在ios中使用swift删除文件

Question

func getDocumentsDirectory() -> URL {
    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    let documentsDirectory = paths[0]
    return documentsDirectory
}

So simply, I get my filename using that function.And it returns correctly for now, how can I delete this file using Swift 3? And How can I read the image back like UIImageJPEGRepresentation ?

let image_data = UIImageJPEGRepresentation(self.commons.correctlyOrientedImage(image: self.imageSelected.image!),0.5)

I did following and its not working

let filename = getDocumentsDirectory().appendingPathComponent("l.png") let

fileManager = FileManager.default var filePath = filename // Check if file exists

 if fileManager.fileExists(atPath: filePath.absoluteString) { // Delete file try fileManager.removeItem(atPath: filePath.absoluteString) } else { print("File does not exist") }

I save the file like this

let filename = getDocumentsDirectory().appendingPathComponent("COPY111.PNG") try? image_data?.write(to: filename)

But I cannot remove it from answers provided below

Answer 1

There're lines for deleting a file:

do {
    try FileManager.default.removeItem(at: fileName)
} catch let error as NSError {
    print("Error: \(error.domain)")
}

And here's code for setting it to imageView:

if let image = UIImage(contentsOfFile: fileName) {
   imageView.image = image
}

Answer 2

Try this. Hope it will work.To delete a file

    let fileNameToDelete = "myFileName.txt"
    var filePath = ""

    // Fine documents directory on device
    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
    let documentDirectory = paths[0]
    filePath = documentDirectory.appendingFormat("/" + fileNameToDelete)

    do {
        let fileManager = FileManager.default

        // Check if file exists
        if fileManager.fileExists(atPath: filePath) {
            // Delete file
            try fileManager.removeItem(atPath: filePath)
        } else {
            print("File does not exist")
        }

    }
    catch let error as NSError {
        print("An error took place: \(error)")
    }

Source : http://swiftdeveloperblog.com/code-examples/delete-file-example-in-swift/

For image loading :

let imageData = UIImageJPEGRepresentation(image)!  
let docDir = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)  
let imageURL = docDir.appendingPathComponent("tmp.jpeg")  
try! imageData.write(to: imageURL)  

let newImage = UIImage(contentsOfFile: imageURL.path)! 

Answer 3

you could put your remove code in DispatchQeue.main.async like this:

if fileManager.fileExists(atPath: filePath.absoluteString) {
      // Delete file
      DispatchQueue.main.async {
            try fileManager.removeItem(atPath: filePath.absoluteString)
        }
                
            } else {
                print("File does not exist")
            }