Question

所以在我的Swift App中，我有一个选择文件夹/ Drive的函数 - 然后我想将NSURL用作String。然而 - 当我打印NSURL时，它出现为“可选（文件：///（东西在这里）”但是当我把它变成一个字符串时它出现为Nil。有什么我做错了吗？代码

@IBAction func selectDrive(sender: AnyObject) {
    var openPanel = NSOpenPanel()
    openPanel.allowsMultipleSelection = false
    openPanel.canChooseDirectories = true
    openPanel.canCreateDirectories = true
    openPanel.canChooseFiles = false
    openPanel.beginWithCompletionHandler { (result) -> Void in
        if result == NSFileHandlingPanelOKButton {
            println(openPanel.URL)
            self.url = openPanel.URL!

            var loc = String(contentsOfURL: self.url)
            println("Location is at \(loc)")
            // var str = String(system("diskutil info \(loc) | grep UUID:"))

        }

    }
}

我还在顶部声明了以下内容

var url = NSURL()
@IBOutlet weak var driveLabel: NSTextField!

非常感谢任何帮助。昨晚我花了几个小时尝试将控制台输出作为String返回，尝试将NSURL转换为String，尝试删除整个应用程序......

Answer 1

NSOpenPanel始终返回带有file://方案的网址，您可以使用其path属性获取字符串表示

@IBAction func selectDrive(sender: AnyObject) {
    var openPanel = NSOpenPanel()
    openPanel.allowsMultipleSelection = false
    openPanel.canChooseDirectories = true
    openPanel.canCreateDirectories = true
    openPanel.canChooseFiles = false
    openPanel.beginWithCompletionHandler { (result) -> Void in
        if result == NSFileHandlingPanelOKButton {

            self.url = openPanel.URL!
            println("Location is at \(self.url.path!)")
        }
    }
}

SWIFT：NSURL始终为零或无法使用

1 个答案: