How to increase height for a custom UINavigationBar class in Swift - ios

Question

Update: I ended up by hiding the default navigation bar and added a UIView which looks same as the navigation bar. This may not sound good but instead of patching into the UINavigationBar this is good.
This is my custom UINavigationBar class which I have created to increase the height of navigation bar in my app. It doesn't work for me. Here's the code.
class PPBaseNavigationBar: UINavigationBar {
///The height you want your navigation bar to be of
static let navigationBarHeight: CGFloat = 83.0
///The difference between new height and default height
static let heightIncrease: CGFloat = navigationBarHeight - 44
override init(frame: CGRect) {
super.init(frame: frame)
initialize()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
initialize()
}
private func initialize() {
let shift = PPBaseNavigationBar.heightIncrease/2.0
///Transform all view to shift upward for [shift] point
self.transform = CGAffineTransform(translationX: 0, y: -shift)
}
override func layoutSubviews() {
super.layoutSubviews()
let shift = PPBaseNavigationBar.heightIncrease/2.0
///Move the background down for [shift] point
var classNamesToReposition: Array<String>?
if #available(iOS 10.0, *) {
classNamesToReposition = ["_UIBarBackground"]
} else {
classNamesToReposition = ["_UINavigationBarBackground"]
}
for view: UIView in self.subviews {
if (classNamesToReposition?.contains(NSStringFromClass(view.classForCoder)))! {
let bounds: CGRect = self.bounds
var frame: CGRect = view.frame
frame.origin.y = bounds.origin.y + shift - 20.0
frame.size.height = bounds.size.height + 20.0
view.frame = frame
}
}
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
let amendedSize:CGSize = super.sizeThatFits(size)
let newSize:CGSize = CGSize.init(width: amendedSize.width, height: PPBaseNavigationBar.navigationBarHeight)
return newSize;
}
}
All the method gets called except override func sizeThatFits(_ size: CGSize) -> CGSize {...} not sure, why?

Answer 1

It is not permissible to change the navigation bar object or modify its bounds, frame, or alpha values directly.
Modifying the Navigation Bar Object Directly
You can use custom view as navigation bar. Customize view as per your requirement(e.g change height) and hide the default navigation bar as
self.navigationController?.setNavigationBarHidden(true, animated: false)

Answer 2

layoutSubviews works as well override func sizeThatFits(_ size: CGSize).
so do not worry if it is not sizeThatFits called. I checked in layoutSubviews Navigationbar height are changing.
for view: UIView in self.subviews {
if (classNamesToReposition?.contains(NSStringFromClass(view.classForCoder)))! {
let bounds: CGRect = self.bounds
var frame: CGRect = view.frame
frame.origin.y = bounds.origin.y + shift - 20.0
frame.size.height = bounds.size.height + 150.0
view.frame = frame
}
}

Answer 3

Try like this, this worked for me in Swift 3:
extension UINavigationBar {
override open func sizeThatFits(_ size: CGSize) -> CGSize {
return CGSize(width: UIScreen.main.bounds.size.width, height: "Your custom height")
}
}
// MARK: - View life cycle methods
class DVNavigationController: UINavigationController {
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
navigationBar.frame.size.height = "Your custom height"
}
}
Finally assign this custom UINavigationController class to your navigationController.

Answer 4

Change your code like below
open override func sizeThatFits(_ size: CGSize) -> CGSize {
let amendedSize:CGSize = super.sizeThatFits(size)
let newSize:CGSize = CGSize.init(width: amendedSize.width, height: PPBaseNavigationBar.navigationBarHeight)
return newSize;
}
Might be worked for you.