ios - 从 Swift 4 的文件目录中删除用户选择的文件？

Question

您好，我有以下代码作为函数从文件目录中删除文件。但是当传递单个文件名字符串时它似乎工作了几次但是当我将它用作函数并传递文件名时，它不起作用。 代码如下。 我在 Swift 4.1 中使用 Xcode 9.2

//USAGE
//User Clicks on a delete button and that will present an Alert Dialog with a list of files and user clicks on the file he/she would like to delete
/////////////////////////////////////////////////////
@IBAction func deleteConfigAction(_ sender: Any) {
    //---
    //---

    //Another function is called to list all files in the files directory and then store it into a string variable
    var file1: String = "Empty"

    //Calling another function to load all files present
    var userFilesPresent : [String] = listFilesPresent()!

    //For Example
    file1 = userFilesPresent[0]

    //---
    let alert = UIAlertController(title: "Delete File", message: "Select a file to be deleted", preferredStyle: UIAlertControllerStyle.alert)

    alert.addAction(UIAlertAction(title: file1, style: .default,handler: { (action: UIAlertAction!) in

        self.deleteFileSelected(fileName: file1)

        print("file deleted =",file1)

    }))

    alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.cancel, handler: nil))

    // show the alert
    self.present(alert, animated: true, completion: nil)
}

//----------------------------------------------------------------
//FUNCTION

func deleteFileSelected(fileName:String) -> [String]? {
    //Set Files directory path

    let mypath = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)

    if mypath.count > 0 {

        let directoryPath = mypath[0]

        //Filter for txt files
        let searchfilePath = NSString(format:"%@/%@.txt", directoryPath, fileName) as String

        if FileManager.default.fileExists(atPath: searchfilePath) {
            do {
                //file exists, now try deleting the file
                try FileManager.default.removeItem(atPath: searchfilePath)
                print("File deleted")
            } catch {
                print("Error")
            }
        }
    }

    return nil
}

Answer 1

您需要通过将文件名附加到目录的基本 url 来创建文件路径

func delete(fileName : String)->Bool{
    let fileManager = FileManager.default
    let docDir = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
    let filePath = docDir.appendingPathComponent(fileName)
    do {
        try FileManager.default.removeItem(at: filePath)
        print("File deleted")
        return true
    }
    catch {
        print("Error")
    }
    return false
}