iOS Helper

//Background Task manager

.h 

@property (nonatomic) UIBackgroundTaskIdentifier bgTask;


.m

In n applicationDidEnterBackground

UIApplication *app = [UIApplication sharedApplication];
    self.bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
        [app endBackgroundTask:self.bgTask];
    }];

In applicationDidBecomeActive

// End Background Task
    if (self.bgTask != UIBackgroundTaskInvalid) {
        [[UIApplication sharedApplication] endBackgroundTask:self.bgTask];
    }


//Privacy and Terms click

        self.lblTermsAndPolicy.isUserInteractionEnabled = true
        let tapgesture = UITapGestureRecognizer(target: self, action: #selector(tappedOnLabel(_ :)))
        tapgesture.numberOfTapsRequired = 1
        self.lblTermsAndPolicy.addGestureRecognizer(tapgesture)


    @objc func tappedOnLabel(_ gesture: UITapGestureRecognizer) {
        guard let text = self.lblTermsAndPolicy.text else { return }
        let privacyPolicyRange = (text as NSString).range(of: "Privacy Policy.")
        let termsAndConditionRange = (text as NSString).range(of: "Terms of Use")
        if gesture.didTapAttributedTextInLabel(label: self.lblTermsAndPolicy, inRange: privacyPolicyRange) {
            let vc = self.storyboard?.instantiateViewController(identifier: "PrivacyPolicyVC")as! PrivacyPolicyVC
            self.navigationController?.pushViewController(vc, animated: true)
        } else if gesture.didTapAttributedTextInLabel(label: self.lblTermsAndPolicy, inRange: termsAndConditionRange){
            let vc = self.storyboard?.instantiateViewController(identifier: "TermsVC")as! TermsVC
            self.navigationController?.pushViewController(vc, animated: true)
        }
    }

//iOS SWIFT 13 Change
//Changes in iOS 13
didRegisterForRemoteNotificationsWithDeviceToken [deviceToken description]
iOS 12

<dd6ea57a 19bf0a05 c51692b6 e116c512 25fa04ef 9f84081d 576cc42f 639b62c3>
iOS 13
{length = 32, bytes = 0x35b57c5f cf576f17 55d221d4 67892ec4 ... 065ecf46 e1181548 }
    
    ——————————————
    
    //You may use this method to fetch the device token on iOS 13 onwards:
    //Objective-C:
    + (NSString *)stringFromDeviceToken:(NSData *)deviceToken { NSUInteger length = deviceToken.length;
        if (length == 0) {
            return nil; }
        const unsigned char *buffer = deviceToken.bytes;
        NSMutableString *hexString = [NSMutableString stringWithCapacity:(length * 2)];
        for (int i = 0; i < length; ++i) {
            [hexString appendFormat:@"%02x", buffer[i]];
        }
        return [hexString copy]; }

//Swift 5.0 (Untested)
class func string(fromDeviceToken deviceToken: Data?) -> String? { let length = deviceToken?.count ?? 0
    iOS HELP
    
    if length == 0 { return nil
    }
    let buffer = UInt8(deviceToken?.bytes ?? 0)
    var hexString = String(repeating: "\0", count: length * 2) for i in 0..<length {
        hexString += String(format: "%02x", buffer[i]) }
    return hexString }
—————————

//Common Bundle Id :
com.ebizz.temp

//Notification Center Inline :
NotificationCenter.default.post(name: Notification.Name("ChatScreen"), object: info, userInfo: nil)
NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: "ChatScreen"), object: nil, queue: nil) { (notification) in
    
    let object = notification.object as? NSDictionary ?? nil UserDefaults.standard.set(object, forKey: "notification")
    if(object != nil){
        let userToChat : User = User()
        userToChat.firebaseUID = object!["sender_id"] as? String ?? "" userToChat.strName = object!["username"] as? String ?? "" userToChat.strImageNAme = object!["image_url"] as? String ?? ""
        let chatViewController = self.storyboard?.instantiateViewController(withIdentifier: "ChatViewController") as! ChatViewController
        chatViewController.userToChat = userToChat
        self.navigationController?.pushViewController(chatViewController, animated: true)
    } }

//Background task Mgr :
var streamInBackground: UIBackgroundTaskIdentifier!
applicationDidEnterBackground {
    self.beginBackgroundTask() }
applicationDidBecomeActive {
    self.endBackgroundTask() }
extension AppDelegate {
    func beginBackgroundTask() { self.streamInBackground =
        UIApplication.shared.beginBackgroundTask(withName: "streamInBackground", expirationHandler: {
            self.endBackgroundTask() })
    }
    func endBackgroundTask() {
        if self.streamInBackground != UIBackgroundTaskIdentifier.invalid &&
            (self.streamInBackground != nil) { UIApplication.shared.endBackgroundTask(self.streamInBackground) self.streamInBackground = UIBackgroundTaskIdentifier.invalid
        } }
    func setupNotification() {
        let notificationCenter = UNUserNotificationCenter.current() notificationCenter.delegate = self
        let options: UNAuthorizationOptions = [.alert, .sound, .badge] notificationCenter.requestAuthorization(options: options) {
            (didAllow, error) in if !didAllow {
                print("User has declined notifications") }
        } }
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent
        
        notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert,.sound]) }
}
//P12 to Pem :
openssl pkcs12 -in pushcert.p12 -out pushcert.pem -nodes -clcerts

//Delete Archieve :
~/Library/Developer/Xcode/Archives

//OTP Textfield :
//Setup TextField
txtOTP1.addTarget(self, action: #selector(textFieldDidChange(textField:)),
for: .editingChanged)
txtOTP2.addTarget(self, action: #selector(textFieldDidChange(textField:)),
for: .editingChanged)
txtOTP3.addTarget(self, action: #selector(textFieldDidChange(textField:)),
for: .editingChanged)
txtOTP4.addTarget(self, action: #selector(textFieldDidChange(textField:)),
for: .editingChanged)
/**
 this the text file change method
 **/
@objc func textFieldDidChange(textField: UITextField){
    let text = textField.text
    if (text?.utf16.count)! >= 1 { switch textField {
    case txtOTP1:
        txtOTP2.becomeFirstResponder() case txtOTP2:
            txtOTP3.becomeFirstResponder() case txtOTP3:
                
                txtOTP4.becomeFirstResponder() case txtOTP4:
                    txtOTP4.resignFirstResponder() default:
        break }
    } else {
    } }
//MARK:- UITextField Delegate
func textField(_ textField: UITextField, shouldChangeCharactersIn range:
    NSRange, replacementString string: String) -> Bool { let maxLength = 1
    let currentString: NSString = textField.text! as NSString let newString: NSString =
        currentString.replacingCharacters(in: range, with: string) as NSString return newString.length <= maxLength
}
extension OTPViewController: UITextFieldDelegate {
    func textFieldDidBeginEditing(_ textField: UITextField) {
        textField.text = "" }
}

//Notification delay:
https://stackoverflow.com/questions/9204767/how-much-delay-of-ios-push-
notification#
https://docs.telerik.com/platform/backend-services/javascript/push-
notifications/troubleshooting/push-trb-ios.html
https://medium.com/yalantis-mobile/uber-underlying-technologies-and-how-
it-actually-works-526f55b37c6f


//HELP - HUBUC - User Defaults

//Replace data of For Loop in clearAll() in ALUserDefaultsHandler.m
NSMutableArray *arrMyData = [[NSMutableArray alloc] initWithObjects:@"isUserLogin",@"LoginData",@"ReturnedToken", @"OtherReturnedToken", @"UserRole", @"device_token", @"CurrentLatitude", @"CurrentLongitude", nil];
if (![arrMyData containsObject:defaultKeyString]) {
    if([defaultKeyString hasPrefix:KEY_PREFIX] && ![defaultKeyString isEqualToString:APN_DEVICE_TOKEN]) {
        [userDefaults removeObjectForKey:defaultKeyString];
        [userDefaults synchronize]; }
}

//Cell Button click
# Swift :-
var btnOpenDateTap : (() -> Void)? = nil
@IBAction func stepBtnOpenDatePicker(_ sender: Any) { if let function = self.btnOpenDateTap{
    function() }
}
Cell.btnOpenDateTap = {
}

# Obj C :-
@property (nonatomic, copy) void(^btnCloseTap)(void);
- (IBAction)btnCloseClick:(id)sender { self.btnCloseTap();
}
cell.btnCloseTap = ^{ };


//IMAGE PICKER Delegate :
UIImagePickerControllerDelegate, UINavigationControllerDelegate
//Initialisation :
//Image Picker
let imagePicker = UIImagePickerController() var imageData:String = ""

//btnClick :
imagePicker.delegate = self imagePicker.allowsEditing = true imagePicker.sourceType = .photoLibrary present(imagePicker, animated: true, completion: nil)
    //UITextView Placeholder
    - (void)viewDidLoad {
        commentTxtView.text = @"Comment"; commentTxtView.textColor = [UIColor lightGrayColor]; commentTxtView.delegate = self;
        }
        - (BOOL) textViewShouldBeginEditing:(UITextView *)textView {
            commentTxtView.text = @""; commentTxtView.textColor = [UIColor blackColor]; return YES;
}
-(void) textViewDidChange:(UITextView *)textView {
    if(commentTxtView.text.length == 0) { commentTxtView.textColor = [UIColor lightGrayColor]; commentTxtView.text = @"Comment"; [commentTxtView resignFirstResponder];
    } }

-(void) textViewShouldEndEditing:(UITextView *)textView {
    if(commentTxtView.text.length == 0) { commentTxtView.textColor = [UIColor lightGrayColor]; commentTxtView.text = @"Comment"; [commentTxtView resignFirstResponder];
    } }
    - (IBAction)addImage:(id)sender {
        UIActionSheet *action = [[[UIActionSheet alloc] initWithTitle:@"Select image
            from"
            Photo Picker - iOS
            delegate:self cancelButtonTitle:@"Cancel"
            destructiveButtonTitle:nil otherButtonTitles:@"From library",@"From
            camera", nil] autorelease];
            [action showInView:self.view]; }
        
        //#pragma mark - ActionSheet delegates
        - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex: (NSInteger)buttonIndex
{
    if( buttonIndex == 0 ) {
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            UIImagePickerController *pickerView =[[UIImagePickerController alloc]init];
            pickerView.allowsEditing = YES;
            pickerView.delegate = self;
            pickerView.sourceType = UIImagePickerControllerSourceTypeCamera; [self presentViewController:pickerView animated:YES completion:nil];
        }
    }else if( buttonIndex == 1 ) {
        UIImagePickerController *pickerView = [[UIImagePickerController alloc] init];
        
        pickerView.allowsEditing = YES; pickerView.delegate = self; [pickerView
        setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
        [self presentViewController:pickerView animated:YES completion:nil];
    } }
    //#pragma mark - PickerDelegates
    - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
        [self dismissViewControllerAnimated:YES completion:nil];
        UIImage * img = [info valueForKey:UIImagePickerControllerEditedImage];
        myImageView.image = img;
}
//Action sheet for iPad
alert.popoverPresentationController?.sourceView = sender alert.popoverPresentationController?.sourceRect = sender.bounds alert.popoverPresentationController?.permittedArrowDirections = .up
//Device support File
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/ DeviceSupport

//View Animation :
//MARK:- Pop in and out animation
func openDialog(hideView: UIView, animationView: UIView, type: String){
    hideView.isHidden = false animationView.transform = .identity
    animationView.transform = CGAffineTransform(scaleX: 0.01, y: 0.01)
    UIView.animate(withDuration: 0.2, delay: 0, options: .curveEaseOut, animations: {() -> Void in
        animationView.transform = .identity
        
    }, completion: {(finished: Bool) -> Void in
        // do something once the animation finishes, put it here
    }) }
func closeDialog(hideView: UIView, animationView: UIView, type: String){ UIView.animate(withDuration: 0.2, delay: 0, options: .curveEaseOut,
                                                                                        animations: {() -> Void in
                                                                                            animationView.transform = CGAffineTransform(scaleX: 0.01, y: 0.01)
}, completion: {(finished: Bool) -> Void in hideView.isHidden = true
    if(type == "true"){
        self.getExamList(start: self.strStartDateMain, end: self.strEndDateMain)
    } })
}

//Facebook (PageId)
if ([[UIApplic,tion sh,redApplic,tion] c,nOpenURL:[NSURL URLWithString:@"fb://"]]) {
    [[UIApplication sharedApplic,tion] openURL:[NSURL URLWithString:@"fb:// profile/100022140846004"]];
}
else {
    [[UIApplic,tion sh,redApplic,tion] openURL:[NSURL URLWithString:@"https:// www.f,cebook.com/qer,,h.,pp.96"]];
}

//Twitter (usern1me)
if ([[UIApplic,tion sh,redApplic,tion] c,nOpenURL:[NSURL URLWithString:@"twitter://"]]) {
    [[UIApplic,tion sh,redApplic,tion] openURL:[NSURL URLWithString:@"twitter:// user?screen_n,me=qer3,h"]];
}else{
    [[UIApplic,tion sh,redApplic,tion] openURL:[NSURL URLWithString:@"https://twitter.com/qer3,h"]]; }

//Inst1gr1m (usern1me)
if ([[UIApplic,tion sh,redApplic,tion] c,nOpenURL:[NSURL URLWithString:@"inst,gr,m://"]]) {
    //    Redirection - Profile
    [[UIApplic,tion sh,redApplic,tion] openURL:[NSURL URLWithString:@"inst,gr,m://user?usern,me=qer3,h"]];
}else{
    [[UIApplic,tion sh,redApplic,tion] openURL:[NSURL URLWithString:@"https://www.inst,gr,m.com/qer3,h/"]];
}


//Send Firebase notification - Swift
func SendNotification() {

    //Sending notification of assistance to selected user
    let url = URL(string: "https://fcm.googleapis.com/fcm/send")!
    let session = URLSession.shared
    let userDeviceId = "YOUR_FCM_TOKEN"
    let comment = Comment_Field.text!
    let assistanceDepartmentName = DepartmentName_Field.text!

    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    
    let parameters = [
        "to": userDeviceId,
        "notification" :
            [
                "body": comment,
                "title": "Assistance Required in " + assistanceDepartmentName + " Department.",
            ],
        ] as [String : Any]

    do {
        request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) // pass dictionary to nsdata object and set it as request body
    } catch let error {
        print(error.localizedDescription)
    }

    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("key="+YourFirebaseServerKey, forHTTPHeaderField: "Authorization")

    let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
        guard error == nil else {
            return
        }
        guard let data = data else {
            return
        }
        print("Success Notification sent")
        
    })
    task.resume()
}