iOS13&Xcode11で通知が受け取れなくなった話

環境

• iPhone8
• iOS13.1.2
• Xcode11.1 GM

原因

• Objective-cの下記のコードで渡るdeviceTokenの中身が変わっていた

SampleAppDelegate.m

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    // iOS12:<00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000>
    // iOS13:{length = 32, bytes = 0x00000000 00000000 00000000 00000000 ... 00000000 00000000 }
    NSString *token = deviceToken.description;
}

対応

SampleAppDelegate.m

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    NSString *token = [self hexadecimalStringFromData:deviceToken];
}

-(NSString *)hexadecimalStringFromData:(NSData *)data {
    NSUInteger dataLength = data.length;
    if (dataLength == 0) {
        return nil;
    }

    const unsigned char *dataBuffer = data.bytes;
    NSMutableString *hexString  = [NSMutableString stringWithCapacity:(dataLength * 2)];
    for (int i = 0; i < dataLength; ++i) {
        [hexString appendFormat:@"%02x", dataBuffer[i]];
    }
    return [hexString copy];
}