I am currently going through the processes of migrating swift 2.3 to 3 using the most updated Kinvey SDK (version 3.3.5). They have done a ton of updates since the 1x versions. My question is has anyone successfully been able to query on the PersistableKeyID field and pull multiple objects?
I use to be able to use the "loadObjects" function which would take an array of strings as an argument. This function has since been depreciated and replaced with find(byId). See below:
dataStore.find(byId: "only takes one") { uClass, error in
if let uClass = uClass {
//succeed
print("UClass: \(uClass)")
} else {
//fail
}
The issue is, it will only take a single string as an argument. I have attempted to use the query functionality, but I cannot get it to take the "_id" field as a parameter. Using the following code:
//Just statically creating the sectionID array for now. This will dynamically be created
testIDs = ["58668307206c11177e5ab0d4", "58668307206c11177e5ab0d4", "57ad00a505a2bb55632659c3"]
let sectionStore = DataStore<Section>.collection()
let sectionQuery = Query(format: "_id IN %#", testIDs)
sectionStore.find(sectionQuery) {sectionResult, error in
if let sectionResult = sectionResult {
self.sectionsTest = sectionResult
self.sectionCollectionView.reloadData()
} else{
//Error
}
}
I receive the error:
'Invalid property name', reason: 'Property '_id' not found in object of type 'Section'
Anyone have an idea on how to perform this now that "loadObjects" has been depreciated? There is no delivered "find(byIds)" that I could find.
Jbone107,
I was able to get results with this, let me know if the below works for you.
let id:[String] = ["5855026650a816ec29012908","5855024a21400c5b492bea20"]
let query = Query(format: "_id IN %#", id)
dataStore.find(query) { data, error in
if let data = data {
//succeed
print(“Data: \(data)")
} else {
//fail
print("fetching failed")
}
}
Thanks,
Pranav,
Kinvey
Answered: Per the Data Store Guide for iOS, by default the ".collection()" is of type "cache". The "Cache" type will store data locally. This must be why "Realm" is now included with the version 3x SDK.
I updated my DataStore collection to:
let sectionStore = DataStore<Section>.collection(.network)
I added ".network" to force the query to pull from the backend rather than the cache file. This actually identified "_id" as a property and the query worked successfully. For some reason the "cache" file isn't storing this as a property.
Additional SDK Question Answered
I was having an issue pulling NSNumber from the Kinvey backend. This ended up being a similar issue related to the "cache" query. I reviewed the Realm support site as a last resort effort to try and figure this out. I found that Realm doesn't actually support type "NSNumber".
Excerpt taken from: https://realm.io/docs/swift/latest/
Realm supports the following property types: Bool, Int8, Int16, Int32, Int64, Double, Float, String, NSDate, and NSData.
Unfortunately, Kinvey doesn't support "Int" types. As a work around, I have changed them to string and am just converting back to "Double" or another type after I pull the data. However, if I just use ".network" collection types, then NSNumber still works.
Thanks,
James
Related
This question already has answers here:
Returning data from async call in Swift function
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I am building a mobile app with swift, and am having some syntax issues as I am not a developer. The structure and logic of the application is really rough and surely incorrect, however we just need something that functions. (It is a school project and my team got no devs).
Anyways, we have a MySQL database that will be used as a middleman between our badge server/admin app, and our mobile app. Currently when you go to https://gatekeeperapp.org/service.php , you will see the current database data, taken by a php script and hosted there as JSON. Currently in Swift I have a struct with a function that takes this JSON data, and maps it to variables. The idea is to then pass these pulled variables into a separate set of functions that will check the pulled long/lat against the mobile devices location, and then return whether they match or not. This value would be updated, re-encoded to JSON, and pushed to a web service that would go about changing the values in the database so the badge server could use them.
Where I am currently I can see that values are being pulled and mapped and I can set a variable in a separate function to the pulled value, but then I can only seem to output this value internally, rather than actually use it in the function. I get a type error saying that the pulled values are of type (). How can I properly use these values? Ultimately I think I would want to convert the () to a double, so I could properly compare it to the Long/Lat of the device, and then will need to re-encode the new values to JSON.
Swift Code -- struct function
Swift code -- JSON struct
Swift code -- using pulled data
Your closure is called asynchronously, which means that the outer function where you are expecting to use the values has already returned by the time the closure is called. Instead, you probably need to call some other function from the closure, passing the values you've received.
class MyClass {
func fetchUserData() {
UserData().fetchUser { [weak self] user, error in
DispatchQueue.main.async {
if let user = user {
self?.handleSuccess(userID: user)
} else if let error = error {
self?.handleError(error)
}
}
}
}
private func handleSuccess(userID: String) {
print(userID)
// Do something with userID. Maybe assign it to a property on the class?
}
private func handleError(_ error: Error) {
print(error)
// Handle the error. Maybe show an alert?
}
}
I am trying to add Apple Pencil support to my mind mapping app. I already use Core Data within my app for data persistence which all works fine without any bugs.
I have my Apple Pencil features working fine but I'm having trouble storing the Apple Pencil data.
Ive tried to add a PKDrawing object to my MindMap data model but I keep getting a compile time error 'cannot find type 'PKDrawing' in scope'
As far as I am away I can store the PKDrawing object into core data and then fetch it back out when the app loads. But I'm obviously not doing something right.
Any help is greatly appreciated folks.
Thank you
Update:
So I've used:
func convertToData(pkdrawing: PKDrawing) -> Data {
let data = pkdrawing.dataRepresentation()
return data
}
Then updated my model data and savedContext which all seems to work ok. The problem is when I try and initialise the data on opening the app. I have:
func createDrawing(data: Data) -> PKDrawing {
var loadedDrawing: PKDrawing
do {
try loadedDrawing = PKDrawing.init(from: data as! Decoder)
return loadedDrawing
} catch {
print("Error loading drawing object")
return PKDrawing()
}
}
which gives me error:
Could not cast value of type 'Foundation.Data' (0x1f3851a98) to 'Swift.Decoder' (0x1ee5381a8).
2021-09-24 06:22:58.912173+0100 MindMappingApp[1137:612856] Could not cast value of type 'Foundation.Data' (0x1f3851a98) to 'Swift.Decoder' (0x1ee5381a8).
I tried:
try loadedDrawing = PKDrawing.init(from: data as! Decoder)
as:
try loadedDrawing = PKDrawing.init(from: data)
but I kept getting:
Argument type 'Data' does not conform to expected type 'Decoder'
any ideas? Thanks in advance :)
Instead of trying to store the PKDrawing directly, store the Data associated with it instead.
Your Core Data model will have a field with the type Data (or Binary Data if you're using the GUI).
When you need to actually use that data and covert to/from the PKDrawing, you can use:
init(data:) https://developer.apple.com/documentation/pencilkit/pkdrawing/3281882-init
dataRepresentation() https://developer.apple.com/documentation/pencilkit/pkdrawing/3281878-datarepresentation
I try to create a function for querying the Facebook database. Unfortunately, the syntax changed with the last version of swift. Maybe someone can post me the solution ?
Thx.
Func donneesFB
It's a lot easier to help you if you post your code as text instead of in an image.
Two things that will likely help you out here:
First, cast your result to the type of dictionary you are expecting before trying to access it:
guard let resultDict = result as? [String:Any] else { return }
You should now be able to use it like you tried to:
let nom = resultDict["name"] as? String
Secondly, for the error on your first line, simply get rid of the argument labels, nom, prenom and so on, leaving just the types.
I am currently in the process of writing an iOS APP that downloads information from an API in JSON format then displays it in the app.
One of the key features to this app is it being able to work offline as well as online, for this reason there should be a cached version as well as an online version.
After reading through the internet to my shock I have not found any examples what so ever of this approach.
The only thing I have found that's even come close to this is HanekeSwift but the documentation seems incomplete and there is no way to clear the cache and i'm not even sure if this is a memory based cache or a filesystem based cache.
Since there is lots of ways out there to do this, core data, file system frameworks etc.. I'm not sure which one would be the best to go for, theoretically to break down my thought process all I need to do is:
Check if the JSON file exists on the system
If not download it from the network and store it for later use (Preferably as a string format)
If file exists load it into a swiftyJSON object
I feel like core data would be overkill, I feel like the file system way is dated as most of the filesystem cocoa pods/libraries don't seem to be compatible with the current swift version (2.3)
Can anyone share some light on what the generic standard way of doing this is or what option would be the most suitable for my purpose of use and why.
Kindest regards
SwiftifyJSON makes objects that support archiving.
Try this
class HSCache: NSObject {
static var defaults: NSUserDefaults = NSUserDefaults()
class func cacheThis(key: String, object : AnyObject) {
defaults.setObject(NSKeyedArchiver.archivedDataWithRootObject(object), forKey: key)
defaults.synchronize()
}
class func getFromCache(key: String, type : AnyClass) -> AnyClass? {
if defaults.objectForKey(key) != nil {
return NSKeyedUnarchiver.unarchiveObjectWithData(defaults.objectForKey(key) as! NSData) as? AnyClass
}
return nil
}
class func deleteFromCache(key: String) {
defaults.removeObjectForKey(key)
defaults.synchronize()
}
}
Just trying to update some Core Data apps with Continuity and have run into a bit of an issue with using the selected objects ID in the userInfo dictionary to display the correct data on the continuing device.
My first thought was to use the ObjectID, however on the receiving device this would never find a corresponding object in the Core Data store.
As it turns out the URL representation of the objectID contains the UUID of the store itself, and because the two stores UUID's are different this is obviously going to fail.
So I guess I could replace the Core Data store's UUID in the URL with the continuing devices UUID and use this, and no doubt it would work.
The Url seems to be of the following format
Does anyone know what the correct way would be to pass a reference to an object between two devices with core data stores that are synchronised via iCloud?
I'll answer this one myself and see if there are any better answers...
I pass the url of the objectID (from objectID.URIRepresentation) using Continuity API and on the receiving device create a new URL using the following:
url is the url passed in the NSUserActivity.userInfo dictionary
let storeUUID = self.identifierForStore()
// Switch the host component to be the local storeUUID
let newURL = NSURL(scheme: url.scheme!, host: storeUUID, path: url.path!)
func identifierForStore()->NSString? {
if let store = self.persistentStoreCoordinator?.persistentStores[0] as? NSPersistentStore {
return store.identifier
} else {
return nil
}
}
This seems to work just fine - hope it helps someone