saveEventually - 使用 Parse 最小化应用程序时保存

Question

我在下面的代码部分使用saveEventually。问题是，当应用程序被最小化并重新打开时，saveEventually 不起作用，只有当应用程序完全关闭并重新打开时。有什么办法可以解决吗？

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
        // Generate Random Number
        int random = arc4random_uniform(1000000000);

        // Updates Location
        NSLog(@"Location: %@",newLocation);
        CLLocation *curentLocation = newLocation;

            if (curentLocation != nil) {

            // Submit through Parse
            PFObject *object = [PFObject objectWithClassName:@"Issue"];
            object[@"ID"] = [NSString stringWithFormat:@"%i",random];
            object[@"Latitude"] = [NSString stringWithFormat:@"%.8f",curentLocation.coordinate.latitude];
            object[@"Longitude"] = [NSString stringWithFormat:@"%.8f",curentLocation.coordinate.longitude];
            object[@"Signal"] = [NSString stringWithFormat:@"%@",_avgNumber];
            [object saveEventually];

            // Update Text Fields
            self.latitude.text = [NSString stringWithFormat:@"%.8f",curentLocation.coordinate.latitude];
            self.longitude.text = [NSString stringWithFormat:@"%.8f",curentLocation.coordinate.longitude];
            self.signal.text = [NSString stringWithFormat:@"%@",_avgNumber];

            }

    // Stop the Location Update
    [manager stopUpdatingLocation];

}

Answer 1

saveEventually 将在您描述的两种情况下工作。来自 Parse：“使用此方法保存的对象将本地存储在磁盘缓存中，直到它们可以交付给 Parse。 如果可能，它们将立即发送。否则，它们将在下次网络连接可用时发送。"

它应该可以工作，但如果不是，作为临时解决方法，您可以在保存对象之前检查连接性。如果您有互联网连接，请使用saveInBackground，如果没有，请使用saveEventually。所以是这样的：

if (isNetworkAvailable)
    [object saveInBackground];
else
    [object saveEventually];

- (BOOL)isNetworkAvailable
{
   CFNetDiagnosticRef dReference;        
   dReference = CFNetDiagnosticCreateWithURL (NULL, (__bridge CFURLRef)[NSURL URLWithString:@"www.apple.com"]);

   CFNetDiagnosticStatus status;
   status = CFNetDiagnosticCopyNetworkStatusPassively (dReference, NULL);        

   CFRelease (dReference);

   if ( status == kCFNetDiagnosticConnectionUp )
   {
      NSLog (@"Connection is Available");
      return YES;
   }
   else 
   {
    NSLog (@"Connection is down");
    return NO;
   }
}