On Mar 12, 2021, at 10:55 AM, Alex Zavatone via groups.io <zav@...> wrote:

Sometimes we want to get the string value of the device token after requesting push auth from APNS in didRegisterForRemoteNotificationWithDeviceToken.

Here’s how you can get that string value in Objective-C and Swift.

Cheers,

Alex Zavatone

//

//  APNSHelper.h

//  pushy

//

//  Created by Alex Zavatone on 3/10/21.

//  Copyright © 2021. All rights reserved.

//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface APNSHelper : NSObject

+ (NSString *)stringFromDeviceToken:(NSData *)deviceToken;

@end

NS_ASSUME_NONNULL_END

//

//  APNSHelper.m

//  pushy

//

//  Created by Alex Zavatone on 3/10/21.

//  Copyright © 2021. All rights reserved.

//

#import "APNSHelper.h"

@implementation APNSHelper

+ (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 charIndex = 0; charIndex < length; charIndex++) {

        [hexString appendFormat:@"%02x", buffer[charIndex]];

    }

    return [hexString copy];

}

@end

//

//  APNSHelperSwift.swift

//  pushy

//

//  Created by Alex Zavatone on 3/11/21.

//

import Foundation

@objc(APNSHelperSwift)

class APNSHelperSwift: NSObject

{

    

    @objc(stringFromDeviceToken:) public class func stringFromDeviceToken(deviceToken: Data?) -> String?

    {

        if (deviceToken == nil) {

            return nil;

        }

        

        let length = deviceToken!.count * MemoryLayout<Int16>.stride

        if length == 0 {

            return nil

        }

    

        var hexString = ""

        

        var iter = deviceToken!.makeIterator()

        

        while true {

                   guard

                       let char = iter.next()

                      

                       else {

                           break

                       }

            hexString += String(format: "%02x", char)

        }

        

        return hexString

    }

}