Swift - 如何获取文件夹中的文件路径 [英] Swift - How do I get the file path inside a folder

问题描述

我在文件夹中有一组音频文件。我可以在文件放在主捆绑包时访问该文件，但如果文件在文件夹内移动，我将无法访问这些文件。

I have a set of audio files inside a folder. I am able to access the file when the file is placed at main bundle, but if the files are moved inside the folder I am not able to access the files.

代码：

let audioFileName:String = "audioFiles/" + String(index)
let audioFile = NSBundle.mainBundle().pathForResource(audioFileName, ofType: "mp3")!

我在audioFiles文件夹中有一个音频文件，我希望得到它的路径。

I have an audio file inside the folder audioFiles and I would want to get its path.

错误：

致命错误：在解包可选值时意外发现nil

fatal error: unexpectedly found nil while unwrapping an Optional value

推荐答案

首先确保将文件夹audioFiles拖到项目中以选择创建文件夹引用，它应该显示一个蓝色文件夹。

First make sure when you drag your folder audioFiles to your project to select create folder references and it should show a blue folder.

NSBundle方法pathForResource还有一个初始化程序，您可以在其中指定文件所在的目录：

Also NSBundle method pathForResource has an initialiser that you can specify in which directory your files are located:

let audioFileName = "audioName" 

if let audioFilePath = Bundle.main.path(forResource: audioFileName, ofType: "mp3", inDirectory: "audioFiles") {
    print(audioFilePath)
}

如果您想获取该文件URL，可以使用NSBundle方法URLForResource（withExtension：，子目录:)

If you would like to get that file URL you can use NSBundle method URLForResource(withExtension:, subdirectory:)

if let audioFileURL = Bundle.main.url(forResource: audioFileName, withExtension: "mp3", subdirectory: "audioFiles") {
    print(audioFileURL)
}

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