as per the documentation, it should be pretty straightforward. example for a List: https://developer.apple.com/documentation/swiftui/list/ondrop(of:istargeted:perform:)-75hvy#
the UTType should be the parameter restricting what a SwiftUI object can receive. in my case i want to accept only Apps. the UTType is .applicationBundle: https://developer.apple.com/documentation/uniformtypeidentifiers/uttype/3551459-applicationbundle
but it doesn't work. the SwiftUI object never changes status and never accepts the drop. the closure is never run. whether on Lists, H/VStacks, Buttons, whatever. the pdf type don't seem to work either, as well as many others. the only type that i'm able to use if fileURL, which is mainly like no restriction.
i'm not sure if i'm doing something wrong or if SwiftUI is half working for the mac.
here's the code:
List(appsToIgnore, id: \.self, selection: $selection) {
Text($0)
}
.onDrop(of: [.applicationBundle, .application], isTargeted: isTargeted) { providers in
print("hehe")
return true
}
replacing or just adding .fileURL in the UTType array makes the drop work but without any type restriction.
i've also tried to use .onInsert on a ForEach instead (https://developer.apple.com/documentation/swiftui/foreach/oninsert(of:perform:)-2whxl#), and to go through a proper DropDelegate (https://developer.apple.com/documentation/swiftui/dropdelegate#) but keep getting the same results. it would seem the SwiftUI drop for macOS is not yet working, but i can't find any official information about this. in the docs it is written macOS 11.0+ so i would expect it to work?
any info appreciated! thanks.
You need to validate manually, using DropDelegate of what kind of file is dragged over.
Here is a simplified demo of possible approach. Tested with Xcode 13 / macOS 11.6
let delegate = MyDelegate()
...
List(appsToIgnore, id: \.self, selection: $selection) {
Text($0)
}
.onDrop(of: [.fileURL], delegate: delegate) // << accept file URLs
and verification part like
class MyDelegate: DropDelegate {
func validateDrop(info: DropInfo) -> Bool {
// find provider with file URL
guard info.hasItemsConforming(to: [.fileURL]) else { return false }
guard let provider = info.itemProviders(for: [.fileURL]).first else { return false }
var result = false
if provider.canLoadObject(ofClass: String.self) {
let group = DispatchGroup()
group.enter() // << make decoding sync
// decode URL from item provider
_ = provider.loadObject(ofClass: String.self) { value, _ in
defer { group.leave() }
guard let fileURL = value, let url = URL(string: fileURL) else { return }
// verify type of content by URL
let flag = try? url.resourceValues(forKeys: [.contentTypeKey]).contentType == .applicationBundle
result = flag ?? false
}
// wait a bit for verification result
_ = group.wait(timeout: .now() + 0.5)
}
return result
}
func performDrop(info: DropInfo) -> Bool {
// handling code is here
return true
}
}
// View controller call
viewModel.bindNotificationReadEvents(readNotificationID: readNotificationIDPublisher.asDriver(onErrorDriveWith: .empty()))
viewModel.reloadDataSourceForNotificationReadEvent.drive(reloadDataSourceForNotificationReadEventBinder).disposed(by: rx.disposeBag)
// View model
var reloadDataSourceForNotificationReadEvent: Driver<[NotificationItem]> = .empty()
fileprivate let dataSourceRelay = BehaviorRelay<[NotificationItem]>(value: [])
public func bindNotificationReadEvents(readNotificationID: Driver<String>) {
readNotificationID.drive(onNext: { [weak self] notificationID in
// read notification IDs on User Defaults
UserDefaults.main?.unreadNotificationIDs.append(notificationID)
// Update data source relay
self?.reloadDataSourceForNotificationReadEvent = readNotificationID.withLatestFrom(self?.dataSourceRelay.asDriver() ?? .empty())
}).disposed(by: rx.disposeBag)
}
when this method is called from the viewcontroller in the viewmodel it just skips both the lines and nothing executes when i checked it while debugging neither is the userdefaults updated nor is data source relay can someone please help me out.
My app reports and records location, altitude, rotation and accelerometer data (DeviceMotion) while in the background. This works fine on ios 10.3.3. On IOS 11, I no longer have access motion data while the device is locked. Altitude data and location data is still streaming to the console, though.
Has something changed in IOS 11 that prevents me from accessing motion data or am I doing trying to access it in a way that Apple now blocks like OperationQueue.main
Here is how I'm starting motion updates. If the phone is unlocked, all works fine. If I locking the phone, no more updates.:
let motionManager = self.motionManager
if motionManager.isDeviceMotionAvailable {
motionUpdateInterval = 0.15
motionManager.deviceMotionUpdateInterval = motionUpdateInterval
motionManager.startDeviceMotionUpdates(using: .xArbitraryZVertical, to: OperationQueue.main) {deviceMotion, error in
guard let deviceMotion = deviceMotion else { return }
I can't find anything about Motion background modes changing but it seems there must be a way otherwise RunKeeper, Strava will break. Can someone help me get this working again before IOS11 launch?
Thanks!
Also came across this problem.
Our solution was to ensure we have another background mode enabled and running (in our case location updates + audio) and restart core motion updates when switching background/foreground.
Code sample:
import UIKit
import CoreMotion
final class MotionDetector {
private let motionManager = CMMotionManager()
private let opQueue: OperationQueue = {
let o = OperationQueue()
o.name = "core-motion-updates"
return o
}()
private var shouldRestartMotionUpdates = false
init() {
NotificationCenter.default.addObserver(self,
selector: #selector(appDidEnterBackground),
name: .UIApplicationDidEnterBackground,
object: nil)
NotificationCenter.default.addObserver(self,
selector: #selector(appDidBecomeActive),
name: .UIApplicationDidBecomeActive,
object: nil)
}
deinit {
NotificationCenter.default.removeObserver(self,
name: .UIApplicationDidEnterBackground,
object: nil)
NotificationCenter.default.removeObserver(self,
name: .UIApplicationDidBecomeActive,
object: nil)
}
func start() {
self.shouldRestartMotionUpdates = true
self.restartMotionUpdates()
}
func stop() {
self.shouldRestartMotionUpdates = false
self.motionManager.stopDeviceMotionUpdates()
}
#objc private func appDidEnterBackground() {
self.restartMotionUpdates()
}
#objc private func appDidBecomeActive() {
self.restartMotionUpdates()
}
private func restartMotionUpdates() {
guard self.shouldRestartMotionUpdates else { return }
self.motionManager.stopDeviceMotionUpdates()
self.motionManager.startDeviceMotionUpdates(using: .xArbitraryZVertical, to: self.opQueue) { deviceMotion, error in
guard let deviceMotion = deviceMotion else { return }
print(deviceMotion)
}
}
}
The official 11.1 release fixed the issue and I've heard from iPhone 8 users that the original implementation is working for them.
The 11.2 beta has not broken anything.
I'm exploring tvOS and I found that Apple offers nice set of templates written using TVML. I'd like to know if a tvOS app that utilises TVML templates can also use UIKit.
Can I mix UIKit and TVMLKit within one app?
I found a thread on Apple Developer Forum but it does not fully answer this question and I am going through documentation to find an answer.
Yes, you can. Displaying TVML templates requires you to use an object that controls the JavaScript Context: TVApplicationController.
var appController: TVApplicationController?
This object has a UINavigationController property associated with it. So whenever you see fit, you can call:
let myViewController = UIViewController()
self.appController?.navigationController.pushViewController(myViewController, animated: true)
This allows you to push a Custom UIKit viewcontroller onto the navigation stack. If you want to go back to TVML Templates, just pop the viewController off of the navigation stack.
If what you would like to know is how to communicate between JavaScript and Swift, here is a method that creates a javascript function called pushMyView()
func createPushMyView(){
//allows us to access the javascript context
appController?.evaluateInJavaScriptContext({(evaluation: JSContext) -> Void in
//this is the block that will be called when javascript calls pushMyView()
let pushMyViewBlock : #convention(block) () -> Void = {
() -> Void in
//pushes a UIKit view controller onto the navigation stack
let myViewController = UIViewController()
self.appController?.navigationController.pushViewController(myViewController, animated: true)
}
//this creates a function in the javascript context called "pushMyView".
//calling pushMyView() in javascript will call the block we created above.
evaluation.setObject(unsafeBitCast(pushMyViewBlock, AnyObject.self), forKeyedSubscript: "pushMyView")
}, completion: {(Bool) -> Void in
//done running the script
})
}
Once you call createPushMyView() in Swift, you are free to call pushMyView() in your javascript code and it will push a view controller onto the stack.
SWIFT 4.1 UPDATE
Just a few simple changes to method names and casting:
appController?.evaluate(inJavaScriptContext: {(evaluation: JSContext) -> Void in
and
evaluation.setObject(unsafeBitCast(pushMyViewBlock, to: AnyObject.self), forKeyedSubscript: "pushMyView" as NSString)
As mentioned in the accepted answer, you can call pretty much any Swift function from within the JavaScript context. Note that, as the name implies, setObject:forKeyedSubscript: will also accept objects (if they conform to a protocol that inherits from JSExport) in addition to blocks, allowing you to access methods and properties on that object. Here's an example
import Foundation
import TVMLKit
// Just an example, use sessionStorage/localStorage JS object to actually accomplish something like this
#objc protocol JSBridgeProtocol : JSExport {
func setValue(value: AnyObject?, forKey key: String)
func valueForKey(key: String) -> AnyObject?
}
class JSBridge: NSObject, JSBridgeProtocol {
var storage: Dictionary<String, String> = [:]
override func setValue(value: AnyObject?, forKey key: String) {
storage[key] = String(value)
}
override func valueForKey(key: String) -> AnyObject? {
return storage[key]
}
}
Then in your app controller:
func appController(appController: TVApplicationController, evaluateAppJavaScriptInContext jsContext: JSContext) {
let bridge:JSBridge = JSBridge();
jsContext.setObject(bridge, forKeyedSubscript:"bridge");
}
Then you can do this in your JS: bridge.setValue(['foo', 'bar'], "baz")
Not only that, but you can override views for existing elements, or define custom elements to use in your markup, and back them with native views:
// Call lines like these before you instantiate your TVApplicationController
TVInterfaceFactory.sharedInterfaceFactory().extendedInterfaceCreator = CustomInterfaceFactory()
// optionally register a custom element. You could use this in your markup as <loadingIndicator></loadingIndicator> or <loadingIndicator /> with optional attributes. LoadingIndicatorElement needs to be a TVViewElement subclass, and there are three functions you can optionally override to trigger JS events or DOM updates
TVElementFactory.registerViewElementClass(LoadingIndicatorElement.self, forElementName: "loadingIndicator")
Quick custom element example:
import Foundation
import TVMLKit
class LoadingIndicatorElement: TVViewElement {
override var elementName: String {
return "loadingIndicator"
}
internal override func resetProperty(resettableProperty: TVElementResettableProperty) {
super.resetProperty(resettableProperty)
}
// API's to dispatch events to JavaScript
internal override func dispatchEventOfType(type: TVElementEventType, canBubble: Bool, cancellable isCancellable: Bool, extraInfo: [String : AnyObject]?, completion: ((Bool, Bool) -> Void)?) {
//super.dispatchEventOfType(type, canBubble: canBubble, cancellable: isCancellable, extraInfo: extraInfo, completion: completion)
}
internal override func dispatchEventWithName(eventName: String, canBubble: Bool, cancellable isCancellable: Bool, extraInfo: [String : AnyObject]?, completion: ((Bool, Bool) -> Void)?) {
//...
}
}
And here's how to set up a custom interface factory:
class CustomInterfaceFactory: TVInterfaceFactory {
let kCustomViewTag = 97142 // unlikely to collide
override func viewForElement(element: TVViewElement, existingView: UIView?) -> UIView? {
if (element.elementName == "title") {
if (existingView != nil) {
return existingView
}
let textElement = (element as! TVTextElement)
if (textElement.attributedText!.length > 0) {
let label = UILabel()
// Configure your label here (this is a good way to set a custom font, for example)...
// You can examine textElement.style or textElement.textStyle to get the element's style properties
label.backgroundColor = UIColor.redColor()
let existingText = NSMutableAttributedString(attributedString: textElement.attributedText!)
label.text = existingText.string
return label
}
} else if element.elementName == "loadingIndicator" {
if (existingView != nil && existingView!.tag == kCustomViewTag) {
return existingView
}
let view = UIImageView(image: UIImage(named: "loading.png"))
return view // Simple example. You could easily use your own UIView subclass
}
return nil // Don't call super, return nil when you don't want to override anything...
}
// Use either this or viewForElement for a given element, not both
override func viewControllerForElement(element: TVViewElement, existingViewController: UIViewController?) -> UIViewController? {
if (element.elementName == "whatever") {
let whateverStoryboard = UIStoryboard(name: "Whatever", bundle: nil)
let viewController = whateverStoryboard.instantiateInitialViewController()
return viewController
}
return nil
}
// Use this to return a valid asset URL for resource:// links for badge/img src (not necessary if the referenced file is included in your bundle)
// I believe you could use this to cache online resources (by replacing resource:// with http(s):// if a corresponding file doesn't exist (then starting an async download/save of the resource before returning the modified URL). Just return a file url for the version on disk if you've already cached it.
override func URLForResource(resourceName: String) -> NSURL? {
return nil
}
}
Unfortunately, view/viewControllerForElement: will not be called for all elements. Some of the existing elements (like collection views) will handle the rendering of their child elements themselves, without involving your interface factory, which means you'll have to override a higher level element, or maybe use a category/swizzling or UIAppearance to get the effect you want.
Finally, as I just implied, you can use UIAppearance to change the way certain built-in views look. Here's the easiest way to change the appearance of your TVML app's tab bar, for example:
// in didFinishLaunching...
UITabBar.appearance().backgroundImage = UIImage()
UITabBar.appearance().backgroundColor = UIColor(white: 0.5, alpha: 1.0)
If you already have a native UIKit app for tvOS, but would like to extend it by using TVMLKit for some part of it, You can.
Use the TVMLKit as a sub app in your native tvOS app. The following app shows how to do this, by retaining the TVApplicationController and present the navigationController from the TVApplicationController. The TVApplicationControllerContext is used to transfer data to the JavaScript app, as the url is transferred here :
class ViewController: UIViewController, TVApplicationControllerDelegate {
// Retain the applicationController
var appController:TVApplicationController?
static let tvBaseURL = "http://localhost:9001/"
static let tvBootURL = "\(ViewController.tvBaseURL)/application.js"
#IBAction func buttonPressed(_ sender: UIButton) {
print("button")
// Use TVMLKit to handle interface
// Get the JS context and send it the url to use in the JS app
let hostedContContext = TVApplicationControllerContext()
if let url = URL(string: ViewController.tvBootURL) {
hostedContContext.javaScriptApplicationURL = url
}
// Save an instance to a new Sub application, the controller already knows what window we are running so pass nil
appController = TVApplicationController(context: hostedContContext, window: nil, delegate: self)
// Get the navigationController of the Sub App and present it
let navc = appController!.navigationController
present(navc, animated: true, completion: nil)
}
Yes. See the TVMLKit Framework, whose docs start with:
The TVMLKit framework enables you to incorporate JavaScript and TVML files in your binary apps to create client-server apps.
From a quick skim of those docs, it looks like you use the various TVWhateverFactory classes to create UIKit views or view controllers from TVML, after which you can insert them into a UIKit app.
I use Alamofire for networking in my iOS application. I need to run this app in iOS 7+. I want to indicate network activity in status bar, so I created this struct:
struct ActivityManager {
static var activitiesCount = 0
static func addActivity() {
if activitiesCount == 0 {
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}
activitiesCount++
}
static func removeActivity() {
if activitiesCount > 0 {
activitiesCount--
if activitiesCount == 0 {
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}
}
}
}
But I don't know, where to call in code addActivity() and removeActivity() methods. I don't want to write them with every request. I want to, that they will be called automatically with every request.
I tried also use pure NSURLSession and NSURLSessionTask and extend them:
extension NSURLSessionTask {
func resumeWithActivity() {
ActivityManager.addAction()
self.resume()
}
}
public extension NSURLSession {
func OwnDataTaskWithRequest(request: NSURLRequest!, ownCompletionHandler: ((NSData!, NSURLResponse!, NSError!) -> Void)?) -> NSURLSessionDataTask! {
return self.dataTaskWithRequest(request, completionHandler: { (data, response, error) in
ActivityManager.removeAction()
ownCompletionHandler!(data, response, error)
})
}
}
Then I used them like this:
var session: NSURLSession = NSURLSession(configuration: config, delegate: self, delegateQueue: nil)
session.OwnDataTaskWithRequest(request) { (data, response, error) -> Void in
// some logic here
}.resumeWithActivity()
But this approach doesn't work. In iOS 7 is NSURLSession extension not visible. I created a bug report for this (with sample project).
Can you please give me some advise, how to reach my goal? With or without Alamofire?
If you don't want to call your functions manually for every request and that you want to use Alamofire, I suggest you to improve it to add the network activity indicator feature.
Have a look at the source of Alamofire
You need to register 2 notification observers in your ActivityManager and then trigger the notifications at the relevant places either in Alamofire.Manager or in Alamofire.Request.
Also have a look at the source of AFNetworkActivityIndicatorManager which implement the feature you want in AFNetworking.