Empty white space above UITableView inside a UIView

Try this one:

self.tableView.contentInset = UIEdgeInsetsMake(-65, 0, 0, 0)

Try to look in the 'attribute inspector' (in the right menu) of the Participants ViewController. Check for the option 'Extend Edges' and uncheck the 'Under Top Bars', and then relocate your tableview.

Another possible solution is to just uncheck the option 'Adjust Scroll View Insets'. The reason is that when the viewController extends its edges, let's say under the top bar, the tableView's scrollView automatically adjusts its inset top, so that the content of the tableView will start exactly under the top bar. But in your case this is not needed, since your tableView itself starts under the bar.

Focus on the ViewController and got to the Attribute Inspector tab:

Just add this in you ViewDidLoad method

self.automaticallyAdjustsScrollViewInsets = NO;