Why is there extra padding at the top of my UITableView with style UITableViewStyleGrouped in iOS7

Question

Starting in iOS7, there is additional space at the top of my UITableView's which have a style UITableViewStyleGrouped.

Here is an example:

The tableview starts at the first arrow, there are 35 pixels of unexplained padding, then the green header is a UIView returned by viewForHeaderInSection (where the section is 0).

Can anyone explain where this 35-pixel amount is coming from and how I can get rid of it without switching to UITableViewStylePlain?

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Update (Answer):

In iOS 11 and later:

tableView.contentInsetAdjustmentBehavior = .never 

Answer 1

I was helped by the following:

YouStoryboard.storyboard > YouViewController > Attributes inspector > Uncheck - Adjust scroll view insets.

Answer 2

I played around with it a bit more and it seems like this is a side-effect of setting the tableView's tableHeaderView = nil.

Because my tableView has a dynamically appearing tableHeaderView, when I need to hide the tableHeaderView, instead of doing self.tableView.tableHeaderView = nil;, I do:

self.tableView.tableHeaderView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, self.tableView.bounds.size.width, 0.01f)]; 

I like this solution better than setting a somewhat arbitrary contentInset.top because I use the contentInset.top dynamically as well. Having to remember to remove an extra 35px whenever I recalculate contentInset.top is tedious.