在Objective-C中解析推送通知

Question

I am trying to implement iOS Push-Notifications using the Parse.com SDK. The problem is, that sometimes the Push Notification is not being sent without any error log. I have changed the code to this:

- (IBAction)send:(id)sender {
    PFQuery *usernameQuery = [PFUser query];
    [usernameQuery whereKey:@"objectId" containedIn:self.recipients];

    PFQuery *pushQuery = [PFInstallation query];
    [pushQuery whereKey:@"user" matchesQuery:usernameQuery];

    PFPush *push =[[PFPush alloc] init];
    [push setQuery:pushQuery];
    [push setMessage:[NSString stringWithFormat:@"%@: %@", [PFUser currentUser].username, self.kwik]];
    [push sendPushInBackground];

    [self.navigationController popToRootViewControllerAnimated:YES];

    NSLog(@"%p", push);
}

I don't know if this problem is still happening with the PFPush being allocated everytime the user is sending a push. Before I have changed the code to this one, I was calling self.push = [[PFPush alloc] init]; in the viewDidLoad method, because I didn't like to allocate a new PFPush everytime the user is sending a Push-Notification because of memory usage. My question now is: Is it important to allocate a new PFPush object everytime the user sends a push or can I allocate it in the viewDidLoad method?

Answer 1

The line:

PFPush *push =[[PFPush alloc] init];

creates an object, but references to it are short-lived (the time it takes to complete the asynch push request), and in an ARC project, code will be inserted at compile time to free it, so there's no need to worry about memory allocation.

You may have an unrelated problem getting the push to send. One way to debug is to use the block variety of push in background called sendPushInBackgroundWithBlock . With that you can check the error if there is on.