How can I convert my device token (NSData) into an NSString?

Question

I am implementing push notifications. I\'d like to save my APNS Token as a String.

- (void)application:(UIApplication *)application
didRegisterForRemoteNotif         


        

Answer 1

This is a little bit shorter solution:

NSData *token = // ...
const uint64_t *tokenBytes = token.bytes;
NSString *hex = [NSString stringWithFormat:@"%016llx%016llx%016llx%016llx",
                 ntohll(tokenBytes[0]), ntohll(tokenBytes[1]),
                 ntohll(tokenBytes[2]), ntohll(tokenBytes[3])];

Answer 2

I've tried to test two different methods with format "%02.2hhx" and "%02x"

    var i :Int = 0
    var j: Int = 0
    let e: Int = Int(1e4)
    let time = NSDate.timeIntervalSinceReferenceDate
    while i < e {
        _ =  deviceToken.map { String(format: "%02x", $0) }.joined()
        i += 1
    }
    let time2 = NSDate.timeIntervalSinceReferenceDate
    let delta = time2-time
    print(delta)

    let time3 = NSDate.timeIntervalSinceReferenceDate
    while j < e {
        _ =  deviceToken.reduce("", {$0 + String(format: "%02x", $1)})
        j += 1
    }
    let time4 = NSDate.timeIntervalSinceReferenceDate
    let delta2 = time4-time3
    print(delta2)

and the result is that the fastest is "%02x" at average 2.0 vs 2.6 for the reduced version:

deviceToken.reduce("", {$0 + String(format: "%02x", $1)})

Answer 3

Here's how you do it in Xamarin.iOS

public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
{
    var tokenStringBase64 = deviceToken.GetBase64EncodedString(NSDataBase64EncodingOptions.None);
    //now you can store it for later use in local storage
}

Answer 4

Swift:

let tokenString = deviceToken.description.stringByReplacingOccurrencesOfString("[ <>]", withString: "", options: .RegularExpressionSearch, range: nil)

Answer 5

var token: String = ""
for i in 0..<deviceToken.count {
    token += String(format: "%02.2hhx", deviceToken[i] as CVarArg)
}

print(token)

Answer 6

Someone Helped me with this.I am just passing along

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)devToken {

    const unsigned *tokenBytes = [deviceToken bytes];
    NSString *hexToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
                         ntohl(tokenBytes[0]), ntohl(tokenBytes[1]), ntohl(tokenBytes[2]),
                         ntohl(tokenBytes[3]), ntohl(tokenBytes[4]), ntohl(tokenBytes[5]),
                         ntohl(tokenBytes[6]), ntohl(tokenBytes[7])];

    [[MyModel sharedModel] setApnsToken:hexToken];
}