Navigation Bar - Padding after relaunching app - swift

Question

I am setting a custom height for the navigation bar, also the status bar is hidden:
override func viewDidLayoutSubviews() {
let bounds = self.navigationController!.navigationBar.bounds
self.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: bounds.width, height: 60)
}
override var prefersStatusBarHidden: Bool {
return true
}
I also tried:
override func viewDidAppear(_ animated: Bool) {
self.navigationController!.navigationBar.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 40)
}
but after relaunching app there is a kind of padding on the top:
I saw this answer:
override func viewWillAppear(_ animated: Bool) {
let bounds = self.navigationController!.navigationBar.bounds
navigationController?.isNavigationBarHidden = true
let navBar: UINavigationBar = UINavigationBar(frame: CGRect(x: 0, y: 0, width: bounds.width, height: 60))
self.view.addSubview(navBar);
let navItem = UINavigationItem(title: "Add");
let doneItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.done, target: nil, action: #selector(addNewRecipe(_:)));
navItem.rightBarButtonItem = doneItem;
navBar.setItems([navItem], animated: false);
view.addSubview(navBar)
}
Is there another way than hiding the navigation bar and writing each navigation items programmatically?
Thanks!

Answer 1

Details
xCode 8.3, Swift 3.1
Full sample
Classes
import UIKit
class NavigationController: UINavigationController {
override func viewDidLayoutSubviews() {
navigationBar.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 100)
}
}
class ViewController: UIViewController {
override var prefersStatusBarHidden: Bool {
return true
}
}
Main.storyboard
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12118" systemVersion="16E195" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="NJV-2W-zhz">
<device id="retina4_7" orientation="portrait">
<adaptation id="fullscreen"/>
</device>
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12086"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--Main-->
<scene sceneID="tne-QT-ifu">
<objects>
<viewController id="BYZ-38-t0r" customClass="ViewController" customModule="stackoverflow_43295886" customModuleProvider="target" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
<viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
</view>
<navigationItem key="navigationItem" title="Main" id="CEB-N4-YPg"/>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="897" y="791"/>
</scene>
<!--Navigation Controller-->
<scene sceneID="rqG-Xx-QcO">
<objects>
<navigationController automaticallyAdjustsScrollViewInsets="NO" id="NJV-2W-zhz" customClass="NavigationController" customModule="stackoverflow_43295886" customModuleProvider="target" sceneMemberID="viewController">
<toolbarItems/>
<navigationBar key="navigationBar" contentMode="scaleToFill" id="klc-WP-4es">
<rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
<autoresizingMask key="autoresizingMask"/>
</navigationBar>
<nil name="viewControllers"/>
<connections>
<segue destination="BYZ-38-t0r" kind="relationship" relationship="rootViewController" id="vdV-Sr-o02"/>
</connections>
</navigationController>
<placeholder placeholderIdentifier="IBFirstResponder" id="Dng-hb-kZ9" userLabel="First Responder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="133.59999999999999" y="791.15442278860576"/>
</scene>
</scenes>
</document>
Result