앱 샌드박스 디렉터리

App 샌드박스 디렉터리

문서 디렉터리 찾기

import Foundation

let fm = FileManager.default
let docs = fm.urls(for: .documentDirectory, in: .userDomainMask).first!
print("Documents path ends correctly: \(docs.lastPathComponent)")

파일 URL 만들기

import Foundation

let fm = FileManager.default
let docs = fm.urls(for: .documentDirectory, in: .userDomainMask).first!
let file = docs.appendingPathComponent("profile.json")
print(file.lastPathComponent)

캐시 디렉터리

import Foundation

let fm = FileManager.default
let caches = fm.urls(for: .cachesDirectory, in: .userDomainMask).first!
print("Caches dir name: \(caches.lastPathComponent)")

임시 디렉터리

import Foundation

let tmp = FileManager.default.temporaryDirectory
let scratch = tmp.appendingPathComponent("work.tmp")
print("Temp file path ready: \(scratch.lastPathComponent)")

문서 vs 캐시 vs 임시 파일

import Foundation

// Choose the right folder for the data's lifetime.
print("Documents = backed up, Caches = purgeable, tmp = transient")

애플리케이션 지원

import Foundation

let fm = FileManager.default
let support = fm.urls(for: .applicationSupportDirectory, in: .userDomainMask).first!
try? fm.createDirectory(at: support, withIntermediateDirectories: true)
print("Ensured Application Support exists")

문서에 저장하기

import Foundation

let fm = FileManager.default
let docs = fm.urls(for: .documentDirectory, in: .userDomainMask).first!
let url = docs.appendingPathComponent("note.txt")
try? "hello".write(to: url, atomically: true, encoding: .utf8)
print("Saved into Documents")

다시 읽기

import Foundation

let fm = FileManager.default
let docs = fm.urls(for: .documentDirectory, in: .userDomainMask).first!
let url = docs.appendingPathComponent("note.txt")
if let text = try? String(contentsOf: url, encoding: .utf8) {
    print(text)
}

백업에서 제외하기

import Foundation

var url = URL(fileURLWithPath: "/tmp/big.cache")
var values = URLResourceValues()
values.isExcludedFromBackup = true
try? url.setResourceValues(values)
print("Marked excluded from backup")

샌드박스가 중요한 이유

import Foundation

// Never hardcode /var/mobile/... — resolve at runtime instead.
let fm = FileManager.default
let docs = fm.urls(for: .documentDirectory, in: .userDomainMask).first!
print("Resolved Documents dynamically: \(!docs.path.isEmpty)")

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