将PathForResource转换为返回nil Swift的字符串 [英] Converting PathForResource To String Returning nil Swift

问题描述

在Mac应用程序中加载本地资源文件时

When loading a local resource file in a mac app

let urlpath = NSBundle.mainBundle().pathForResource("myResource", ofType: "html");

将资源路径转换为NSURL的string总是返回nil

Converting the resource path to a string for NSURL always returns nil

    println("resource path = \(urlpath)") <---resource logged ok

    web.frameLoadDelegate = self;
    let requesturl = NSURL(string: urlpath!)

   println("URL String  = \(requesturl)"),<---- returns nil

    let request = NSURLRequest(URL: requesturl!)
    web.mainFrame.loadRequest(request)

大概是为什么我收到错误found nil while unwrapping an Optional value的原因 我在这里想将pathForResource正确转换为string的什么?

Which presumably is why im getting the error found nil while unwrapping an Optional value What am I missing here to correctly convert the pathForResource to a string?

推荐答案

莱昂纳多答案中给出的代码应该有效，并且更容易，更安全. 可选绑定的方法.这是为什么您的解释 代码失败:

The code given in Leonardo's answer should work and is the easier and safer method with optional binding. Here is an explanation why your code fails:

let requesturl = NSURL(string: urlpath!)

返回nil，因为urlpath是文件路径，而不是 URL字符串 (例如"file:///path/to/file").

returns nil because urlpath is a file path and not an URL string (such as "file:///path/to/file").

如果将该行替换为

let requesturl = NSURL(fileURLWithPath: urlpath!)

然后您将获得预期的输出.

then you will get the expected output.

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