How To Dynamically change the contentSize of UIPopoverController?

Question

I have a UIViewController that contains a UITableView. This UIViewController is being displayed in a UIPopoverController.

Answer 1

I was having this same problem and none of the answers I found worked. I cobbled together that I think works well.

I have an array in my initWithCoder that holds my values. I simply run this code:

- (id)initWithCoder:(NSCoder *)aDecoder
{
//Popover Choices

_importantChoices = [NSMutableArray array];
[_importantChoices addObject:@"Bakery"];
[_importantChoices addObject:@"Beverage Dry Mix"];
[_importantChoices addObject:@"Beverage RTD"];
[_importantChoices addObject:@"Crisps"];
[_importantChoices addObject:@"Meat"];
[_importantChoices addObject:@"Supplements"];


//Calculate size of Popover
self.clearsSelectionOnViewWillAppear = NO;
NSInteger rowsCount = [_importantChoices count];
NSInteger singleRowHeight = [self.tableView.delegate tableView:self.tableView
                                       heightForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
NSInteger totalRowsHeight = rowsCount * singleRowHeight;
CGFloat largestLabelWidth = 0;
for (NSString *tmp in _importantChoices) {
    CGSize labelSize = [tmp sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:20.0f]}];
    if (labelSize.width > largestLabelWidth) {
        largestLabelWidth = labelSize.width;
    }
}
CGFloat popoverWidth = largestLabelWidth + 100;     //Add a little padding to the width
self.preferredContentSize = CGSizeMake(popoverWidth, totalRowsHeight);
return self;
}

Answer 2

Well, In the end i did something that I'm not sure if it's the right thing to do, but it is working.

I added a reference in my contentViewController to the popoverController:

@property (nonatomic , assign) UIPopoverController *popoverControllerContainer;

Then, I added the resizing code to viewWillAppear and viewDidAppear:

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.tableView reloadData];
}

-(void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    self.contentSizeForViewInPopover = self.tableView.contentSize;
}

-(void) viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [self.popoverControllerContainer setPopoverContentSize:self.contentSizeForViewInPopover animated:YES];
}

So, keeping a reference to the popover is kind of hack-ish, so I'm open to hear better ideas.