我创建了这个 FileManager
extension
。有了这个扩展名
,我想创建一个像这样的文件层次结构:
- Application Support
- Favorites
- Feed
- Images
这是我在 FileManager
extension
中的代码,我会在应用程序启动后立即在 app delegate
中调用它。然后我将使用此代码始终检索文件夹的 path
。
这是创建此层次结构并在我需要时检索路径的好方法吗?这是好习惯吗?
extension FileManager {
static func createOrFindApplicationDirectory() -> URL? {
let bundleID = Bundle.main.bundleIdentifier
// Find the application support directory in the home directory.
let appSupportDir = self.default.urls(for: .applicationSupportDirectory, in: .userDomainMask)
guard appSupportDir.count > 0 else {
return nil
}
// Append the bundle ID to the URL for the Application Support directory.
let dirPath = appSupportDir[0].appendingPathComponent(bundleID!)
// If the directory does not exist, this method creates it.
do {
try self.default.createDirectory(at: dirPath, withIntermediateDirectories: true, attributes: nil)
return dirPath
} catch let error {
print("Error creating Application Support directory with error: \(error)")
return nil
}
}
static func createOrFindFavoritesDirectory() -> URL? {
guard let appSupportDir = createOrFindApplicationDirectory() else {
return nil
}
let dirPath = appSupportDir.appendingPathComponent("Favorites")
// If the directory does not exist, this method creates it.
do {
try self.default.createDirectory(at: dirPath, withIntermediateDirectories: true, attributes: nil)
return dirPath
} catch let error {
print("Error creating Favorites directory with error: \(error)")
return nil
}
}
static func createOrFindFeedDirectory() -> URL? {
guard let appSupportDir = createOrFindFavoritesDirectory() else {
return nil
}
let dirPath = appSupportDir.appendingPathComponent("Feed")
// If the directory does not exist, this method creates it.
do {
try self.default.createDirectory(at: dirPath, withIntermediateDirectories: true, attributes: nil)
return dirPath
} catch let error {
print("Error creating Favorites directory with error: \(error)")
return nil
}
}
static func currentImagesDirectory() -> URL? {
guard let feedDir = createOrFindFeedDirectory() else {
return nil
}
let dirPath = feedDir.appendingPathComponent("Images")
// If the directory does not exist, this method creates it.
do {
try self.default.createDirectory(at: dirPath, withIntermediateDirectories: true, attributes: nil)
return dirPath
} catch let error {
print("Error creating Images directory with error: \(error)")
return nil
}
}
}
最佳答案
它看起来不错,但您可以结合一些代码并进行更好的错误检查:
extension FileManager {
static func createOrFindApplicationDirectory() -> URL? {
guard let bundleID = Bundle.main.bundleIdentifier else {
return nil
}
// Find the application support directory in the home directory.
let appSupportDirArray = self.default.urls(for: .applicationSupportDirectory, in: .userDomainMask)
guard let appSupportDir = appSupportDirArray.first else {
return nil
}
// Append the bundle ID to the URL for the Application Support directory.
let dirPath = appSupportDir.appendingPathComponent(bundleID)
// If the directory does not exist, this method creates it.
do {
try self.default.createDirectory(at: dirPath, withIntermediateDirectories: true, attributes: nil)
return dirPath
} catch let error {
print("Error creating Application Support directory with error: \(error)")
return nil
}
}
static func createOrFindDirectory(named name: String) -> URL? {
guard let appSupportDir = createOrFindApplicationDirectory() else {
return nil
}
let dirPath = appSupportDir.appendingPathComponent(name)
// If the directory does not exist, this method creates it.
do {
try self.default.createDirectory(at: dirPath, withIntermediateDirectories: true, attributes: nil)
return dirPath
} catch let error {
print("Error creating \(name) directory with error: \(error)")
return nil
}
}
static func currentImagesDirectory() -> URL? {
guard let feedDir = createOrFindDirectory(named: "Feed") else {
return nil
}
let dirPath = feedDir.appendingPathComponent("Images")
// If the directory does not exist, this method creates it.
do {
try self.default.createDirectory(at: dirPath, withIntermediateDirectories: true, attributes: nil)
return dirPath
} catch let error {
print("Error creating Images directory with error: \(error)")
return nil
}
}
}
关于iOS - FileManager 扩展的最佳实践,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41643818/