Question

我有以下代码：

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
  NSLog(@"Silent notification %@", userInfo);
  if([userInfo[@"aps"][@"content-available"] intValue]== 1) //it's the silent notification
  {
    NSLog(@"It is 1!");
    [self callWebService];

    completionHandler(UIBackgroundFetchResultNewData);
    return;
  }
  else
  {
    NSLog(@"It is not 1!");
    completionHandler(UIBackgroundFetchResultNoData);
    return;
  }
}

#pragma mark - Web Service
- (void)callWebService {
  NSLog(@"call web service");
  cdata_branches=[NSMutableData data];

  NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
  [request setURL:[NSURL URLWithString:[NSString stringWithFormat:someURL]]];
  conn=[[NSURLConnection alloc] initWithRequest:request delegate:self];
}

#pragma mark -
#pragma mark Connection

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
  [cdata_branches setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
  [cdata_branches appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
  NSString *s_json=[[NSString alloc] initWithData:cdata_branches encoding:NSUTF8StringEncoding];
  NSLog(@"connectionDidFinishLoading JSON data=\n%@",s_json);

  UIAlertView *alertView;
  alertView = [[UIAlertView alloc] initWithTitle:@"Success"
                                         message:[s_json substringWithRange:NSMakeRange (25, 50)]
                                        delegate:nil
                               cancelButtonTitle:@"OK"
                               otherButtonTitles:nil];
  [alertView show];
}

我能够获得静默PN，但是，调用Web服务似乎失败了，因为它没有转到- (void)connectionDidFinishLoading:(NSURLConnection *)connection。

任何人都知道可能出现什么问题？

注意：

如果从- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

调用，则网络服务100％有效

Answer 1

在应用程序后台模式中启用后台提取。

在应用程序后台模式中启用远程通知。

远程通知是一种特殊的（并且命名很差）背景模式，允许应用程序下载内容以响应推送通知。

您将有30秒的时间来完成数据提取。最后在完成提取时调用完成处理程序。

收到静音推送通知时调用Web服务？

1 个答案: