var urlpath. I've searched around and tried a few suggestions here and other places to no avail. Please help? :(
但是在它成功构建后，它挂在 var urlpath 上。我四处搜索并在这里和其他地方尝试了一些建议，但无济于事。请帮忙？:(
回答by Midhun MP
You are trying to load a file from your file system, not from web.
您正在尝试从您的文件系统加载文件，而不是从 Web 加载。
For creating the NSURLyou need to use fileURLWithPath:class method.
要创建NSURL您需要使用fileURLWithPath:类方法。
Change your method like:
改变你的方法，如：
Swift 2
斯威夫特 2
override func viewDidLoad()
{
super.viewDidLoad()
var urlpath = NSBundle.mainBundle().pathForResource("bpreg", ofType: "xml")
let url:NSURL = NSURL.fileURLWithPath(urlpath!)!
parser = NSXMLParser(contentsOfURL: url)!
parser.delegate = self
parser.parse()
}
Swift 3
斯威夫特 3
override func viewDidLoad()
{
super.viewDidLoad()
let urlpath = Bundle.main.path(forResource: "bpreg", ofType: "xml")
let url = NSURL.fileURL(withPath: urlpath!)
parser = XMLParser(contentsOf: url)!
parser.delegate = self
parser.parse()
}
Note:In Swift 3 you can also use the URLclass to construct the url instead of NSURLclass. So the above code for constructing url changes to:
注意：在 Swift 3 中，您还可以使用URL类来构造 url 而不是NSURL类。所以上面构造url的代码改为：
let url = URL(fileURLWithPath: urlpath!)
回答by Leo Dabus
You should use URLForResource(_:withExtension:) instead of pathForResource:
您应该使用 URLForResource(_:withExtension:) 而不是 pathForResource：
let fileUrl = Bundle.main.url(forResource: "bpreg", withExtension: "xml")
回答by Christian
Your file doesn't exist in your main-bundle yet.
您的主包中尚不存在您的文件。
You have to add the file your are using to your Bundle Resource.
您必须将您正在使用的文件添加到您的捆绑资源中。
So to add it. Go to App Target -> Build Phasesand check the Bundle Resourceand add it by drag n' drop.
所以要添加它。转到App Target -> Build Phases并检查Bundle Resource并通过拖放添加它。
