我在每次启动应用程序时更改文件路径时遇到问题。 我在应用程序包中有一个文件(“AppConstant.json”),我需要将该文件复制到应用程序文档目录中。我成功地将“AppConstant.json”文件保存在文档目录中创建的用户文件夹“MyFolder”中。
但问题是当我第二次重新启动应用程序时,它没有显示相同的路径。我也使用相对路径,但仍然没有得到。
这是代码 //调用目录
let stringAppConstant = copyFileFromBundleToDocumentDirectory(resourceFile: "AppConstant", resourceExtension: "json")
//保存或获取退出文件路径
func copyFileFromBundleToDocumentDirectory(resourceFile: String, resourceExtension: String) -> String
{
var stringURLPath = "Error_URLPath"
let fileManager = FileManager.default
let docURL = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
let destFolderPath = URL(string:docURL)?.appendingPathComponent("MyFolder")
let fileName = "\(resourceFile).\(resourceExtension)"
guard let newDestPath = destFolderPath, let sourcePath = Bundle.main.path(forResource: resourceFile, ofType: ".\(resourceExtension)"), let fullDestPath = NSURL(fileURLWithPath: newDestPath.absoluteString).appendingPathComponent(fileName) else {
return stringURLPath
}
if !fileManager.fileExists(atPath: newDestPath.path) {
do {
try fileManager.createDirectory(atPath: newDestPath.path,withIntermediateDirectories: true, attributes: nil)
print("Created folder successfully in :::", newDestPath.path)
} catch {
print("Error in creating folder :::",error.localizedDescription);
}
}
else {
print("Folder is already exist!")
}
if fileManager.fileExists(atPath: fullDestPath.path) {
print("File is exist in ::: \(fullDestPath.path)")
stringURLPath = fullDestPath.path
}
else {
do {
try fileManager.copyItem(atPath: sourcePath, toPath: fullDestPath.path)
print("Saved file successfully in :::", fullDestPath.path)
stringURLPath = fullDestPath.path
} catch {
print("Error in creating file ::: \(error.localizedDescription)")
}
}
return stringURLPath
}
请帮助我,我需要在沙盒中保存路径。这是我实现的正确方法吗?
我在设备和模拟器中运行,重新启动时两个路径不同 这是第一次启动的路径: /var/mobile/Containers/Data/Application/81B568A7-0932-4C3E-91EB-9DD62416DFE8/Documents/MyFolder/AppConstant.json
重新启动应用程序我得到新路径: /var/mobile/Containers/Data/Application/3DAABAC3-0DF5-415B-82A5-72B204311904/Documents/MyFolder/AppConstant.json
注意:我创建了一个示例项目,并使用相同的代码并且它正在工作。但在现有项目中它不起作用。我仅对示例和项目使用相同的包 ID 和配置文件。检查添加的文件引用、设置、版本是否都相同。
有什么想法吗?
最佳答案
容器路径周期性变化的行为是正常的。
这些行
let destFolderPath = URL(string:docURL)?.appendingPathComponent("MyFolder")
let fileName = "\(resourceFile).\(resourceExtension)"
guard let newDestPath = destFolderPath, let sourcePath = Bundle.main.path(forResource: resourceFile, ofType: ".\(resourceExtension)"), let fullDestPath = NSURL(fileURLWithPath: newDestPath.absoluteString).appendingPathComponent(fileName) else {
return stringURLPath
}
错误较多
URL(string
是错误的文件路径 API,它是URL(fileURLWithPath)
。path(forResource:ofType:)
的第二个参数不得有前导点。- API
absoluteString
作为URL(fileURLWithPath
) 的参数是错误的 - 这不是真正的错误,但不要在 Swift 中使用
NSURL
。
强烈建议始终使用 URL
相关 API 来连接路径并从 FileManager
获取文档文件夹。此外,最好的做法是让方法抛出真正的错误,而不是返回无意义的文字字符串。并且 NSSearchPathForDirectoriesInDomains
已过时,不应在 Swift 中使用。
func copyFileFromBundleToDocumentDirectory(resourceFile: String, resourceExtension: String) throws -> URL
{
let sourceURL = Bundle.main.url(forResource: resourceFile, withExtension: resourceExtension)!
let fileManager = FileManager.default
let destFolderURL = try fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent("MyFolder")
let fullDestURL = destFolderURL.appendingPathComponent(resourceFile).appendingPathExtension(resourceExtension)
if !fileManager.fileExists(atPath: destFolderURL.path) {
try fileManager.createDirectory(at: destFolderURL, withIntermediateDirectories: true, attributes: nil)
print("Created folder successfully in :::", destFolderURL.path)
try fileManager.copyItem(at: sourceURL, to: fullDestURL)
print("Saved file successfully in :::", fullDestURL.path)
} else {
print("Folder already exists!")
if fileManager.fileExists(atPath: fullDestURL.path) {
print("File exists in ::: \(fullDestURL.path)")
} else {
try fileManager.copyItem(at: sourceURL, to: fullDestURL)
print("Saved file successfully in :::", fullDestURL.path)
}
}
return fullDestURL
}
关于每次启动/重新运行应用程序时,iOS 文件路径都会发生变化,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/63423828/