AssetSaveHelper.swift

struct AssetSaveHelper {
	
	static var documentsDirectoryUrl: URL? {
		 return FileManager().urls(for: .cachesDirectory, in: .userDomainMask).first
	}
	
	static var cacheURL: URL? {
		guard let url = documentsDirectoryUrl else {
			return nil
		}
		let cacheURL = url.appendingPathComponent("images", isDirectory: true)
		return cacheURL
	}
	
	static func cacheDataForTag(_ data: Data, tag: String) throws {
		guard let cacheURL = cacheURL else {
			return
		}
		let path = cacheURL.path
		if !FileManager().fileExists(atPath: path) {
			do {
				try FileManager().createDirectory(at: cacheURL, withIntermediateDirectories: false, attributes: nil)
			} catch let err {
				throw err
			}
		}
		
		let dataURL = cacheURL.appendingPathComponent(tag)
		do {
			try data.write(to: dataURL, options: [.atomic])
		} catch let err {
			throw err
		}
	}
	
	static func cachedDataForTag(_ tag: String?) throws -> Data? {
		guard let tag = tag, let dataURL = cacheURL?.appendingPathComponent(tag) else {
			return nil
		}
		do {
			let data = try Data(contentsOf: dataURL)
			return data
		} catch let err {
			throw err
		}
	}
	
	static func clearDirectory() {
		guard let documentsUrl = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).last else {
			return
		}
		do {
			if let directoryName = try FileManager.default.contentsOfDirectory(atPath: documentsUrl.path).first(where: { $0 == "images" }) {
				let file = documentsUrl.appendingPathComponent(directoryName)
				do {
					try FileManager.default.removeItem(at: file)
				} catch let err {
					print(err.localizedDescription)
				}
			}
		} catch let err {
			print(err.localizedDescription)
		}
	}
}