Clicking on username and going to profile - ios

Question

I am using Parse as my back end and have a home view where all user's photos will go, kind of like a stream, each cell has a header with the user's username where you can click it and go to their profile. However I can't figure out how to access the user's information and bring it to the next view.. This is my code so far.
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
static NSString *headerIdentifier = #"headerIdentifier";
UITableViewHeaderFooterView *headerView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:headerIdentifier];
if (headerView == nil) {
headerView = [[UITableViewHeaderFooterView alloc] initWithFrame:CGRectMake( 0.0f, 0.0f, self.view.bounds.size.width, 44.0f)];
//Container to hold everything.
self.containerView = [[UIView alloc] initWithFrame:CGRectMake( 0.0f, 0.0f, self.view.bounds.size.width, 44)];
self.containerView.backgroundColor = [UIColor clearColor];
[headerView.contentView addSubview:containerView];
UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
[button addTarget:self
action:#selector(viewProfile: user:)
forControlEvents:UIControlEventTouchUpInside];
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
button.frame = CGRectMake(8, 6, 100, 30);
//Setting the username to button.
PFObject *owner = [self.userPhotos objectAtIndex:section];
PFUser *user = [owner objectForKey:#"user"];
[user fetch];
self.usernameHolder = user.username;
[button setTitle:self.usernameHolder forState:UIControlStateNormal];
[containerView addSubview:button];
}
return headerView;
}
- (void)viewProfile:(UIButton *)button user:(PFUser *)user {
AccountView *accountView = [[AccountView alloc] init];
[accountView setUser:user];
[self.navigationController pushViewController:accountView animated:YES];
}
When I do an NSLog on the accountView it comes back as null and am very confused!

Answer 1

I think one issue is that the button isn't passing anything in the user parameter to the -viewProfile:user method.
As much as I hate using "magic numbers" for this sort of thing, what you probably need to do is use the .tag property on the button as an index to then lookup the user via the userPhotos. So...
Add in -tableView:viewForHeaderInSection:
button.tag = section
Change
[button addTarget:self action:#selector(viewProfile: user:) forControlEvents:UIControlEventTouchUpInside];
to
[button addTarget:self action:#selector(viewProfile:) forControlEvents:UIControlEventTouchUpInside];
And replace your -viewProfile:user: method with
- (void)viewProfile:(UIButton *)button {
AccountView *accountView = [[AccountView alloc] init];
PFObject *owner = [self.userPhotos objectAtIndex:button.tag];
PFUser *user = [owner objectForKey:#"user"];
[accountView setUser:user];
[self.navigationController pushViewController:accountView animated:YES];
}
You may or may not need to fetch the user again - I'm not sure if the Parse SDK will update the user in userPhotos when you fetch it. You could also avoid the fetch altogether if you .includeKey("user") on your query to get the userPhotos.