The Data.map implement in NSData [duplicate] - swift

Question

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?

Answer 1

If anyone is looking for a way to do this in Swift:
Swift 3 introduces the Data type, with value semantics. To convert the deviceToken to a String, you can do as follows:
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
let token = deviceToken.map { String(format: "%02.2hhx", $0) }.joined()
print(token)
}
Old answer using NSData:
func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
let tokenChars = UnsafePointer<CChar>(deviceToken.bytes)
var tokenString = ""
for i in 0..<deviceToken.length {
tokenString += String(format: "%02.2hhx", arguments: [tokenChars[i]])
}
print("tokenString: \(tokenString)")
}

Answer 2

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];
}

Answer 3

You could use this
- (NSString *)stringWithDeviceToken:(NSData *)deviceToken {
const char *data = [deviceToken bytes];
NSMutableString *token = [NSMutableString string];
for (NSUInteger i = 0; i < [deviceToken length]; i++) {
[token appendFormat:#"%02.2hhX", data[i]];
}
return [token copy];
}

Answer 4

For those who want in Swift 3 and most easier method
func extractTokenFromData(deviceToken:Data) -> String {
let token = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})
return token.uppercased();
}

Answer 5

Note - This will not work when compiling with the iOS 13 or later SDK
use this :
NSString * deviceTokenString = [[[[deviceToken description]
stringByReplacingOccurrencesOfString: #"<" withString: #""]
stringByReplacingOccurrencesOfString: #">" withString: #""]
stringByReplacingOccurrencesOfString: #" " withString: #""];
NSLog(#"The generated device token string is : %#",deviceTokenString);

Answer 6

Explanation of %02.2hhx in the high vote answer:
%: Introduces the x conversion specifier.
02: The minimum width of the converted value is 2. If the converted value has fewer bytes than the field width, it shall be padded with 0 on the left.
.2: Gives the minimum number of digits to appear for the x conversion specifier.
hh: Specifies that the x conversion specifier applies to a signed char or unsigned char argument (the argument will have been promoted according to the integer promotions, but its value shall be converted to signed char or unsigned char before printing).
x: The unsigned argument shall be converted to unsigned hexadecimal format in the style "dddd"; the letters "abcdef" are used. The precision specifies the minimum number of digits to appear; if the value being converted can be represented in fewer digits, it shall be expanded with leading zeros. The default precision is 1. The result of converting zero with an explicit precision of zero shall be no characters.
For more details, see the IEEE printf specification.
Based on the above explanation, I think it is better to change %02.2hhx to %02x or %.2x.
For Swift 5, the following methods are all feasible:
deviceToken.map({String(format: "%02x", $0)}).joined()
deviceToken.map({String(format: "%.2x", $0)}).joined()
deviceToken.reduce("", {$0 + String(format: "%02x", $1)})
deviceToken.reduce("", {$0 + String(format: "%.2x", $1)})
The test is as follows:
let deviceToken = (0..<32).reduce(Data(), {$0 + [$1]})
print(deviceToken.reduce("", {$0 + String(format: "%.2x", $1)}))
// Print content:
// 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f

Answer 7

In iOS 13 the description will be in different format. Kindly use below code to fetch the device token.
- (NSString *)fetchDeviceToken:(NSData *)deviceToken {
NSUInteger len = deviceToken.length;
if (len == 0) {
return nil;
}
const unsigned char *buffer = deviceToken.bytes;
NSMutableString *hexString = [NSMutableString stringWithCapacity:(len * 2)];
for (int i = 0; i < len; ++i) {
[hexString appendFormat:#"%02x", buffer[i]];
}
return [hexString copy];
}

Answer 8

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

Answer 9

I think converting deviceToken to hex byte string has no sense. Why? You will send it to your backend, where it will be transformed back to bytes to be pushed to APNS. So, use NSData's method base64EncodedStringWithOptions, push it to server, and then use reverse base64decoded data :) That is so much easier :)
NSString *tokenString = [tokenData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];

Answer 10

In iOS 13 description will break so use this
let deviceTokenString = deviceToken.map { String(format: "%02x", $0) }.joined()
For clarity, let’s break this down and explain each part:
The map method operates on each element of a sequence. Because Data is a sequence of bytes in Swift, the passed closure is evaluated for each byte in deviceToken.
The String(format:) initializer evaluates each byte in the data (represented by the anonymous parameter $0) using the %02x format specifier, to produce a zero-padded, 2-digit hexadecimal representation of the byte / 8-bit integer.
After collecting each byte representation created by the map method, joined() concatenates each element into a single string.
P.S don't use description gives different string in iOS 12 and iOS 13 and not safe as per future scope. Developers shouldn’t have relied on a specific format for an object’s description.
// iOS 12
(deviceToken as NSData).description // "<965b251c 6cb1926d e3cb366f dfb16ddd e6b9086a 8a3cac9e 5f857679 376eab7C>"
// iOS 13
(deviceToken as NSData).description // "{length = 32, bytes = 0x965b251c 6cb1926d e3cb366f dfb16ddd ... 5f857679 376eab7c }"
For more information read This.

Answer 11

2020
token as text...
let tat = deviceToken.map{ data in String(format: "%02.2hhx", data) }.joined()
or if you prefer
let tat2 = deviceToken.map { String(format: "%02.2hhx", $0) }.joined()
(result is the same)

Answer 12

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 13

Functional Swift version
One liner:
let hexString = UnsafeBufferPointer<UInt8>(start: UnsafePointer(data.bytes),
count: data.length).map { String(format: "%02x", $0) }.joinWithSeparator("")
Here's in a reusable and self documenting extension form:
extension NSData {
func base16EncodedString(uppercase uppercase: Bool = false) -> String {
let buffer = UnsafeBufferPointer<UInt8>(start: UnsafePointer(self.bytes),
count: self.length)
let hexFormat = uppercase ? "X" : "x"
let formatString = "%02\(hexFormat)"
let bytesAsHexStrings = buffer.map {
String(format: formatString, $0)
}
return bytesAsHexStrings.joinWithSeparator("")
}
}
Alternatively, use reduce("", combine: +) instead of joinWithSeparator("") to be seen as a functional master by your peers.
Edit: I changed String($0, radix: 16) to String(format: "%02x", $0), because one digit numbers needed to having a padding zero
(I don't know yet how to mark a question as a duplicate of this other one, so I just posted my answer again)

Answer 14

Throwing my answer on the pile. Avoid using string parsing; It's not guaranteed by the docs that NSData.description will always work that way.
Swift 3 Implementation:
extension Data {
func hexString() -> String {
var bytesPointer: UnsafeBufferPointer<UInt8> = UnsafeBufferPointer(start: nil, count: 0)
self.withUnsafeBytes { (bytes) in
bytesPointer = UnsafeBufferPointer<UInt8>(start: UnsafePointer(bytes), count:self.count)
}
let hexBytes = bytesPointer.map { return String(format: "%02hhx", $0) }
return hexBytes.joined()
}
}

Answer 15

This will work for you,
NSUInteger dataLength = deviceToken.length;
const unsigned char *dataBuffer = (const unsigned char *)deviceToken.bytes;
NSMutableString *deviceTokenString = [NSMutableString stringWithCapacity:(dataLength * 2)];
for (int i = 0; i < dataLength; ++i) {
[deviceTokenString appendFormat:#"%02x", dataBuffer[i]];
}
NSLog(#"The generated device token string is : %#",deviceTokenString);

Answer 16

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 17

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 18

Using updateAccumulatingResult is more efficient than the various other approaches found here, so here's the Swiftiest way to stringify your Data bytes:
func application(_ application: UIApplication,
didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
let token = deviceToken.reduce(into: "") { $0 += String(format: "%.2x", $1) }
print(token)
}

Answer 19

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

Answer 20

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

Answer 21

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

Answer 22

What about one line solution?
Objective C
NSString *token = [[data.description componentsSeparatedByCharactersInSet:[[NSCharacterSet alphanumericCharacterSet]invertedSet]]componentsJoinedByString:#""];
Swift
let token = data.description.components(separatedBy: CharacterSet.alphanumerics.inverted).joined()

Answer 23

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

Answer 24

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)")
}

Answer 25

Use excellent category!
// .h file
#interface NSData (DeviceToken)
- (NSString *)stringDeviceToken;
#end
// .m file
#import "NSData+DeviceToken.h"
#implementation NSData (DeviceToken)
- (NSString *)stringDeviceToken {
const unsigned *deviceTokenBytes = [deviceToken bytes];
NSString *deviceToken = [NSString stringWithFormat:#"%08x%08x%08x%08x%08x%08x%08x%08x",
ntohl(deviceTokenBytes[0]), ntohl(deviceTokenBytes[1]), ntohl(deviceTokenBytes[2]),
ntohl(deviceTokenBytes[3]), ntohl(deviceTokenBytes[4]), ntohl(deviceTokenBytes[5]),
ntohl(deviceTokenBytes[6]), ntohl(deviceTokenBytes[7])];
return deviceToken;
}
#end
// AppDelegate.m
#import "NSData+DeviceToken.h"
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
NSString *token = deviceToken.stringDeviceToken;
}
Works fine!

Answer 26

Swift 3:
If any one is looking for a way to get device token in Swift 3. Use the below modified snippet.
let characterSet: CharacterSet = CharacterSet( charactersIn: "<>" )
let deviceTokenString: String = (deviceToken.description as NSString)
.trimmingCharacters(in: characterSet as CharacterSet)
.replacingOccurrences(of: " ", with: "")
.uppercased()
print(deviceTokenString)

Answer 27

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

Answer 28

The solution #kulss posted here, while lacking in elegance but having the virtue of simplicity no longer works in iOS 13, since description will work differently for NSData. You can still use debugDescription though.
NSString * deviceTokenString = [[[[deviceToken debugDescription]
stringByReplacingOccurrencesOfString: #"<" withString: #""]
stringByReplacingOccurrencesOfString: #">" withString: #""]
stringByReplacingOccurrencesOfString: #" " withString: #""];

Answer 29

Try this one unless the data is null-terminated.
NSString* newStr = [[NSString alloc] initWithData:newDeviceToken
encoding:NSUTF8StringEncoding];

Answer 30

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