删除文件有几行：

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

下面是将其设置为imageView的代码：

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

试试这个，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：Delete File Example in Swift

镜像加载：

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)!

您可以将删除代码放在DispatchQeue.main.async中，如下所示：

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