Write in Swift

To write a file in Swift, you can use the FileManager class which provides methods to create, write, and delete files and directories.

Here's an example of creating a file and writing to it in Swift:

let fileName = "example.txt"
let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let fileURL = documentDirectory.appendingPathComponent(fileName)
do {

    let text = "Hello, world!"

    try text.write(to: fileURL, atomically: false, encoding: .utf8)

} catch {

    print("Error writing to file: \(error.localizedDescription)")

}

In this example, we first define the name of the file we want to create (example.txt) and then get the path to the document directory of the app using the urls(for:in:) method of the FileManager class.

Next, we create a fileURL by appending the file name to the document directory path using the appendingPathComponent(_:) method.

Finally, we write the text "Hello, world!" to the file using the write(to:atomically:encoding:) method. The atomically parameter specifies whether to write to the file atomically (true) or non-atomically (false), while the encoding parameter specifies the encoding to use (utf8 in this case).

If the write operation is successful, the text will be written to the file at the specified fileURL. If there is an error, the catch block will handle it and print an error message.

Alternatively, you can use the following approach to write to a file:

let fileName = "example.txt"
let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let fileURL = documentDirectory.appendingPathComponent(fileName)
do {

    let fileHandle = try FileHandle(forWritingTo: fileURL)

    defer {

        fileHandle.closeFile()

    }

    let text = "Hello, world!"

    if let data = text.data(using: .utf8) {

        fileHandle.write(data)

    }

} catch {

    print("Error writing to file: \(error.localizedDescription)")

}

Here, we first create a FileHandle using the forWritingTo: method of the FileManager class. We then defer the call to fileHandle.closeFile() to ensure that the file handle is closed after we are done writing to it.

We then convert the string to data using the data(using:) method and write it to the file using the write(_:) method of the file handle.

Again, if there is an error, the catch block will handle it and print an error message.