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
}

很简单，我使用该函数获取我的文件名。它现在正确返回，我如何使用 Swift 3 删除这个文件？ 我怎样才能像UIImageJPEGRepresentation一样读回图像？

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

我做了跟踪，但它不起作用

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

fileManager = FileManager.default var filePath = 文件名 // 检查文件是否存在

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

我这样保存文件

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

但我无法从下面提供的答案中删除它

Answer 1

删除文件有几行：

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

下面是设置它为 imageView 的代码：

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

Answer 2

试试这个。希望它会工作。要删除文件

    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)")
    }

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

对于图片加载：

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)!