In my ViewController.swift I have this method which presents a viewcontroller modally after the animations for the boxes are completed:
#objc func sceneTapped(recognizer: UITapGestureRecognizer) {
let location = recognizer.location(in: sceneView)
let hitResults = sceneView.hitTest(location, options: nil)
if hitResults.count > 0 {
let result = hitResults[0]
let box = result.node
let fadeAction = SCNAction.fadeOut(duration: 1.0)
let rotateAction = SCNAction.rotate(by: CGFloat(Double.pi*2), around: SCNVector3(x: 0.5, y: 1.5, z: 0), duration: 1.0)
let groupActions = SCNAction.group([rotateAction, fadeAction])
if box.name == Present.left.rawValue || box.name == Present.middle.rawValue || box.name == Present.right.rawValue {
box.runAction(groupActions, completionHandler: presentWebView)
}
}
}
presentWebView uses the storyboard to instantiate the viewcontroller:
func presentWebView(){
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "webViewController")
self.present(vc, animated: true, completion: nil)
}
But every time the app crashes on self.present(vc, animated: true, completion: nil) with EXC_BREAKPOINT (code=1, subcode=0x1a1579b50)
HOWEVER, when I don't present the view controller in the completion hander, i.e.:
#objc func sceneTapped(recognizer: UITapGestureRecognizer) {
presentWebView()
}
This works completely fine
So I don't understand why presenting a view controller in a completion handler causes a crash.
Any help would be greatly appreciated!
the SCNAction completion handler will not be called in the main thread.
Per UIKit guidelines your UI code needs to run on the main thread. You should be able to do that using DispatchQueue.main.async { ... }
Related
var images : [UIImage?] = [nil, nil, nil, nil, nil]
I have image array. I want to replace nil to image by button sender.tag
#IBAction func addImage(_ sender: UIButton) {
var configuration = PHPickerConfiguration()
configuration.selectionLimit = 1
configuration.filter = .any(of: [.images])
let picker = PHPickerViewController(configuration: configuration)
picker.delegate = self
self.present(picker, animated: true, completion: nil)
If array[index] is nil, show + image.
But array[index] is a photo, show photo
extension EditViewController: PHPickerViewControllerDelegate {
#available(iOS 14, *)
func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
picker.dismiss(animated: true, completion: nil)
let itemProvider = results.first?.itemProvider
if let itemProvider = itemProvider,
itemProvider.canLoadObject(ofClass: UIImage.self) {
itemProvider.loadObject(ofClass: UIImage.self) { (object, error) in
if let image = object as? UIImage {
DispatchQueue.main.async {
print("image: \(image)")
print("IMAGES ARRAY : \(self.images)")
}
}
}
} else {
//
}
}
}
This code is PHPicerViewControllerDelegate (https://ikyle.me/blog/2020/phpickerviewcontroller)
you can do this with following method
assign tags to your UIButtons and on UIButton action add your image on specific index of array by managing an object
e.g
var selectedIndex or selectedTag // of your UIButton
on Button click update your selectedIndex value with
self.selectedIndex = sender.tag
then in your didFinishPicking method update your images array with selected image on selectedIndex and update your buttons images with following way
images.insert(yourSelectedImage, at: selectedIndex)
self.setImagesForButtons()
now assign your selected image to UIButton using UIButton Outlet
e.g you have five outlets for your five buttons
#IBOutlet weak var yourButtonOutlet1: UIButton!
#IBOutlet weak var yourButtonOutlet2: UIButton!
#IBOutlet weak var yourButtonOutlet3: UIButton!
#IBOutlet weak var yourButtonOutlet4: UIButton!
#IBOutlet weak var yourButtonOutlet5: UIButton!
func setImagesForButtons()
{
if (self.selectedIndex == 0)
{
if (images[selectedIndex] != nil)
{
self.yourButtonOutlet1.setImage(images[selectedIndex], for: .normal)
}
else
{
// set plus icon image to your button
}
}
else if (self.selectedIndex == 1)
{
if (images[selectedIndex] != nil)
{
self.yourButtonOutlet2.setImage(images[selectedIndex], for: .normal)
}
else
{
// set plus icon image to your button
}
}
else if (self.selectedIndex == 2)
{
if (images[selectedIndex] != nil)
{
self.yourButtonOutlet3.setImage(images[selectedIndex], for: .normal)
}
else
{
// set plus icon image to your button
}
}
else if (self.selectedIndex == 3)
{
if (images[selectedIndex] != nil)
{
self.yourButtonOutlet4.setImage(images[selectedIndex], for: .normal)
}
else
{
// set plus icon image to your button
}
}
else if (self.selectedIndex == 4)
{
if (images[selectedIndex] != nil)
{
self.yourButtonOutlet5.setImage(images[selectedIndex], for: .normal)
}
else
{
// set plus icon image to your button
}
}
}
You can use in build Image Picker
extension EditProfileViewController: UIImagePickerControllerDelegate,UINavigationControllerDelegate {
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
// localUserData.ProfileImage = info[.originalImage] as? UIImage
self.imgProfile.image = info[.originalImage] as? UIImage
self.dismiss(animated: true, completion: {
let yes = UIAlertAction(title: "Yes", style: .default, handler: { _ in
self.imgProfile.image = self.localUserData.ProfileImage
})
let no = UIAlertAction(title: "No", style: .default, handler: nil)
self.showCustomAlert(alertMsg: ValidationMsg.imageUpload.rawValue, actions: [yes,no])
})
}
}
The correct answer was given, just want to make it shorter.
The every button should have a tag, from 0 to 4.
Then you can create a property in your controller. Let it be selectedIndex. In the addImage you should add the line:
#IBAction func addImage(_ sender: UIButton) {
self.selectedIndex = _sender.tag
....
}
Then in the delegate method after you got an image:
images[selectedIndex] = image
let buttons = [button1, button2, button3, button4, button5]
let selectedButton = buttons[selectedIndex]
if (images[selectedIndex] != nil) {
selectedButton.setImage(images[selectedIndex], for: .normal)
}
else {
selectedButton.setImage(imagePlus, for: .normal)
}
Currently I am attempting to push values into an array of note objects from firebase
The only issue is due to Firebases asynchronous nature, I am having trouble getting the main thread to wait until the fetch function is completed. I have viewed many answers on this site and I have read up on the Semaphores and Dispatch queue documentation however I cannot get this fetch to work. It appears that most of the people here are attempting to use a table view which I am not.
Here is the fetch code
func fetchUser(){
FIRDatabase.database().reference().child("notes").observe(.childAdded, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject] {
let user = noteClass(dictionary: dictionary)
self.coordinotes.append(user)
}
}, withCancel: nil)
}
I have removed all of my semaphore and dispatch main attempts due to none of them working. This function is called in my view did load. When i check the values of my array that i push them into 'coordinotes' the value is not yet placed in and i get an out of bounds error.
Rest of code
import UIKit
import MapKit
import CoreLocation
import Firebase
import FirebaseDatabase
struct PreferencesKeys{
static let savedItems = "savedItems"
}
class ViewController: UIViewController, CLLocationManagerDelegate{
let manager = CLLocationManager()
var coordinotes:[noteClass] = Array()
var latitude = Double()
var noteTime = noteBrain()
//Map
#IBOutlet weak var map: MKMapView!
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
let location = locations[0]
let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, noteTime.span)
map.setRegion(region, animated: true)
self.map.showsUserLocation = true
}
override func viewDidLoad()
{
super.viewDidLoad()
navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Logout", style: .plain, target: self, action: #selector(handleLogout))
if FIRAuth.auth()?.currentUser?.uid == nil {
perform(#selector(handleLogout), with: nil, afterDelay: 0)
}
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
fetchUser()
loadAllCoordinotes()
}
func handleLogout() {
do {
try FIRAuth.auth()?.signOut()
} catch let logoutError {
print(logoutError)
}
let loginController = LoginController()
present(loginController, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func loadAllCoordinotes() {
let length = coordinotes.count - 1
map.addAnnotation(coordinotes[length])
}
func fetchUser(_ completion:#escaping ([noteClass] , _ success: Bool)-> Void){
let coordinotes = [noteClass]()
FIRDatabase.database().reference().child("notes").observe(.childAdded, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject] {
let user = noteClass(dictionary: dictionary)
coordinotes.append(user)
}
completion(coordinotes, true)
}, withCancel: nil)
}
and then you call it in viewDidLoad like this:
fetchUser { (coordinotes, success) in
if success {
self.coordinotes = coordinote
self.loadAllCoordinotes()
}
}
I have a scroll view that has an image view embedded into it. The user clicks the "Take Photo" button, takes a picture, and then those photos are stored in an array and then displayed on the scrollable imageView. My issue is that after the didFinishSelectingMedia is called and the camera closes, the imageView always shows the first image in the array. I want the imageView to show the most recent image added to the array and scroll backward through the images until the user comes to the first image in the array. How do I make this happen?
Btw: Idk if this is even plausible, but I tried reversing the for loop and that didn't work.
I'm a new programmer, so please explain your answers.
Here's my code:
import UIKit
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
#IBOutlet weak var scrollImageView: UIScrollView!
var imageTaken: [UIImage] = []
var imagePicker = UIImagePickerController()
override func viewDidLoad() {
super.viewDidLoad()
scrollImageView.frame = scrollImageView.frame
}
#IBAction func takePhotoButton(_ sender: Any) {
imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .camera
present(imagePicker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
imageTaken.append((info[.originalImage] as? UIImage)!)
imagePicker.dismiss(animated: true, completion: nil)
for i in 0..<imageTaken.count {
let imageView = UIImageView()
imageView.image = imageTaken[i]
imageView.contentMode = .scaleAspectFit
let xPosition = self.scrollImageView.frame.width * CGFloat(i)
imageView.frame = CGRect(x: xPosition, y: 0, width: self.scrollImageView.frame.width, height: self.scrollImageView.frame.height)
scrollImageView.contentSize.width = scrollImageView.frame.width * CGFloat(i + 1)
scrollImageView.addSubview(imageView)
}
}
}
Two options I guess you can take which ever one is seems easier.
OOP — Create an array of objects example:
struct TakePhotos {
var image : UIImage
var timestamp : Date
}
Then sort the array by the timestamp.
Use PHAsset
import Photos
Using PHAsset you should be able to retrieve the images taken from the user's album. Set a count when the user takes a new image.
Then you can run a query and sort the images in reverse order, they will already have the timestamp.
let photoOptions = PHFetchOptions()
photoOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
This is what I did in my application.
// FIXME: - Query only happens once this needs to be refactored so it happens when the album is updated on the device.
// Query only happens one time.
if imageArray.isEmpty {
let photoOptions = PHFetchOptions()
photoOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
let allPhotos = PHAsset.fetchAssets(with: photoOptions)
let fetchOptions = PHImageRequestOptions()
fetchOptions.deliveryMode = .highQualityFormat
fetchOptions.resizeMode = .exact
fetchOptions.normalizedCropRect = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.width)
// Must be a synchronous call otherwise the view loads before images are retrieved (result is an empty view).
fetchOptions.isSynchronous = true
let imageSize : CGSize = CGSize(width: view.frame.width, height: view.frame.height)
//Retrieves Images using assets.
allPhotos.enumerateObjects { (assets, index, pointer) in
DispatchQueue.global(qos: .background).sync {
PHImageManager.default().requestImage(for: assets, targetSize: imageSize, contentMode: .aspectFit, options: fetchOptions) { (image, hashDictionary) in
guard let image = image else {return}
self.imageArray.append(image)
self.albumImages.append(ImageAlbum(images: image))
}
}
}
selectedImage.image = imageArray.first
selectedImage.contentMode = .scaleAspectFill
}
How can I continue a timer in Today extension when the user swipes back up and closes the view? Every time I close my view, my label resets back to five minutes. The timer doesn't necessarily have to animate while the view is disappeared, but when the view loads again I would like the animation showing the updated time that passed while the view was gone to be smooth and fast. How can I keep it counting down in the background? What's the most efficient and logical way to do this? Thank you.
Here is my code thus far:
class TodayViewController: UIViewController, NCWidgetProviding {
var backgroundTaskIdentifier: UIBackgroundTaskIdentifier?
#IBOutlet weak var timerLabel: UILabel!
var counter = 300
var newCount = Int()
var timer: Timer?
override func viewDidLoad() {
super.viewDidLoad()
timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(updateInfo), userInfo: nil, repeats: true)
RunLoop.main.add(timer!, forMode: RunLoopMode.commonModes)
}
func updateInfo(){
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .positional
self.timerLabel.text = formatter.string(from: TimeInterval(self.counter))
counter -= 1
print(counter)
}
func widgetPerformUpdate(completionHandler: (#escaping (NCUpdateResult) -> Void)) {
completionHandler(NCUpdateResult.newData)
}
override func viewDidDisappear(_ animated: Bool) {
counter -= 1
}
}
I have been using the following code to call the UIActivityViewController for sharing stickers via the various social media apps:
if let image = sticker.getUIImage(), let imgData = UIImagePNGRepresentation(image) {
let activityVC = UIActivityViewController(activityItems: [imgData], applicationActivities: nil)
activityVC.popoverPresentationController?.sourceView = gesture.view
self.present(activityVC, animated: true, completion: nil)
} else {
ErrorHandler.handleError(STICKER_IMAGE_NOT_FOUND, sticker)
}
This code has been working fine until the most recent update to FB messenger (version 98.0). Now it shows an error "Couldn't load content". FB messenger appears to prefer a URL like this:
if let item = sticker.getImageURL() {
let activityVC = UIActivityViewController(activityItems: [item], applicationActivities: nil)
activityVC.popoverPresentationController?.sourceView = gesture.view
self.present(activityVC, animated: true, completion: nil)
} else {
ErrorHandler.handleError(STICKER_IMAGE_NOT_FOUND, sticker)
}
This works fine with FB Messenger but iMessage displays the transparent PNG with a black background.
I was looking at UIActivityViewControllerCompletionWithItemsHandler but the discussion states it runs after the activity, too late for what I need to do. I also tried creating a custom UIActivity returning UIActivityType.message for activityType but it was added on to the bottom of the controller rather than taking over the default.
Is there a way to intercept the selection of the item in UIActivityViewController so I can use the MFMessageComposeViewController and add the UIImagePNGRepresentation to the message and allow all the others to use the URL?
Is there a particular argument type that I can pass to UIActivityViewController that will correctly display transparent PNG with all the social apps?
TIA
Mike
Circling back to close this up. I eventually switched from using the UIActivityViewController universally to a system that customizes what is done for each type of service. I use BDGShare by Bob de Graaf. I build a list of the services that the app supports, show a button for each and then a switch to jump to each type of share. Just in case someone's working on this, here's what I came up with:
The types of sharing the app wants to support:
public enum ShareServiceType:Int {
case iMessage=0, facebook, twitter, instagram, whatsApp, facebookMessenger, email, more
}
A class to store information about the type of sharing service
public class ShareTargetVO: NSObject
{
var icon:String!
var label:String!
var type:ShareServiceType
init( serviceType:ShareServiceType, icon:String, label:String )
{
self.type = serviceType
self.icon = icon
self.label = label
}
}
A function in my social networking helper to populate the list of available services:
static func getShareTargetList(for sticker : ReeSticker) -> [ShareTargetVO] {
var services:Array<ShareTargetVO> = []
// Check to see which capabilities are present and add buttons
if (BDGShare.shared().isAvailable(forServiceType: SLServiceTypeFacebook)) {
services.append(ShareTargetVO(serviceType: ShareServiceType.facebook, icon: "Icon-Share-Facebook", label: "Facebook"))
}
// Checking for facebook service type because there's no availability check with FBSDK for messenger (could be rolled into the lib)
if (BDGShare.shared().isAvailable(forServiceType: SLServiceTypeFacebook) && !sticker.type.doesContain("video")) {
services.append(ShareTargetVO(serviceType: ShareServiceType.facebookMessenger, icon: "Icon-Share-Messenger", label: "Messenger"))
}
if (BDGShare.shared().isAvailable(forServiceType: SLServiceTypeTwitter)) {
services.append(ShareTargetVO(serviceType: ShareServiceType.twitter, icon: "Icon-Share-Twitter", label: "Twitter"))
}
if (BDGShare.shared().canSendSMS()) {
services.append(ShareTargetVO(serviceType: ShareServiceType.iMessage, icon: "Icon-Share-Messages", label: "Messages"))
}
if UIApplication.shared.canOpenURL(URL(string: "whatsapp://")! as URL) && !sticker.type.contains("video") {
services.append(ShareTargetVO(serviceType: ShareServiceType.whatsApp, icon: "Icon-Share-Whatsapp", label: "What's App?"))
}
if UIApplication.shared.canOpenURL(URL(string: "instagram://app")! as URL) && !sticker.type.contains("video") {
services.append(ShareTargetVO(serviceType: ShareServiceType.instagram, icon: "Icon-Share-Instagram", label: "Instagram"))
}
if (BDGShare.shared().canSendEmail()) {
services.append(ShareTargetVO(serviceType: ShareServiceType.email, icon: "Icon-Share-Mail", label: "Email"))
}
services.append(ShareTargetVO(serviceType: ShareServiceType.more, icon: "Icon-Share-More", label: "More"))
return services
}
A function in my view controller to populate a UICollectionView of buttons for sharing limited to those services that are returned from the list function:
func layoutShareButtons() {
let f = self.view.frame
let btnWidth = f.width * 0.82
let bannerWidth = btnWidth + 10
mask = UIView(frame: CGRect(x: 0, y: 0, width: f.width, height: f.height))
mask.backgroundColor = .black
mask.alpha = 0.3
self.view.addSubview(mask)
buttonList = SocialHelper.getShareTargetList(for: self.sticker)
let buttonGridLayout = UICollectionViewFlowLayout()
buttonGridLayout.sectionInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
buttonGridLayout.itemSize = CGSize(width: 60, height: 60)
buttonGridLayout.scrollDirection = .horizontal
buttonListView = UICollectionView(frame: CGRect(x: (f.width - bannerWidth) / 2,
y: self.preview.frame.origin.y + self.preview.frame.height + 10,
width: bannerWidth,
height: 80),
collectionViewLayout: buttonGridLayout)
buttonListView.register(ShareButtonCell.self, forCellWithReuseIdentifier: "shareButtonCell")
buttonListView.dataSource = self
buttonListView.delegate = self
self.view.addSubview(buttonListView)
// cancel button for sharing view
// Button (added last to ensure it's on top of the z-order)
cancelButton = SimpleButton(frame: CGRect(x: (f.width - bannerWidth) / 2, y: self.buttonListView.frame.origin.y + self.buttonListView.frame.height + 10, width: bannerWidth, height: 52))
cancelButton.backgroundColor = UIColor(netHex:0x202020)
cancelButton.layoutComponent(0, label: "Cancel")
cancelButton.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.cancelButtonPressed(_:))))
self.view.addSubview(self.cancelButton)
}
UICollectionView didSelect handler (for better SoC depending on your app remove the "share" function to a separate class just for the share implementation, in this app the screen we're working with is specifically for share):
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
self.share(shareTarget: buttonList[indexPath.row])
}
Finally, a function call the correct share type:
func share(shareTarget: ShareTargetVO) {
// Params to submit to service
self.shareUrl = self.sticker.getStickerURL()
let textStr = "" // BDGShare supports a message passed in as well but we just send the sticker
// we need the NSData either way (sticker / video)
var ok = true
// try? is fine here because result is tested below
let urlData : Data? = try? Data(contentsOf: self.shareUrl as URL)
ok = (urlData != nil)
var img: UIImage? = nil
// if it's an image type then get it
if ok {
if (self.shareUrl.pathExtension.contains("png")) || (self.shareUrl.pathExtension.contains("jpg")) {
img = UIImage(data: urlData! as Data)
ok = (img != nil)
}
}
if !ok {
let alertCtrl = UIAlertController(title: "Error sending", message: "There was an error gathering the information for sending this sticker.", preferredStyle: .alert)
alertCtrl.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
self.present(alertCtrl, animated: true, completion: nil)
return
}
switch shareTarget.type
{
case .iMessage:
BDGShare.shared().shareSMS(textStr, recipient: nil, image: img, data:urlData! as Data, imageName: "sendSticker.png", completion: {(SharingResult) -> Void in
// Handle share result...
self.handleShareResult(shareTarget.type, shareResult: SharingResult)
})
break
case .facebook:
BDGShare.shared().shareFacebook("", urlStr: "", image: img, completion: {(SharingResult) -> Void in
// Handle share result...
self.handleShareResult(shareTarget.type, shareResult: SharingResult)
})
break
case .twitter:
... more code for handling each type of share
}
}
So there are all the pieces I used to implement using BDGShare to get around the UIActivityViewController. BTW - the "More" option at the end of the list calls that UIActivityViewController so it's still available to the user if they so choose.
HTH, Mike