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

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


- (void)application:(UIApplication *)application
didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)newDeviceToken
{
NSString *tokenString = [NSString stringWithUTF8String:[newDeviceToken bytes]]; //[[NSString alloc]initWithData:newDeviceToken encoding:NSUTF8StringEncoding];
NSLog(@"%@", tokenString);
NSLog(@"%@", newDeviceToken);
}

The first line of code prints null. the second prints the token. How can I get my newDeviceToken as an NSString?

Try this one unless the data is null-terminated.

`NSString* newStr = [[NSString alloc] initWithData:newDeviceToken
encoding:NSUTF8StringEncoding];`

NSString *tokenstring = [[NSString alloc] initWithData:token encoding:NSUTF8StringEncoding];

It's my solution and It works well in my app:

NSString* newToken = [[[NSString stringWithFormat:@"%@",deviceToken]
stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]] stringByReplacingOccurrencesOfString:@" " withString:@""];

- convert `NSData` to `NSString` with `stringWithFormat`
- trim the "<>"
- remove the spaces

-(NSString *)deviceTokenWithData:(NSData *)data
{
NSString *deviceToken = [[data description] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]];
deviceToken = [deviceToken stringByReplacingOccurrencesOfString:@" " withString:@""];
return deviceToken;
}

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])];

NSString *tokenString = [[newDeviceToken description] stringByReplacingOccurrencesOfString:@"[<> ]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [[newDeviceToken description] length])];

For Swift :

var characterSet: NSCharacterSet = NSCharacterSet( charactersInString: "<>" )
var deviceTokenString: String = ( deviceToken.description as NSString )
.stringByTrimmingCharactersInSet( characterSet )
.stringByReplacingOccurrencesOfString( " ", withString: "" ) as String

println( deviceTokenString )

Swift:

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

Swift

// make sure that we have token for the devie on the App
func application(application: UIApplication
, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {

var tokenStr = deviceToken.description
tokenStr = tokenStr.stringByReplacingOccurrencesOfString("<", withString: "", options: [], range: nil)
tokenStr = tokenStr.stringByReplacingOccurrencesOfString(">", withString: "", options: [], range: nil)
tokenStr = tokenStr.stringByReplacingOccurrencesOfString(" ", withString: "", options: [], range: nil)



print("my token is: \(tokenStr)")

}