iOS13 deviceToken获取

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    if (!deviceToken || ![deviceToken isKindOfClass:[NSData class]] || deviceToken.length==0) {
        return;
    }
    NSString *(^getDeviceToken)(void) = ^() {
        if (@available(iOS 13.0, *)) {
            const unsigned char *dataBuffer = (const unsigned char *)deviceToken.bytes;
            NSMutableString *myToken  = [NSMutableString stringWithCapacity:(deviceToken.length * 2)];
            for (int i = 0; i < deviceToken.length; i++) {
                [myToken appendFormat:@"%02x", dataBuffer[i]];
            }
            return (NSString *)[myToken copy];
        } else {
            NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"<>"];
            NSString *myToken = [[deviceToken description] stringByTrimmingCharactersInSet:characterSet];
            return [myToken stringByReplacingOccurrencesOfString:@" " withString:@""];
        }
    };
    NSString *myToken = getDeviceToken();
    NSLog(@"%@", myToken);
}