XCode 7, Swift 2. (don't even start on me about that, it's not my favorite set of constraints either)
So I'm sending data using node-apn (BIG thanks to those folks!). I'm using the (pushkit option) *.voip topic and I got all that working. I can see the notification is received on my device (big shout out to libimobiledevice).
In composing the note on my server i'm doing
var note = new apn.Notification();
note.topic = 'mine.voip';
note.payload = {
message: 'text',
somethingElse: 'this other one '
payload: {
k1: v1,
k2: {
k3: v2
}
}
};
How am I supposed to get at my payload object? Following some (3rd party) pushkit examples (maybe it was 1? that showed like
func pushRegistry(registry: PKPushRegistry!, didReceiveIncomingPushWithPayload payload: PKPushPayload!, forType type: String!) {
let payloadDict = payload.dictionaryPayload["aps"] as? Dictionary<String, String>
let message = payloadDict?["alert"]
}
I tried to mimic it like
let myWeirdPayload = payload.dictionaryPayload["payload"] as? Dictionary<String, String>
or even
let myWeirdPayload = payload.dictionaryPayload["payload"] as? Dictionary<String, Any>
but those don't work (I get nil).
How am I supposed to do this?
Here's how I log it in Obj-C:
NSLog(#"pushRegistry:didReceiveIncomingPushWithPayload:forType:withCompletionHandler:%#",
payload.dictionaryPayload);
Let me try to make this clear by explaining the relation between PKPushPayload and its NSDictionary property with the data you are looking for.
For the func pushRegistry(registry: PKPushRegistry!, didReceiveIncomingPushWithPayload payload: PKPushPayload!, forType type: String!) you have the payload argument which is a PKPushPayload.
The data you are looking for are stored in the _dictionaryPayload which is a NSDictionary and it is a property of the payload argument.
So to access the data you can do:
let payloadDictionary = payload.dictionaryPayload as NSDictionary
let myData = payloadDictionary.value(forKey: "myData_unique_key")
Related
Hope you're doing well!
I've built an app that generates a view from a .csv file that I have hosted on my website. I've previously managed to get everything working as expected where I called the csv from the website and wrote the contents directly to a variable and then processed it from there. Obviously this wasn't good practice as the app started mis-behaving when the internet couldn't be accessed (despite writing in connectivity checks).
I've now built out the app to call the URL, save the csv with Filemanager, then when the app refreshes, it will use FileManager.default.replaceItemAt to replace the previous version if there is internet connectivity, if not the app builds from the previously stored .csv
This all works fine when the app is running, however I'm running into issues with the background processing task. It seems the app doesn't have permissions to write with FileManager when it is executed from the background task. Is there an additional step I'm missing when using this in background tasks? I've attempted to use FileManager.default.removeItem followed by FileManager.default.copyItem instead of replaceItemAt but it doesn't seem to make a difference as expected.
UPDATE 22/06 - Still scouring the internet for similar issues or examples I think I might be going down the wrong rabbit hole here. This could be issues with the way the new background task has been configured for retrieving data from my website, although the background tasks worked fine before there seems to be a bit more legwork needed for this method to work as a background task.
func handleAppRefresh(task: BGProcessingTask) {
//Schedules another refresh
scheduleAppRefresh()
DispatchQueue.global(qos: .background).async {
pullData()
print("BG Background Task fired")
}
pullData() will call loadCSV() and then do some data processing. At the moment I'm just using a print straight after loadCSV() is called to validate if the downloads etc are successful.
// Function to pass the string above into variables set in the csvevent struct
func loadCSV(from csvName: String) -> [CSVEvent] {
var csvToStruct = [CSVEvent]()
// Creates destination filepath & filename
let documentsUrl:URL = (FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first as URL?)!
let destinationFileUrl = documentsUrl.appendingPathComponent("testcsv.csv")
//Create URL to the source file to be downloaded
let fileURL = URL(string: "https://example.com/testcsv.csv")!
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = URLRequest(url:fileURL)
let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in
if let tempLocalUrl = tempLocalUrl, error == nil {
if let statusCode = (response as? HTTPURLResponse)?.statusCode {
print("File downloaded Successfully. Response: \(statusCode)")
}
do {
let _ = try FileManager.default.replaceItemAt(destinationFileUrl, withItemAt: tempLocalUrl)
} catch (let writeError) {
print("Error creating a file \(destinationFileUrl) : \(writeError)")
}
} else {
print("Error" )
}
}
task.resume()
let data = readCSV(inputFile: "testcsv.csv")
var rows = data.components(separatedBy: "\n")
rows.removeFirst()
// Iterates through each row and sets values
for row in rows {
let csvColumns = row.components(separatedBy: ",")
let csveventStruct = CSVEvent.init(raw: csvColumns)
csvToStruct.append(csveventStruct)
}
print("LoadCSV has run and created testcsv.csv")
return csvToStruct
}
Any help or pointers to why these files aren't being updated in background tasks but are working fine in app would be massively appreciated!
Thanks in advance.
EDIT: adding new BGProcessingTask
func handleAppRefresh(task: BGProcessingTask) {
//Schedules another refresh
print("BG Background Task fired")
scheduleAppRefresh()
Task.detached {
do {
let events = try await loadCSV(from: "Eventtest").filter { !dateInPast(value: $0.date) }
print(events)
pullData(events: events)
} catch {
print(error)
}
}
}
The problem is not the background task per se, the problem is the asynchronous behavior of downloadTask. readCSV is executed before the data is downloaded.
In Swift 5.5 and later async/await provides asynchronous behavior but the code can be written continuously.
func loadCSV(from csvName: String) async throws -> [CSVEvent] {
var csvToStruct = [CSVEvent]()
// Creates destination filepath & filename
let documentsUrl:URL = (FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first as URL?)!
let destinationFileUrl = documentsUrl.appendingPathComponent("testcsv.csv")
//Create URL to the source file to be downloaded
let fileURL = URL(string: "https://example.com/testcsv.csv")!
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = URLRequest(url:fileURL)
let (url, response) = try await session.download(for: request)
if let statusCode = (response as? HTTPURLResponse)?.statusCode {
print("File downloaded Successfully. Response: \(statusCode)")
}
let _ = try FileManager.default.replaceItemAt(destinationFileUrl, withItemAt: url)
let data = readCSV(inputFile: "testcsv.csv")
var rows = data.components(separatedBy: "\n")
rows.removeFirst()
// Iterates through each row and sets values
for row in rows {
let csvColumns = row.components(separatedBy: ",")
let csveventStruct = CSVEvent.init(raw: csvColumns)
csvToStruct.append(csveventStruct)
}
print("LoadCSV has run and created testcsv.csv")
return csvToStruct
}
To call the function you have to wrap it in a detached Task which replaces the GCD queue
Task.detached {
do {
let events = try await loadCSV(csvName: "Foo")
print("BG Background Task fired")
} catch {
print(error)
}
}
as a coding exercise, I wrote a small program to take MySql data frm the web to the iPhone. On the server side. I wrote the php script to get the script to return the json data.
On xcode I have
[code]
.
.
.
let jsonString = try? JSONSerialization.jsonObject(with: data!, options: [])
print(jsonString!)
.
.
.
[/code]
In xcode console, I have this:
[code]
(
{
Address = "1 Infinite Loop Cupertino, CA";
Latitude = "37.331741";
Longitude = "-122";
Name = Apple;
}
)
[/code]
I have a function
[code]
func convertToDictionary(text: String) -> [String: Any]? {
if let data = text.data(using: .utf8) {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
} catch {
print(error.localizedDescription)
}
}
return nil
}
[/code]
When I pass the jsonString to convertToDictionary(text:)
[code]
let dict = convertToDictionary(text: jsonString as! String)
[/code]
In the console I get an error "Could not cast value of type '__NSSingleObjectArrayI' (0x10369bdb0) to 'NSString' (0x1004eac60)."
but if I hard code the json string then pass it to the convertToDictionary(text:)
[code]
let hardCodedStr = "{\"Address\":\"1 Infinite Loop Cupertino, CA\",\"Latitude\":\"37.331741\",\"Longitude\":\"-122\",\"Name\":\"Apple\"}"
let dict = convertToDictionary(text: hardCodedStr)
print(dict!)
[/code]
It works just fine. Why is that? Thanks
If you look closely at what jsonObject(with:options:) returns, you will see that it is a [String: Any] or a [Any], depending on your JSON.
Therefore, jsonString here actually stores a [String: Any], even thought the compiler thinks it is of type Any:
let jsonString = try? JSONSerialization.jsonObject(with: data!, options: [])
print(jsonString!)
If you try to pass this to convertToDictionary, which accepts a String, it of course will not work, because a dictionary and String are not compatible types.
How to solve this problem?
The problem is already solved! You don't need convertToDictionary at all. jsonString itself is the dictionary you wanted.
This is what you need to do:
let jsonString = try? JSONSerialization.jsonObject(with: data!, options: []) as! [String: Any]
^^^^^^^^^^^^^^^^^
Add this part
After that you can call dictionary methods on jsonString. I also suggest you to rename jsonString to something else.
I am new to Siesta. How can I get the entire array and pass into my model? Besides, how can I post with params? In their documentation I couldn't find any of this.
I'm new to siesta as well. I was able to find documentation about requests here http://bustoutsolutions.github.io/siesta/guide/requests/
Basically you'll setup your resource and then call:
resource.request(.post, json: ["foo": [1,2,3]])
Your question is far too complex so I will try to explain you in a simple way.
Siesta provides a great way to map your models by using Custom Transformers. One simple way to do this is to implement the Decodable protocol provided by Swift 4+:
Lets say we want to decode this JSON response:
{
"id": 1,
"name": "Oswaldo",
"email": "omaestra#gmail.com"
}
Into our great User class which implements the Decodable protocol:
class User: Decodable {
var id: Int
var name: String
var email: String
private enum CodingKeys: String, CodingKey {
case id, name, email
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
id = try container.decode(Int.self, forKey: .id
name = try container.decode(String.self, forKey: .name)
email = try container.decode(String.self, forKey: .email)
}
}
Awesome! Now we can decode the JSON response from our server into our awesome User class.
Next, inside our Siesta.Service class we can configure our custom transformers for specific resources:
class API: Siesta.Service {
init() {
super.init(baseURL: "https://api.example.com")
// Some initial configuration
}
let myAPI = API()
// –––––– Global configuration ––––––
let jsonDecoder = JSONDecoder()
// –––––– Mapping from specific paths to models ––––––
// These all use Swift 4’s JSONDecoder, but you can configure arbitrary transforms on arbitrary data types.
configureTransformer("rest/user/") {
// Input type inferred because the from: param takes Data.
// Output type inferred because jsonDecoder.decode() will return User
try jsonDecoder.decode(User.self, from: $0.content)
}
// MARK: - Resources
var userResource: Siesta.Resource { return resource("rest/user/") }
}
Finally, we can implement our resource inside our ViewController:
class UserViewController: UIViewController {
#IBOutlet weak var nameLabel: UILabel!
#IBOutlet weak var emailLabel: UILabel!!
override func viewDidLoad() {
super.viewDidLoad()
myAPI.userResource
.addObserver(self)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
myAPI.userResource.loadIfNeeded()
}
}
extension UserViewController: ResourceObserver {
func resourceChanged(_ resource: Resource, event: ResourceEvent) {
let user: User? = resource.typedContent()
nameLabel.text = user?.name
emailLabel.text = user?.email
}
}
Note: Siesta is very flexible and customisable framework, you can find multiple ways to configure your services and resources. This is just one simple way to implement what you are asking for.
To make a POST request with params you can do something like this inside your Service class:
Implement an update method that makes the POST request.
func update(user: User, newName: String) -> Siesta.Request {
return usersResource
.child(user.id)
.child("update")
.request(.post, json: ["name": newName])
}
Then, in your ViewController you can call the method to submit the POST request and evaluate its response:
myAPI.update(user: user, newName: "NEW NAME")
.onSuccess({ (_) in
print("Successfully updated user's name.")
})
.onFailure({ (error) in
print("Error trying to update user's name.")
})
Here is my code that is returning a false instead of the json array count.
I must comment that at one point it was working and then it stopped. Please help.
let task = NSURLSession.sharedSession().dataTaskWithURL(url!, completionHandler: { (data, response, error) -> Void in
let urlError = false
if error == nil {
let urlContent = NSString(data: data!, encoding: NSUTF8StringEncoding) as NSString!
let data: NSData = urlContent.dataUsingEncoding(NSUTF8StringEncoding)!
print("data here\(data)”) // I see a lot of data in the logs with this print
do {
let jsonObject = try (NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers) as? NSArray)!
print(“here is the array count\(jsonObject.count)”) // it never prints this to the logs. What I get is “false"
…The rest of the code...
I'm hoping someone may be able to help me figure out a snafu I'm having with an app I am trying to write (or learn to write) in Swift 2.0. This previously worked in Swift 1.2, but after the necessary conversions, I am continunally facing the error;
Cannot invoke initializer of type 'NSData' with an argument list of type '(contenOfURL: NSURL, options: NSDataReadingOptions, error:nil)'
Here is my code, slightly truncated, that I am using;
...
class func fetchMinionData() -> [Minion] {
let myURL = "https://myurl/test.json"
let dataURL = NSURL(string: myURL)
let data = NSData(contentsOfURL: dataURL!, options: NSDataReadingOptions.DataReadingMappedIfSafe, error: nil)
//THIS IS THE LINE THAT THROWS THE ERROR
let minionJSON = JSON(data)
var minions = [Minion]()
for (_ , minionDictionary) in minionJSON {
minions.append(Minion(minionDetails: minionDictionary))
}
return minions
}
...
Note that I plan to use the SwiftyJSON library to further parse the data once it is downloaded. I am searching endlessly online, but I just can't seem to figure this out! Thank you!
If you are working with Swift 2, you should not pass the last argument "error". Instead put a try around the NSData initialization. If data needs to be accessed outside take the init result in a var and convert to let Modified code
var optData:NSData? = nil
do {
optData = try NSData(contentsOfURL: dataURL!, options: NSDataReadingOptions.DataReadingMappedIfSafe)
}
catch {
print("Handle \(error) here")
}
if let data = optData {
// Convert data to JSON here
}
Example code for Dictionary :) Swift 2.0
https://github.com/DaRkD0G/LoadExtension/edit/master/LoadExtensionDictionary.swift
enum EHError: ErrorType {
case Nil(String)
case NSData(String)
case JSON(String)
}
extension Dictionary {
/**
Loads a JSON file from the app bundle into a new dictionary
- parameter filename: File name
- throws: PathForResource / NSData / JSON
- returns: Dictionary<String, AnyObject>
*/
static func loadJSONFromBundle(filename: String) throws -> Dictionary<String, AnyObject> {
guard let path = NSBundle.mainBundle().pathForResource(filename, ofType: "json") else {
throw EHError.Nil("[EasyHelper][loadJSONFromBundle][->pathForResource] The file could not be located\nFile : '\(filename).json'")
}
guard let data = try? NSData(contentsOfFile: path, options:NSDataReadingOptions()) else {
throw EHError.NSData("[EasyHelper][loadJSONFromBundle][->NSData] The absolute path of the file not find\nFile : '\(filename)'")
}
guard let jsonDict = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions()) as? Dictionary<String, AnyObject> else {
throw EHError.JSON("[EasyHelper][loadJSONFromBundle][->NSJSONSerialization]Error.InvalidJSON Level file '\(filename)' is not valid JSON")
}
return jsonDict
}
}
If I do not do a mistake, for you is that
/**
Loads a JSON file from the app bundle into a new dictionary
- parameter filename: File name
- throws: EHError : PathForResource / NSData / JSON
- returns: [String : AnyObject]
*/
static func loadJSONFromBundle(filename: String, nameJson:String) throws -> [String : AnyObject] {
guard let path = NSBundle.mainBundle().pathForResource(filename, ofType: "json") else {
throw EHError.Nil("[EasyHelper][loadJSONFromBundle][->pathForResource] The file could not be located\nFile : '\(filename).json'")
}
guard let data = try? NSData(contentsOfFile: path, options:NSDataReadingOptions()) else {
throw EHError.NSData("[EasyHelper][loadJSONFromBundle][->NSData] The absolute path of the file not find\nFile : '\(filename)'")
}
guard let jsonDict = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments) as? [String : AnyObject] else {
throw EHError.JSON("[EasyHelper][loadJSONFromBundle][->NSJSONSerialization] Invalid JSON\n nameJson '\(nameJson)'\nFile '\(filename)'")
}
return jsonDict
}