Cannot invoke initializer for type 'NSURL' with an argument list of type '(fileURLWithPath: NSURL)'

问题

I upgraded my code for Swift 2, here I got an error:

Cannot invoke initializer for type NSURL with an argument list of type (fileURLWithPath: NSURL)

Here's the code:

    let dirPaths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
    let docsDir = dirPaths[0] 
    let soundFilePath = NSURL(fileURLWithPath: docsDir).URLByAppendingPathComponent("sound.caf")
    let soundFileURL = NSURL(fileURLWithPath: soundFilePath)
    //The error goes here.

回答1:

Syntax of fileURLWithPath:

public init(fileURLWithPath path: String)

Which means it only accept String as argument. And you are passing NSURL as an argument.

And you can solve it this way:

let dirPaths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
let docsDir = dirPaths[0]
let soundFilePath = (docsDir as NSString).stringByAppendingPathComponent("sound.caf")
let soundFileURL = NSURL(fileURLWithPath: soundFilePath)

And here is extension if you want to use:

extension String {

    func stringByAppendingPathComponent(path: String) -> String {

        return (self as NSString).stringByAppendingPathComponent(path)
    }
}

And you can use it this way:

let soundFilePath = docsDir.stringByAppendingPathComponent("sound.caf")
let soundFileURL = NSURL(fileURLWithPath: soundFilePath)

回答2:

You're trying to create an NSURL from an NSURL object, there is no initializer for that. To create the URL properly just replace

let soundFilePath = NSURL(fileURLWithPath: docsDir).URLByAppendingPathComponent("sound.caf")
let soundFileURL = NSURL(fileURLWithPath: soundFilePath)

with

let soundFileURL = NSURL(fileURLWithPath: docsDir).URLByAppendingPathComponent("sound.caf")

来源：https://stackoverflow.com/questions/32665508/cannot-invoke-initializer-for-type-nsurl-with-an-argument-list-of-type-fileu

标签

ios

swift

swift2