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swiftfileswift3nsdata

Apple Swift 3.0 Data

I'm trying to use:

init(contentsOf: URL, options: Data.ReadingOptions)

in Swift 3.0 with xCode 8.0. The exact statement I am using is:

let jsonData = try Data.init(contentsOf: URL(file_path), options: .mappedIfSafe)

I have also tried:

let jsonData = try Data(contentsOf: URL(file_path), options: .mappedIfSafe)

I am following the documentation

This does not compile, complaining about incorrect argument labels in call.

I'm a Swift newbie, so please be gentle. file_path is a string obtained from an NSOpenPanel and stringified using stringValue.

Thanks!

Solution

  • Don't use string paths in conjunction with NSOpenPanel, get the url property – that avoids the extra step to create the URL – and wrap the Data initializer in a do - catch block.

    if let url = openPanel.url {
    do {
        let jsonData = try Data(contentsOf: url, options: .mappedIfSafe)
        // do things with jsonData
    } catch {
       print(error)
    }
}