Updated 2017.10.6
I had the same problem. Below is my solution. I assume that height size is 66.
My solution is working fine iOS 10, 11.
Please choose my answer if it helps you.
Create NavgationBar.swift
import UIKit
class NavigationBar: UINavigationBar {
//set NavigationBar's height
var customHeight : CGFloat = 66
override func sizeThatFits(_ size: CGSize) -> CGSize {
return CGSize(width: UIScreen.main.bounds.width, height: customHeight)
}
override func layoutSubviews() {
super.layoutSubviews()
frame = CGRect(x: frame.origin.x, y: 0, width: frame.size.width, height: customHeight)
// title position (statusbar height / 2)
setTitleVerticalPositionAdjustment(-10, for: UIBarMetrics.default)
for subview in self.subviews {
var stringFromClass = NSStringFromClass(subview.classForCoder)
if stringFromClass.contains("BarBackground") {
subview.frame = CGRect(x: 0, y: 0, width: self.frame.width, height: customHeight)
subview.backgroundColor = .yellow
}
stringFromClass = NSStringFromClass(subview.classForCoder)
if stringFromClass.contains("BarContent") {
subview.frame = CGRect(x: subview.frame.origin.x, y: 20, width: subview.frame.width, height: customHeight - 20)
subview.backgroundColor = UIColor(red: 20/255, green: 20/255, blue: 20/255, alpha: 0.4)
}
}
}
}
Set Storyboard
Set Custom NavigationBar class
Add TestView + Set SafeArea
ViewController.swift
import UIKit
class ViewController: UIViewController {
var navbar : UINavigationBar!
@IBOutlet weak var testView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
//update NavigationBar's frame
self.navigationController?.navigationBar.sizeToFit()
print("NavigationBar Frame : \(String(describing: self.navigationController!.navigationBar.frame))")
}
//Hide Statusbar
override var prefersStatusBarHidden: Bool {
return true
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(false)
//Important!
if #available(iOS 11.0, *) {
//Default NavigationBar Height is 44. Custom NavigationBar Height is 66. So We should set additionalSafeAreaInsets to 66-44 = 22
self.additionalSafeAreaInsets.top = 22
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
SecondViewController.swift
import UIKit
class SecondViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
// Create BackButton
var backButton: UIBarButtonItem!
let backImage = imageFromText("Back", font: UIFont.systemFont(ofSize: 16), maxWidth: 1000, color:UIColor.white)
backButton = UIBarButtonItem(image: backImage, style: UIBarButtonItemStyle.plain, target: self, action: #selector(SecondViewController.back(_:)))
self.navigationItem.leftBarButtonItem = backButton
self.navigationItem.leftBarButtonItem?.setBackgroundVerticalPositionAdjustment(-10, for: UIBarMetrics.default)
}
override var prefersStatusBarHidden: Bool {
return true
}
@objc func back(_ sender: UITabBarItem){
self.navigationController?.popViewController(animated: true)
}
//Helper Function : Get String CGSize
func sizeOfAttributeString(_ str: NSAttributedString, maxWidth: CGFloat) -> CGSize {
let size = str.boundingRect(with: CGSize(width: maxWidth, height: 1000), options:(NSStringDrawingOptions.usesLineFragmentOrigin), context:nil).size
return size
}
//Helper Function : Convert String to UIImage
func imageFromText(_ text:NSString, font:UIFont, maxWidth:CGFloat, color:UIColor) -> UIImage
{
let paragraph = NSMutableParagraphStyle()
paragraph.lineBreakMode = NSLineBreakMode.byWordWrapping
paragraph.alignment = .center // potentially this can be an input param too, but i guess in most use cases we want center align
let attributedString = NSAttributedString(string: text as String, attributes: [NSAttributedStringKey.font: font, NSAttributedStringKey.foregroundColor: color, NSAttributedStringKey.paragraphStyle:paragraph])
let size = sizeOfAttributeString(attributedString, maxWidth: maxWidth)
UIGraphicsBeginImageContextWithOptions(size, false , 0.0)
attributedString.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image!
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Yellow is barbackgroundView. Black opacity is BarContentView.
And I removed BarContentView's backgroundColor.
That's It.
