Why is my my controller not showing all the text fields properly?

Question

I've got two controllers. On first controller I have an add button. clicking this presents the user with a second controller that contains text fields. However, the text fields aren't shown properly. It seems like they need a margin from top. As shown in this screenshot

Here is my code

First controller

    class OneController < UITableViewController
     ....
       def viewDidLoad
        super

        rmq.stylesheet = OneControllerStylesheet

        view.tap do |table|
          table.delegate = self
          table.dataSource = self
          rmq(table).apply_style :table
        end

        self.navigationItem.rightBarButtonItems = [UIBarButtonItem.alloc.initWithBarButtonSystemItem(
            UIBarButtonSystemItemAdd,
            target: self,
            action: :addSomething)]
      end

  def addSomething
    self.add_category_controller.player = nil

    ctlr = UINavigationController.alloc.initWithRootViewController(self.add_something_controller)
    ctlr.modalTransitionStyle = UIModalTransitionStyleCoverVertical
    ctlr.delegate = self

    self.presentViewController(ctlr, animated:true, completion:nil)
  end

  def add_something_controller
    @add_something_controller ||= TwoController.new.tap do |ctlr|
        ctlr.navigationItem.leftBarButtonItem = UIBarButtonItem.alloc.initWithBarButtonSystemItem(
            UIBarButtonSystemItemCancel,
            target: self,
            action: :cancelAdd)

        ctlr.navigationItem.rightBarButtonItem = UIBarButtonItem.alloc.initWithBarButtonSystemItem(
            UIBarButtonSystemItemDone,
            target: self,
            action: :doneAdd)

        ctlr.navigationItem.rightBarButtonItem.enabled = false
    end
  end

    ...
    end

Second controller

    class TwoCategoryController < UIViewController
      ...
      def viewDidLoad
        puts "viewDidLoad"

        self.view.backgroundColor = UIColor.groupTableViewBackgroundColor

        self.view.addSubview(self.first_field)
        self.view.addSubview(self.last_field)
      end
     ...
    end

Answer 1

In iOS 6 (and prior), your view would have had its origin set to {x: 0, y: 64} (in window coordinates), which is below the navigation bar.

In iOS 7, though, we now have "full screen" views almost all the time. So that's what you're bumping into here. Your view is at {x: 0, y: 0}, and so is below the navigation and status bar.

I think the correct way to fix this is to use constraints on your controller view (self.view in TwoCategoryController), and you can use the UIViewController#topLayoutGuide and #bottomLayoutGuide to position it inside the visible area.

That would be the "correct" way, but you can also make it easy on yourself and just find out the height of the nav bar (44) + status bar (20), and store that in a variable or method, and then just correct the text field frames to be offset below that.