参考链接：http://www.jb51.net/article/109466.htm
1、新建Target

2017324102832872.jpg

屏幕快照 2017-12-25 下午4.18.07.png

• (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
  self.contentHandler = contentHandler;
  self.bestAttemptContent = [request.content mutableCopy];
  NSDictionary * userInfo = request.content.userInfo;
  NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
  NSURLSession *session = [NSURLSession sessionWithConfiguration:config];

  NSLog(@"来了远程通知--%@",userInfo);

  //服务端与客户端约定各种资源的url，根据url资源进行下载
  NSString * imageUrl = [userInfo objectForKey:@"imageUrl"];
  NSString * gifUrl = [userInfo objectForKey:@"gifUrl"];
  NSString * typeString ;
  NSURL * url;
  if (imageUrl.length>0) {
  url = [NSURL URLWithString:imageUrl];
  typeString = @"png";
  }
  if (gifUrl.length>0) {
  url = [NSURL URLWithString:gifUrl];
  typeString = @"gif";
  }
  if (url) {
  NSURLRequest * urlRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:5];
  //注意使用DownloadTask，这点会详细说明
  NSURLSessionDownloadTask *task = [session downloadTaskWithRequest:urlRequest completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
  if (!error) {
  NSString *path = [location.path stringByAppendingString:[NSString stringWithFormat:@".%@",typeString]];
  NSError *err = nil;
  NSURL * pathUrl = [NSURL fileURLWithPath:path];
  [[NSFileManager defaultManager] moveItemAtURL:location toURL:pathUrl error:nil];
  //下载完毕生成附件，添加到内容中
  UNNotificationAttachment *resource_attachment = [UNNotificationAttachment attachmentWithIdentifier:@"attachment" URL:pathUrl options:nil error:&err];
  if (resource_attachment) {
  self.bestAttemptContent.attachments = @[resource_attachment];
  }
  //设置为@""以后，进入app将没有启动页
  self.bestAttemptContent.launchImageName = @"";
  UNNotificationSound *sound = [UNNotificationSound defaultSound];
  self.bestAttemptContent.sound = sound;
  if (error) {
  NSLog(@"%@", error);
  }else{
  //回调给系统
  self.contentHandler(self.bestAttemptContent);
  }
  }
  else{
  self.contentHandler(self.bestAttemptContent);
  }
  }];
  [task resume];
  }
  else{
  self.contentHandler(self.bestAttemptContent);
  }

  // Modify the notification content here...
  // self.bestAttemptContent.title = [NSString stringWithFormat:@"%@ [modified]", self.bestAttemptContent.title];
  //
  // self.contentHandler(self.bestAttemptContent);
  }

• (void)serviceExtensionTimeWillExpire {
  // Called just before the extension will be terminated by the system.
  // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
  self.contentHandler(self.bestAttemptContent);
  }
  、、、

屏幕快照 2017-12-25 下午4.23.20.png