File System

File System

Work with the app sandbox using FileManager, document directories, and data read/write APIs.

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Locate Directories

Use FileManager to find the Documents and Caches folders.

Syntax: FileManager.default.urls(for:in:), e.g. .documentDirectory, .cachesDirectory

Example

Directories.swift

ContentView.swift

App.swift

import Foundation

let docs = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let caches = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first!
print("Docs:", docs)
print("Caches:", caches)

This example locates the sandboxed Documents and Caches directories.

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Read & Write

Write and read text or binary data using Data and String APIs.

Syntax:

• try data.write(to: url)
• let data = try Data(contentsOf: url)
• try text.write(to: url, atomically:encoding:)

Example

ReadWrite.swift

ContentView.swift

App.swift

import Foundation

let docs = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let file = docs.appendingPathComponent("hello.txt")

// Write text
let text = "Hello files!"
try? text.write(to: file, atomically: true, encoding: .utf8)

// Read text
let loaded = try? String(contentsOf: file, encoding: .utf8)
print(loaded ?? "")

This example writes a text file in Documents and reads it back.

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Create and Remove

Create folders with createDirectory and delete entries with removeItem.

Syntax:

• try FileManager.default.createDirectory(at:withIntermediateDirectories:)
• try FileManager.default.removeItem(at:)

Example

CreateRemove.swift

ContentView.swift

App.swift

import Foundation

let docs = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let folder = docs.appendingPathComponent("Temp")
try? FileManager.default.createDirectory(at: folder, withIntermediateDirectories: true)
try? FileManager.default.removeItem(at: folder)