在每次启动应用程序时更改文件路径时遇到问题。 我在应用程序捆绑包中有一个文件（“ AppConstant.json”），我需要将此文件复制到应用程序文档目录中。我已成功将“ AppConstant.json”文件保存在文档目录中创建的用户文件夹“ MyFolder”中。
但是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。另外，我正在使用relativepath，但仍然没有得到。
这是代码 //调用目录
<div v-if="condition=='true'>
<input :name="user.name" class="form-control input-md" type="text" :v-model="user.user_value" :v-validate="'required'" :class="['form-control', {'is-invalid': errors.has(user.name)}]"/>
<div :v-show="errors.has(user.name)" class="invalid-feedback">
{{ errors.first(user.name) }}
</div>
</div>
export default {
data() {
return {
user: {},
form: new Form({
contact: "",
}),
};
},
methods: {
getvalues() {
axios.get(APP_URL + `/api/get-values?Id=${id}`, { headers: header })
.then((response) => {
for (var i = 0;i < response.data.list[0].student.length; i++) {
var id = response.data.list[0].student[i].id;
var name = response.data.list[0].student[i].name;
}
this.form.user.push({
id: id,
name: name,
user_value: "",
});
}
},
//保存或获取退出文件路径
let stringAppConstant = copyFileFromBundleToDocumentDirectory(resourceFile: "AppConstant", resourceExtension: "json")
请帮助我，我需要在Sandbox中保存路径。我实施的方法正确吗？
我正在设备和模拟器中运行，重新启动时两条路径都不同 这是首次启动的路径： /var/mobile/Containers/Data/Application/81B568A7-0932-4C3E-91EB-9DD62416DFE8/Documents/MyFolder/AppConstant.json
重新启动我正在获取新路径的应用程序： /var/mobile/Containers/Data/Application/3DAABAC3-0DF5-415B-82A5-72B204311904/Documents/MyFolder/AppConstant.json
注意：我创建了一个示例项目，并且使用了相同的代码，并且可以正常工作。但是在现有项目中，它不起作用。我仅对示例和项目使用相同的捆绑软件ID和配置文件。检查添加的文件的参考，设置，版本是否相同。
有什么主意吗？
答案 0 :(得分：0)
您好，我创建了新项目，并使用了与main中发布的相同的代码，并且可以正常工作。但是在实际项目中，它不起作用。
不确定项目中到底发生了什么，请尝试对其进行调试。这也是开发的一部分。 ：）
如果您在本周末急于解决此问题，请尝试使用以下代码段。
#!/bin/bash
# exit on error
set -e
set -o pipefail
cleanup() {
# make sure the temporary file is removed
rm -f "$tmp"
}
trap cleanup EXIT
# create a temporary file in the home directory
tmp="$(mktemp -p ~)"
target="${HOME}/.profile"
# run your command and redirect the output to the temporary file
envconsul env | awk '{print "export " $0}' > "$tmp"
# set the same permissions as the current file has
chmod --reference="$target" "$tmp"
# move the temporary file into place
mv -f "$tmp" "$target"
为什么不成功执行文件操作就只返回// collect data from bundle
let constFileURL = Bundle.main.url(forResource: "AppConst", withExtension: "json")!
let data = try! Data(contentsOf: constFileURL)
// try to write data in document directory
do {
let constFileURL = try saveFileInDocumentDirectory(filePath: "MyFolder/AppConst.json", data: data)
// use your `constFileURL`
} catch (let error as FileOperationError) {
switch error {
case .fileAlreadyExists(let url):
let data = try! Data(contentsOf: url)
print(String(data: data, encoding: .utf8))
case .IOError(let error):
print("IO Error \(error)")
}
} catch {
print("Unknown Error \(error)")
}
// Helpers
enum FileOperationError: Error {
case fileAlreadyExists(url: URL)
case IOError(Error)
}
func saveFileInDocumentDirectory(filePath: String, data: Data) throws -> URL {
// final destination path
let destURLPath = fullURLPathOf(filePath, relativeTo: .documentDirectory)
// check for file's existance and throw error if found
guard FileManager.default.fileExists(atPath: destURLPath.path) == false else {
throw FileOperationError.fileAlreadyExists(url: destURLPath)
}
// Create Intermidiate Folders
let intermidiateDicPath = destURLPath.deletingLastPathComponent()
if FileManager.default.fileExists(atPath: intermidiateDicPath.path) == false {
do {
try FileManager.default.createDirectory(at: intermidiateDicPath, withIntermediateDirectories: true, attributes: nil)
} catch {
throw FileOperationError.IOError(error)
}
}
// File Writing
do {
try data.write(to: destURLPath, options: .atomic)
} catch {
throw FileOperationError.IOError(error)
}
return destURLPath
}
func fullURLPathOf(_ relativePath: String, relativeTo dic:FileManager.SearchPathDirectory ) -> URL {
return FileManager.default.urls(for: dic, in: .userDomainMask).first!.appendingPathComponent(relativePath)
}
？如果以后需要访问路径，则始终可以使用"MyFolder/\(fileName)" API进行。
FileManager答案 1 :(得分：0)
容器路径定期更改的行为是正常的。
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
}
可以犯很多错误
URL(string是错误的文件路径API，它是URL(fileURLWithPath)。path(forResource:ofType:)的第二个参数不能有前导点。absoluteString作为URL(fileURLWithPath的参数是错误的NSURL。强烈建议始终使用URL相关的API来连接路径并从FileManager获取document文件夹。此外，优良作法是使方法throw成为真正的错误，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
}