I have a pNameDict as:
var pNameDict:[String: AnyObject] = [:]
This dict is populated with data from a plist file and subsequently updated with user input.
When I try to write back the data, it does not work. I do see the pNameDict getting updated but the write fails.
func saveNames() {
var pListURL: URL?
var pListData: NSData?
do {
pListURL = Bundle.main.url(forResource: "Names", withExtension: "plist", subdirectory: "")
pListData = try PropertyListSerialization.data(fromPropertyList: pNameDict, format: .binary, options: 0) as NSData
pListData?.write(to: pListURL!, atomically: false)
} catch {
print("Could not write data to plist")
}
}
Related
I'm retrieving a plist file, updating it, and writing it to disk.
1) Retrieval
func pListURL() -> URL? {
guard let result = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true).appendingPathComponent("somePlist.plist") else { return nil }
return result
}
2) Update
var data: [String: Int] = [:]
if let url = pListURL() {
do {
let dataContent = try Data(contentsOf: url)
if let dict = try PropertyListSerialization.propertyList(from: dataContent, format: nil) as? [String: Int] {
data = dict
}
} catch {
print(error)
}
}
// update code
3) Write
if let path = pListURL() {
do {
let plistData = try PropertyListSerialization.data(fromPropertyList: data, format: .xml, options: 0)
try plistData.write(to: path)
} catch {
print(error)
}
}
The odd thing is I get an error that says:
The file “somePlist.plist” couldn’t be opened because there is no such file.
even though when I check the plist, it's actually properly created and updated as it should be. As far as I know, the create parameter of FileManager.default.url(for:in:appropriateFor:create: ) ensures that it "creates the directory if it does not already exist", which means somePlist.plist is created if plist doesn't exist already.
As far as I know, the create parameter of FileManager.default.url(for:in:appropriateFor:create: ) ensures that it "creates the directory if it does not already exist", which means somePlist.plist is created if plist doesn't exist already.
No, it means the directory is created but the file is not created.
In the update part ignore the couldn’t be opened error and write the (new) data to disk or check if the file exists with fileExists(atPath.
And you can declare the return value in pListURL as non-optional. It's guaranteed that the folder Documents exists
func pListURL() -> URL {
return try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent("somePlist.plist")
}
Update:
These are reliable versions of update and write
func update(dictionary: [String:Int]) {
let url = pListURL()
guard FileManager.default.fileExists(atPath: url.path) else { write(dictionary: dictionary); return }
do {
let dataContent = try Data(contentsOf: url)
if var dict = try PropertyListSerialization.propertyList(from: dataContent, format: nil) as? [String: Int] {
for (key, value) in dictionary {
dict.updateValue(value, forKey: key)
}
write(dictionary: dict)
} else {
write(dictionary: dictionary)
}
} catch {
print(error)
}
}
func write(dictionary: [String:Int]) {
let url = pListURL()
do {
let plistData = try PropertyListSerialization.data(fromPropertyList: dictionary, format: .xml, options: 0)
try plistData.write(to: url)
} catch {
print(error)
}
}
I am trying to use a file called Data.plist to store some simple unstructured data, and I placed this file at the root folder of my app. To make it simple to read/write to this file, I created the following DataManager struct. It can read Data.plist file with no problem, but it cannot write data to the file. I am not sure where the problem is, could anyone spot where might be wrong?
struct DataManager {
static var shared = DataManager()
var dataFilePath: String? {
return Bundle.main.path(forResource: "Data", ofType: "plist")
}
var dict: NSMutableDictionary? {
guard let filePath = self.dataFilePath else { return nil }
return NSMutableDictionary(contentsOfFile: filePath)
}
let fileManager = FileManager.default
fileprivate init() {
guard let path = dataFilePath else { return }
guard fileManager.fileExists(atPath: path) else {
fileManager.createFile(atPath: path, contents: nil, attributes: nil) // create the file
print("created Data.plist file successfully")
return
}
}
func save(_ value: Any, for key: String) -> Bool {
guard let dict = dict else { return false }
dict.setObject(value, forKey: key as NSCopying)
dict.write(toFile: dataFilePath!, atomically: true)
// confirm
let resultDict = NSMutableDictionary(contentsOfFile: dataFilePath!)
print("saving, dict: \(resultDict)") // I can see this is working
return true
}
func delete(key: String) -> Bool {
guard let dict = dict else { return false }
dict.removeObject(forKey: key)
return true
}
func retrieve(for key: String) -> Any? {
guard let dict = dict else { return false }
return dict.object(forKey: key)
}
}
You cannot modify the files inside your app bundle. So all the files that you get with Bundle.main.path(forResource:ofType:) are readable but not writable.
If you want to modify this file you will need to copy it inside your app's document directory first.
let initialFileURL = URL(fileURLWithPath: Bundle.main.path(forResource: "Data", ofType: "plist")!)
let documentDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last!
let writableFileURL = documentDirectoryURL.appendingPathComponent("Data.plist", isDirectory: false)
do {
try FileManager.default.copyItem(at: initialFileURL, to: writableFileURL)
} catch {
print("Copying file failed with error : \(error)")
}
// You can modify the file at writableFileURL
I am trying to upload a video to a server file through Alamofire but I couldn't get the "data" going to be passed..its always nil
var videoURL = NSURL(string: "")
//returns Optional(file:///private/var/mobile/Containers/Data/Application/1FB40086-228B-4011-A9D4-7874E2EEF9F4/tmp/4A6AAD76-B899-4B67-8E96-925DA4AE9E93.mov)
let videodata = NSData(contentsOfFile: (videoURL?.absoluteString)!)
//nil
let url = NSURL(fileURLWithPath: (videoURL?.absoluteString)!)
let videodata = NSData(contentsOf: url as URL)
//nil
If I get data would lead a way for me to do this:
Alamofire.upload(multipartFormData: { multipartFormData in
multipartFormData.append (videodata as! Data, withName: "file", fileName: "file.mov", mimeType: "video/quicktime")
enter code here
EDIT::
thank you guys, with your help I have struggled my way out of there to this file not found error, but I can see the file is being saved in my gallery, any clue would save my day.
print (videoURL!)
//returns file:///private/var/mobile/Containers/Data/Application/3F280477-DA16-4A67-AE60-D6247143352E/tmp/1E4AC002-6AD0-41E1-9E0D-A09B697F81F7.mov
print (videoURL!.path!)
// returns /private/var/mobile/Containers/Data/Application/3F280477-DA16-4A67-AE60-D6247143352E/tmp/1E4AC002-6AD0-41E1-9E0D-A09B697F81F7.mov
var videoData = NSData()
let path = videoURL!.path!
if FileManager.default.fileExists(atPath: path) {
}else {
print("Could not fin file at url: \(videoURL!.path!)")
// here it throws file not found
}
In Swift 3 use native URL and Data instead of NSURL and NSData.
if let videoURL = URL(string: urlString), let videodata = try? Data(contentsOf: videoURL) {
//Add code of Alamofire here
}
Using absoluteString returns a string that includes file:// at the beginning and you don't want that. You need to return the path of the URL
guard let videoPathString = videoURL.path as? String else {
//handle error here if you can't create a path string
return
}
var videoData = NSData()
//check if file exists at this path first
if (NSFileManager.defaultManager().fileExistsAtPath(videoPathString)) {
videoData = NSData(contentsOfFile: NSString(videoPathString))
} else {
//if file does not exist at that path, handle here
}
I'm trying to make the conversion from Objc to swift and have had better days.
I have a class with a dictionary:
collaborationDictionary:[String:Set<String>]
I am trying to write/read this dictionary to/from a file and just can't quite seem to make it work. I have to save the dictionary using the following JSON structure and I have to use SwiftyJSON.
{ "Collaborations" : {
"5604" : [
"whiteboard.png",
"VID_20161123_135117.3gp",
"Photo_0.jpeg"]
"5603" : [
"VID_20161123_135117.3gp"],
"5537" : [
"Screenshot_20151212-132454.png",
"VID_20161202_083205.3gp",
"VID_20161123_135117.3gp",
"Photo_0.jpeg",
"Screenshot_20151212-132428.png",
"Screenshot_20151212-132520.png",
"IMG_20161017_132105.jpg",
"whiteboard.png"]}
}
I don't have any real problem with finding/retrieving the file or writing the file. I just can't quite figure out how to manually load SwiftyJSON. I need to have a JSON object called "Collaborations" at the top. It needs to contain a dictionary of collaboration IDs (5604, 5603...). Each collaboration contains an array of string (filenames). I'm including the code I'm using to read/write the file but I need help with the SwiftyJSON library.
This is the member data member I'm using to store the above data:
These are the functions I need to finish:
private var collaborationDictionary:[String:Set<String>] = [:]
func getUploadedFileSet() {
collaborationDictionary = [:]
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
if FileManager.default.fileExists(atPath: (jsonFileURL?.absoluteString)!) {
do {
let data = try Data(contentsOf: jsonFileURL!, options: .alwaysMapped)
let json = JSON(data: data)
// ************************************************
// NEED HELP START
// NOW WHAT???? What is the SwiftyJSON code
?????????????????????????
// NEED HELP END
// ************************************************
} catch let error {
print(error.localizedDescription)
}
}
}
func saveUploadedFilesSet() {
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
do {
let dirExists = FileManager.default.fileExists(atPath: (appURL?.absoluteString)!)
if !dirExists {
try FileManager.default.createDirectory(atPath: (appURL?.absoluteString)!, withIntermediateDirectories: false, attributes: nil)
}
// ************************************************
// NEED HELP START
// NOW WHAT???? What is the SwiftyJSON code
?????????????????????????
// NEED HELP END
// ************************************************
// Write to file code - haven't written it yet but that should be easy
} catch let error as NSError {
print(error.localizedDescription);
}
}
Any direction would be greatly appreciated. Thanks!
EDIT
I was able to figure out how to load the supplied JSON structure from file. Here is the code:
func getUploadedFileSet() {
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
if FileManager.default.fileExists(atPath: (jsonFileURL?.absoluteString)!) {
do {
let data = try Data(contentsOf: jsonFileURL!, options: .alwaysMapped)
let json = JSON(data: data)
if json != nil {
for (key, subJson) in json[kCollaborations] {
let stringArray:[String] = subJson.arrayValue.map { $0.string! }
let stringSet = Set(stringArray)
collaborationDictionary.updateValue(stringSet, forKey: key)
}
} else {
print("Could not get json from file, make sure that file contains valid json.")
}
} catch let error {
print(error.localizedDescription)
}
}
I still haven't figured out how to save the collaborationDictionary object to file. My biggest problem is figuring out how to put in the "Collaborations" key. Any ideas?
I finally got this to work. The biggest problem was that I couldn't convert collaborationDictionary to JSON. I finally had to convert it to a dictionary of arrays vs dictionary of sets. Here are the 2 methods:
// **************************************************************************
func getUploadedFileSet() {
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
if FileManager.default.fileExists(atPath: (jsonFileURL?.absoluteString)!) {
do {
let data = try Data(contentsOf: jsonFileURL!, options: .alwaysMapped)
let json = JSON(data: data)
if json != nil {
for (key, subJson) in json[kCollaborations] {
let stringArray:[String] = subJson.arrayValue.map { $0.string! }
let stringSet = Set(stringArray)
collaborationDictionary.updateValue(stringSet, forKey: key)
}
} else {
print("Could not get json from file, make sure that file contains valid json.")
}
} catch let error {
print(error.localizedDescription)
}
}
}
// **************************************************************************
func saveUploadedFilesSet() {
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
let adjustedJSONFileURL = URL(fileURLWithPath:(jsonFileURL?.absoluteString)!)
do {
let dirExists = FileManager.default.fileExists(atPath: (appURL?.absoluteString)!)
if !dirExists {
try FileManager.default.createDirectory(atPath: (appURL?.absoluteString)!, withIntermediateDirectories: false, attributes: nil)
}
// Convert set elements to arrays
var convertedCollaborationDictionary: [String:[String]] = [:]
for (sessionID, fileNameSet) in collaborationDictionary {
let array = Array(fileNameSet)
convertedCollaborationDictionary.updateValue(array, forKey: sessionID)
}
let json: JSON = JSON(convertedCollaborationDictionary)
let fullJSON: JSON = [kCollaborations:json.object]
let data = try fullJSON.rawData()
try data.write(to: adjustedJSONFileURL, options: .atomic)
} catch let error as NSError {
print(error.localizedDescription);
}
}
If you dig into the source, SwiftyJSON wraps JSONSerialization, which can both be initialized and converted back to Data which is knows how to read and write itself from disk:
func readJSON() -> JSON? {
guard let url = Bundle.main.url(forResource: "data", withExtension: "json"),
let data = try? Data(contentsOf: url) else {
return nil
}
return JSON(data: data)
}
func write(json: JSON, to url: URL) throws {
let data = try json.rawData()
try data.write(to: url)
}
Note that you can load your static data from anywhere including your Bundle, but you can only write to the sandbox (ie the Documents directory). You may wish to copy from your Bundle to the documents directory on first run if you are planning on reading/writing to the same file.
Also your sample JSON is bad (lint it). You need a comma after "Photo_0.jpeg"]
func readWriteData(){
let paths = NSSearchPathForDirectoriesInDomains(.CachesDirectory, .UserDomainMask, true)
let cachePath = paths.first
// let bundleName = NSBundle.mainBundle().infoDictionary?["CFBundleVersion"] as? String
let filePath = NSURL(fileURLWithPath: cachePath!).URLByAppendingPathComponent("cachedProducts.plist").path
var isDir : ObjCBool = false
var error: NSError?
if NSFileManager.defaultManager().fileExistsAtPath(filePath!, isDirectory: &isDir) {
var plistArray = NSArray(contentsOfFile: filePath!)
print(plistArray)//retrieving stored data
}else {
do {
try NSFileManager.defaultManager().createDirectoryAtPath(filePath!, withIntermediateDirectories: false, attributes: nil)
var cachedArray = [AnyObject]()
cachedArray.append("Harsh")
let cachedProductarray : NSArray = cachedArray
cachedProductarray.writeToFile(filePath!, atomically: true)
//Storing data to plist
} catch let error as NSError {
NSLog("\(error.localizedDescription)")
}
}
}
when i try to print plistArray it's returning nil. Please help me with the solution. I tried this using cachesDirectory and Document Directory it's the same scenario with both
The cache directory is supposed to be created at cachePath, not at filePath.
Rather than using the quite primitive writeToFile method of NSArray I'd recommend to use NSPropertyListSerialization in conjunction with NSData's writeToFile:options:error (still better writeToURL...) method to get meaningful error messages.