ios - 如何避免手动设置 UIPopoverController 的大小？

Question

当我在弹出窗口中显示 ViewController 时，它会调整视图的大小。为避免这种情况，我必须使用 UIPopoverController setPopoverContentSize:settingsViewSize 手动设置视图大小

我试图覆盖 contentSizeForViewInPopover

-(CGSize)contentSizeForViewInPopover
{
    return self.view.frame.size;
}

……但无济于事。

建议？

Answer 1

Your code doesn't work because contentSizeForViewInPopover is called before viewWillDisplay, so the frames of the views haven't been set yet. There are a few things you can do though.

If you are using a UITableViewController a little known trick to sizing your UIPopoverViewController to match the height of your UITableView is to use the tableView's rectForSection method to give you the height. Use the height in your viewController's contentSizeForViewInPopover like this:

- (CGSize)contentSizeForViewInPopover 
{
    // Currently no way to obtain the width dynamically before viewWillAppear.
    CGFloat width = 200.0; 
    NSInteger lastSectionIndex = [self.tableView numberOfSections] - 1;
    CGRect rect = [self.tableView rectForSection:lastSectionIndex];
    CGFloat height = CGRectGetMaxY(rect);
    return (CGSize){width, height};
}

Or alternately, you can manually set the contentSizeForViewInPopopver property in your viewController's viewWillAppear: method and set the popover's size when you create it.

So, in your viewController which will be in the popover, you'll have this:

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

And you'd create your popover like this:

MyViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"vc"];
self.currentPopover = [[UIPopoverController alloc] initWithContentViewController:vc];
[self.currentPopover presentPopoverFromRect:sender.bounds 
                                     inView:sender 
                   permittedArrowDirections:UIPopoverArrowDirectionUp 
                                   animated:YES];

// resize the popover to match what you set in vc viewDidLoad
[self.currentPopover setPopoverContentSize:vc.contentSizeForViewInPopover animated:NO];