如何实现图标设置

          - (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
  self.contentHandler = contentHandler;
  self.bestAttemptContent = [request.content mutableCopy];
  self.bestAttemptContent.title = [NSString stringWithFormat:@"%@ [NotificationService]", self.bestAttemptContent.title];
  
  NSString * attachmentPath = self.bestAttemptContent.userInfo[@"my-attachment"];
  //if exist
  if (attachmentPath) {
    //download
    NSURL *fileURL = [NSURL URLWithString:attachmentPath];
    [self downloadAndSave:fileURL handler:^(NSString *localPath) {if (localPath) {UNNotificationAttachment * attachment = [UNNotificationAttachment attachmentWithIdentifier:@"myAttachment" URL:[NSURL fileURLWithPath:localPath] options:nil error:nil];
        self.bestAttemptContent.attachments = @[attachment];
      }
      [self apnsDeliverWith:request];
    }];
  }else{[self apnsDeliverWith:request];
  }
}

- (void)downloadAndSave:(NSURL *)fileURL handler:(void (^)(NSString *))handler {NSURLSession * session = [NSURLSession sharedSession];
  NSURLSessionDownloadTask *task = [session downloadTaskWithURL:fileURL completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
    NSString *localPath = nil;
    if (!error) {NSString * localURL = [NSString stringWithFormat:@"%@/%@", NSTemporaryDirectory(),fileURL.lastPathComponent];
      if ([[NSFileManager defaultManager] moveItemAtPath:location.path toPath:localURL error:nil]) {localPath = localURL;}
    }
    handler(localPath);
  }];
  [task resume];
  
}

        

          "notification": {
    "ios": {
        "alert": {
            "title": "title",
            "subtitle": "subtitle"
        },
        "mutable-content": true,
        "extras": {
            // 这个 key（my-attachment）值，需要与客户端的值对应，客户端工程拿到 key 值对应的 url 图标加载出来。
            "my-attachment": "https://raw.githubusercontent.com/Tikon/imgRepo/master/ic_launcher.png"
        }
    }
}  

        

          <!-- Set custom default icon. This is used when no icon is set for incoming notification messages.
     See README(https://goo.gl/l4GJaQ) for more. -->
<meta-data
    android:name="com.google.firebase.messaging.default_notification_icon"
    android:resource="@drawable/jpush_notification_icon" />
<!-- Set color used with incoming notification messages. This is used when no color is set for the incoming
     notification message. See README(https://goo.gl/6BKBk7) for more. -->
<meta-data
    android:name="com.google.firebase.messaging.default_notification_color"
    android:resource="@color/colorAccent" />

        

          "notification": {
    "android": {
        "alert": "Hi, JPush!",
        "title": "Send to Android",
        // 此字段值，若是极光 media_id, 则对其它厂商通道也会使用这个 media_id 下发，若非 media_id，则对走华硕通道下发和极光自有通道下发生效，不影响请求走其它厂商通道。
        "small_icon_uri": "jgmedia-2-98dc326f-f2f4-48ab-bb6b-1b87a803d699"
    }
},
"options": {
    "time_to_live": 60,
    "third_party_channel": {
        "huawei": {
            "distribution": "ospush",
            "small_icon_uri": "/raw/icon_hw" // 后台指定的路径，在客户端工程需要有这个图片, 放置目录为 res/raw/xxx.png               
        }
    }
}

        

          {
    "notification": {
        "android": {
            "alert": "Hi, JPush!",
            "title": "Send to Android",
            "large_icon": "jgmedia-2-98dc326f-f2f4-48ab-bb6b-1b87a803d699",
            "big_pic_path": "jgmedia-2-98dc326f-f2f4-48ab-bb6b-1b87a803d699",
            "style": 3
        }
    },
    "options": {
        "third_party_channel": {
            // 华为只支持右侧图标，不支持大图片
            "huawei": {
                "distribution": "ospush",
                "large_icon": "jgmedia-2-98dc326f-f2f4-48ab-bb6b-1b87a803d699",
                "style": 1
            },
            //oppo 单推不支持大图片和右侧图标，极光内部目前如果推送的 OPPO 目标小于 20 都会用 oppo 的单推接口下发推送，因此推送目标小于 20 个大图片和右侧图标是不生效的
            "oppo": {
                "distribution": "ospush",
                "large_icon": "jgmedia-2-98dc326f-f2f4-48ab-bb6b-1b87a803d699",
                "big_pic_path": "jgmedia-2-98dc326f-f2f4-48ab-bb6b-1b87a803d699",
                "style": 3
            }
        }
    }
}