I am new to Swift and I'm trying to reproduce the behavior most applications have when you zoom in an image (like Twitter, Facebook etc...). Basically, you tap on the image, it opens fullscreen and then you can zoom in and move freely around the zoomed in image. However, I'm having trouble with the last two parts.
My main ViewController has an instance of a custom UIImageView called TappableImage, which inherits from UIImageView. I use this class as a wrapper to handle touch and transitions, code is below:
import UIKit
class TappableImage: UIImageView {
private let windowBounds: CGRect = UIScreen.main.bounds
private let imageV: UIImageView = UIImageView()
private var startingFrame: CGRect = .zero
private var backdrop: ImageBackdrop!
private var isOpen: Bool = false
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
setup()
}
private func setup() {
image = UIImage(named: "kaws") // horizontal
// image = UIImage(named: "portrait") // vertical
// image = UIImage(named: "ksg") // square
isUserInteractionEnabled = true
startingFrame = frame
imageV.image = self.image
imageV.frame = startingFrame
imageV.contentMode = .scaleAspectFill
imageV.isUserInteractionEnabled = true
backdrop = ImageBackdrop(frame: windowBounds, with: imageV)
let openTapGesture = UITapGestureRecognizer(target: self, action: #selector(onTap))
openTapGesture.numberOfTapsRequired = 1
addGestureRecognizer(openTapGesture)
}
#objc private func onTap(_ sender: UITapGestureRecognizer) {
guard let window = UIApplication.shared.windows.first else {
print("no window...")
return
}
window.addSubview(backdrop)
UIView.animate(withDuration: 0.25, animations: {
self.backdrop.alpha = 1
let h = (self.windowBounds.width / self.startingFrame.width) * self.startingFrame.height
let y = self.windowBounds.height / 2 - h / 2
self.imageV.frame = CGRect(x: 0, y: y, width: self.windowBounds.width, height: h)
}) { (_) in
self.isOpen = true
}
}
}
When a user tap the image, I bring a custom UIScrollView to the front in which I added my TappableImage. The UIScrollView is a basic implementation just handling pinching, code is below:
import UIKit
class ImageBackdrop: UIScrollView, UIScrollViewDelegate {
private var imageView: UIImageView!
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder: NSCoder) {
super.init(coder: coder)
}
convenience init(frame: CGRect, with imgv: UIImageView) {
self.init(frame: frame)
imageView = imgv
setupScrollView()
addSubview(imageView)
}
private func setupScrollView() -> Void {
delegate = self
backgroundColor = .black
alpha = 0
minimumZoomScale = 1.0
maximumZoomScale = 5.0
contentSize = imageView.bounds.size
autoresizingMask = [.flexibleWidth, .flexibleHeight]
}
func viewForZooming(in scrollView: UIScrollView) -> UIView? { imageView }
}
My issue is that when I zoom in, the image is shifted down and I cannot move freely around with one finger. If I try to move to the bottom of the image, I am "slingshotted" back to the top, like when you arrive at the end of a list, you can find a video of this behavior here.
My guess is that the UIImageView center or size is incorrect but I cannot find a way to fix it.
We are looking to achieve something like a "butterbar", which is basically a UIView that changes color from the middle outwards to the edges. An example is this codepen .
How to do this in swift?
Here's a solution for you. Basically, there's a ButterBar UIView subclass, that has an inner view subview, and an array of colours.
Set the background to colour[0]
Set the inner background to colour[1]
Set the inner width to 0
Animate the inner width to the ButterBar width
Set the background colour to the inner background colour
Set the inner background to the next colour
Repeat
Code…
class ButterBar: UIView {
private let innerView = UIView(frame: .zero)
private var colours: [UIColor] = [.black, .white]
private var colourIndex = 0
private var isAnimating = false
private lazy var widthConstraint: NSLayoutConstraint = {
return innerView.widthAnchor.constraint(equalToConstant: 0)
}()
override init(frame: CGRect) {
super.init(frame: frame)
configure()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
configure()
}
func configure(colours: [UIColor]) {
guard colours.count > 1 else { return }
self.colours = colours
}
func startAnimating() {
colourIndex = 0
isAnimating = true
updateColours()
animate()
}
func stopAnimating() {
isAnimating = false
}
}
private extension ButterBar {
func configure() {
innerView.translatesAutoresizingMaskIntoConstraints = false
addSubview(innerView)
topAnchor.constraint(equalTo: innerView.topAnchor).isActive = true
bottomAnchor.constraint(equalTo: innerView.bottomAnchor).isActive = true
centerXAnchor.constraint(equalTo: innerView.centerXAnchor).isActive = true
widthConstraint.isActive = true
}
func updateColours() {
backgroundColor = colours[colourIndex]
colourIndex = (colourIndex + 1) % colours.count
innerView.backgroundColor = colours[colourIndex]
}
func animate() {
widthConstraint.constant = 0
layoutIfNeeded()
widthConstraint.constant = bounds.width
UIView.animate(withDuration: 1, animations: {
self.layoutIfNeeded()
}) { _ in
if self.isAnimating {
self.updateColours()
self.animate()
}
}
}
}
And…
#IBOutlet weak var butterBar: ButterBar!
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
butterBar.configure(colours: [.red, .blue, .green, .yellow])
butterBar.startAnimating()
}
You could use two UIViews that are constrained to the center of the parent and possess width constraints. Simply set the background color of the first view and animate its width constraint from 0 to the width of the parent. Once this is done, you can bring the other view to front and animate its width from 0 to the width of the parent, then restart with the initial view to keep the cycle going.
I am experiencing strange behavior when animating the height of an input accessory view. What am I doing wrong?
I create a UIInputView subclass (InputView) with a single subview. The height of InputView and its intrinsicContentSize are controlled by the subview. InputView is 50 pixels tall when isVisible is true and 0 pixels tall when isVisible is false.
import UIKit
class InputView: UIInputView {
private let someHeight: CGFloat = 50.0, zeroHeight: CGFloat = 0.0
private let subView = UIView()
private var hide: NSLayoutConstraint?, show: NSLayoutConstraint?
var isVisible: Bool {
get {
return show!.isActive
}
set {
// Always deactivate constraints before activating conflicting ones
if newValue == true {
hide?.isActive = false
show?.isActive = true
} else {
show?.isActive = false
hide?.isActive = true
}
}
}
// MARK: Sizing
override func sizeThatFits(_ size: CGSize) -> CGSize {
return CGSize(width: size.width, height: someHeight)
}
override var intrinsicContentSize: CGSize {
return CGSize.init(width: bounds.size.width, height: subView.bounds.size.height)
}
// MARK: Initializers
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override init(frame: CGRect, inputViewStyle: UIInputViewStyle) {
super.init(frame: frame, inputViewStyle: inputViewStyle)
addSubview(subView)
subView.backgroundColor = UIColor.purple
translatesAutoresizingMaskIntoConstraints = false
subView.translatesAutoresizingMaskIntoConstraints = false
subView.topAnchor.constraint(equalTo: layoutMarginsGuide.topAnchor).isActive = true
subView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
subView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
subView.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor).isActive = true
show = subView.heightAnchor.constraint(equalToConstant: someHeight)
hide = subView.heightAnchor.constraint(equalToConstant: zeroHeight)
hide?.isActive = true
}
}
The host view controller toggles isVisible in a one-second animation block when a button is pressed.
import UIKit
class MainViewController: UIViewController {
let testInputView = InputView.init(frame: .zero, inputViewStyle: .default)
#IBAction func button(_ sender: AnyObject) {
UIView.animate(withDuration: 1.0) {
let isVisible = self.testInputView.isVisible
self.testInputView.isVisible = !isVisible
self.testInputView.layoutIfNeeded()
}
}
override var canBecomeFirstResponder: Bool {
return true
}
override var inputAccessoryView: UIView? {
return testInputView
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
I expect the input accessory view to smoothly grow from the botton of the screen when isVisible is set to true, and smoothly shrink to the button of the screen when isVisible is set to false. Instead, the keyboard background overlay appears at full 50-pixel height as soon as isVisible is true and the input accessory view grows from the center of its frame.
When shrinking, the input accessory view instantly loses some of its height before continuing the animation smoothly.
I created an input accessory view demonstration project that displays this unexpected behavior.
This will give you the correct animation:
UIView.animate(withDuration: 1.0) {
let isVisible = self.testInputView.isVisible
self.testInputView.isVisible = !isVisible
self.testInputView.superview?.superview?.layoutIfNeeded()
}
However, it's never a good practice to call superview if Apple changes the design. So there may be a better answer.
This is what the superviews represent:
print(testInputView.superview) // UIInputSetHostView
print(testInputView.superview?.superview) // UIInputSetContainerView
EDIT: ADDED A SAFER SOLUTION
I'm not too familiar with the UIInputView. But one way of solving it without calling the superview would be to only animate the height change of the subview:
Step 1:
Move the isVisible outside the animation block.
#IBAction func button(_ sender: AnyObject) {
let isVisible = self.testInputView.isVisible
self.testInputView.isVisible = !isVisible
UIView.animate(withDuration: 1.0) {
self.testInputView.layoutIfNeeded()
}
}
Step 2:
Create a new method in your InputView which changes the height constraint of the InputView instead of the intrinsicContentSize.
private func updateHeightConstraint(height: CGFloat) {
for constraint in constraints {
if constraint.firstAttribute == .height {
constraint.constant = height
}
}
self.layoutIfNeeded()
}
Step 3:
And call that method inside the setter.
if newValue == true {
updateHeightConstraint(height: someHeight)
hide?.isActive = false
show?.isActive = true
} else {
updateHeightConstraint(height: zeroHeight)
show?.isActive = false
hide?.isActive = true
}
Step 4:
Lastly some changes in the init.
override init(frame: CGRect, inputViewStyle: UIInputViewStyle) {
super.init(frame: frame, inputViewStyle: inputViewStyle)
addSubview(subView)
backgroundColor = .clear
subView.backgroundColor = UIColor.purple
subView.translatesAutoresizingMaskIntoConstraints = false
subView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
subView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
subView.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor).isActive = true
show = subView.heightAnchor.constraint(equalToConstant: someHeight)
hide = subView.heightAnchor.constraint(equalToConstant: zeroHeight)
hide?.isActive = true
}
Conclusion:
This result in the InputView changes it's height before animating the height of the purple subview. The only downside is the UIInputView, which has some kind of gray background as default and cannot be changed to Clear. However, you can use the same backgroundColor as the VC.
But if you instead should go with a regular UIView as InputAccessoryView it will be UIColor.clear as default. Than the first "jump" will not be noticed.
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?
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)
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
}
}
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.
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.
Now in iOS 11, the sizeThatFits method is not called from UINavigationBar subclasses. Changing the frame of UINavigationBar causes glitches and wrong insets.
So, any ideas how to customize navbar height now?
According to Apple developers (look here, here and here), changing navigation bar height in iOS 11 is not supported. Here they suggest to do workarounds like having a view under the navigation bar (but outside of it) and then remove the nav bar border. As a result, you will have this in storyboard:
look like this on the device:
Now you can do a workaround that was suggested in the other answers: create a custom subclass of UINavigationBar, add your custom large subview to it, override sizeThatFits and layoutSubviews, then set additionalSafeAreaInsets.top for the navigation's top controller to the difference customHeight - 44px, but the bar view will still be the default 44px, even though visually everything will look perfect. I didn't try overriding setFrame, maybe it works, however, as Apple developer wrote in one of the links above: "...and neither is [supported] changing the frame of a navigation bar that is owned by a UINavigationController (the navigation controller will happily stomp on your frame changes whenever it deems fit to do so)."
In my case the above workaround made views to look like this (debug view to show borders):
As you can see, the visual appearance is quite good, the additionalSafeAreaInsets correctly pushed the content down, the big navigation bar is visible, however I have a custom button in this bar and only the area that goes under the standard 44 pixel nav bar is clickable (green area in the image). Touches below the standard navigation bar height doesn't reach my custom subview, so I need the navigation bar itself to be resized, which the Apple developers say is not supported.
Updated 07 Jan 2018
This code is support XCode 9.2, iOS 11.2
I had the same problem. Below is my solution. I assume that height size is 66.
Please choose my answer if it helps you.
Create CINavgationBar.swift
import UIKit
#IBDesignable
class CINavigationBar: UINavigationBar {
//set NavigationBar's height
#IBInspectable var customHeight : CGFloat = 66
override func sizeThatFits(_ size: CGSize) -> CGSize {
return CGSize(width: UIScreen.main.bounds.width, height: customHeight)
}
override func layoutSubviews() {
super.layoutSubviews()
print("It called")
self.tintColor = .black
self.backgroundColor = .red
for subview in self.subviews {
var stringFromClass = NSStringFromClass(subview.classForCoder)
if stringFromClass.contains("UIBarBackground") {
subview.frame = CGRect(x: 0, y: 0, width: self.frame.width, height: customHeight)
subview.backgroundColor = .green
subview.sizeToFit()
}
stringFromClass = NSStringFromClass(subview.classForCoder)
//Can't set height of the UINavigationBarContentView
if stringFromClass.contains("UINavigationBarContentView") {
//Set Center Y
let centerY = (customHeight - subview.frame.height) / 2.0
subview.frame = CGRect(x: 0, y: centerY, width: self.frame.width, height: subview.frame.height)
subview.backgroundColor = .yellow
subview.sizeToFit()
}
}
}
}
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.
this works for me :
- (CGSize)sizeThatFits:(CGSize)size {
CGSize sizeThatFit = [super sizeThatFits:size];
if ([UIApplication sharedApplication].isStatusBarHidden) {
if (sizeThatFit.height < 64.f) {
sizeThatFit.height = 64.f;
}
}
return sizeThatFit;
}
- (void)setFrame:(CGRect)frame {
if ([UIApplication sharedApplication].isStatusBarHidden) {
frame.size.height = 64;
}
[super setFrame:frame];
}
- (void)layoutSubviews
{
[super layoutSubviews];
for (UIView *subview in self.subviews) {
if ([NSStringFromClass([subview class]) containsString:#"BarBackground"]) {
CGRect subViewFrame = subview.frame;
subViewFrame.origin.y = 0;
subViewFrame.size.height = 64;
[subview setFrame: subViewFrame];
}
if ([NSStringFromClass([subview class]) containsString:#"BarContentView"]) {
CGRect subViewFrame = subview.frame;
subViewFrame.origin.y = 20;
subViewFrame.size.height = 44;
[subview setFrame: subViewFrame];
}
}
}
Added:
The problem is solved in iOS 11 beta 6 ,so the code below is of no use ^_^
Original answer:
Solved with code below :
(I always want the navigationBar.height + statusBar.height == 64 whether the hidden of statusBar is true or not)
#implementation P1AlwaysBigNavigationBar
- (CGSize)sizeThatFits:(CGSize)size {
CGSize sizeThatFit = [super sizeThatFits:size];
if ([UIApplication sharedApplication].isStatusBarHidden) {
if (sizeThatFit.height < 64.f) {
sizeThatFit.height = 64.f;
}
}
return sizeThatFit;
}
- (void)setFrame:(CGRect)frame {
if ([UIApplication sharedApplication].isStatusBarHidden) {
frame.size.height = 64;
}
[super setFrame:frame];
}
- (void)layoutSubviews
{
[super layoutSubviews];
if (![UIApplication sharedApplication].isStatusBarHidden) {
return;
}
for (UIView *subview in self.subviews) {
NSString* subViewClassName = NSStringFromClass([subview class]);
if ([subViewClassName containsString:#"UIBarBackground"]) {
subview.frame = self.bounds;
}else if ([subViewClassName containsString:#"UINavigationBarContentView"]) {
if (subview.height < 64) {
subview.y = 64 - subview.height;
}else {
subview.y = 0;
}
}
}
}
#end
Simplified with Swift 4.
class CustomNavigationBar : UINavigationBar {
private let hiddenStatusBar: Bool
// MARK: Init
init(hiddenStatusBar: Bool = false) {
self.hiddenStatusBar = hiddenStatusBar
super.init(frame: .zero)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// MARK: Overrides
override func layoutSubviews() {
super.layoutSubviews()
if #available(iOS 11.0, *) {
for subview in self.subviews {
let stringFromClass = NSStringFromClass(subview.classForCoder)
if stringFromClass.contains("BarBackground") {
subview.frame = self.bounds
} else if stringFromClass.contains("BarContentView") {
let statusBarHeight = self.hiddenStatusBar ? 0 : UIApplication.shared.statusBarFrame.height
subview.frame.origin.y = statusBarHeight
subview.frame.size.height = self.bounds.height - statusBarHeight
}
}
}
}
}
Along with overriding -layoutSubviews and -setFrame: you should check out the newly added UIViewController's additionalSafereaInsets property (Apple Documentation) if you do not want the resized navigation bar hiding your content.
Although it's fixed in beta 4, it seems the background image of the nav bar does not scale with the actual view (you can verify this by looking at at in the view-hierarchy viewer). A workaround for now is to override layoutSubviews in your custom UINavigationBar and then use this code:
- (void)layoutSubviews
{
[super layoutSubviews];
for (UIView *subview in self.subviews) {
if ([NSStringFromClass([subview class]) containsString:#"BarBackground"]) {
CGRect subViewFrame = subview.frame;
subViewFrame.origin.y = -20;
subViewFrame.size.height = CUSTOM_FIXED_HEIGHT+20;
[subview setFrame: subViewFrame];
}
}
}
If you notice, the bar background in fact has an offset of -20 to make it appear behind the status bar, so the calculation above adds that in.
on Xcode 9 Beta 6 I still have the issue. The Bar always looks 44 pixel height and it is pushed under the status bar.
In order to solve that I made a subclass with #strangetimes code (in Swift)
class NavigationBar: UINavigationBar {
override func layoutSubviews() {
super.layoutSubviews()
for subview in self.subviews {
var stringFromClass = NSStringFromClass(subview.classForCoder)
print("--------- \(stringFromClass)")
if stringFromClass.contains("BarBackground") {
subview.frame.origin.y = -20
subview.frame.size.height = 64
}
}
}
}
and I place the bar lower than the status bar
let newNavigationBar = NavigationBar(frame: CGRect(origin: CGPoint(x: 0,
y: 20),
size: CGSize(width: view.frame.width,
height: 64)
)
)
This works well for the regular navigation bar. If your using the LargeTitle this wont work well because the titleView size isn't going to be a fixed height of 44 points. But for the regular view this should be suffice.
Like #frangulyan apple suggested to add a view beneath the navBar and hide the thin line (shadow image). This is what I came up with below. I added an uiview to the navigationItem's titleView and then added an imageView inside that uiview. I removed the thin line (shadow image). The uiview I added is the same exact color as the navBar. I added a uiLabel inside that view and that's it.
Here's the 3d image. The extended view is behind the usernameLabel underneath the navBar. Its gray and has a thin line underneath of it. Just anchor your collectionView or whatever underneath of the thin separatorLine.
The 9 steps are explained above each line of code:
class ExtendedNavController: UIViewController {
fileprivate let extendedView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.backgroundColor = .white
return view
}()
fileprivate let separatorLine: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.backgroundColor = .gray
return view
}()
fileprivate let usernameLabel: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.font = UIFont.systemFont(ofSize: 14)
label.text = "username goes here"
label.textAlignment = .center
label.lineBreakMode = .byTruncatingTail
label.numberOfLines = 1
return label
}()
fileprivate let myTitleView: UIView = {
let view = UIView()
view.backgroundColor = .white
return view
}()
fileprivate let profileImageView: UIImageView = {
let imageView = UIImageView()
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.clipsToBounds = true
imageView.backgroundColor = .darkGray
return imageView
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
// 1. the navBar's titleView has a height of 44, set myTitleView height and width both to 44
myTitleView.frame = CGRect(x: 0, y: 0, width: 44, height: 44)
// 2. set myTitleView to the nav bar's titleView
navigationItem.titleView = myTitleView
// 3. get rid of the thin line (shadow Image) underneath the navigationBar
navigationController?.navigationBar.setValue(true, forKey: "hidesShadow")
navigationController?.navigationBar.layoutIfNeeded()
// 4. set the navigationBar's tint color to the color you want
navigationController?.navigationBar.barTintColor = UIColor(red: 249.0/255.0, green: 249.0/255.0, blue: 249.0/255.0, alpha: 1.0)
// 5. set extendedView's background color to the same exact color as the navBar's background color
extendedView.backgroundColor = UIColor(red: 249.0/255.0, green: 249.0/255.0, blue: 249.0/255.0, alpha: 1.0)
// 6. set your imageView to get pinned inside the titleView
setProfileImageViewAnchorsInsideMyTitleView()
// 7. set the extendedView's anchors directly underneath the navigation bar
setExtendedViewAndSeparatorLineAnchors()
// 8. set the usernameLabel's anchors inside the extendedView
setNameLabelAnchorsInsideTheExtendedView()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(true)
// 9. **Optional** If you want the shadow image to show on other view controllers when popping or pushing
navigationController?.navigationBar.setBackgroundImage(nil, for: .default)
navigationController?.navigationBar.setValue(false, forKey: "hidesShadow")
navigationController?.navigationBar.layoutIfNeeded()
}
func setExtendedViewAndSeparatorLineAnchors() {
view.addSubview(extendedView)
view.addSubview(separatorLine)
extendedView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
extendedView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
extendedView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
extendedView.heightAnchor.constraint(equalToConstant: 29.5).isActive = true
separatorLine.topAnchor.constraint(equalTo: extendedView.bottomAnchor).isActive = true
separatorLine.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
separatorLine.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
separatorLine.heightAnchor.constraint(equalToConstant: 0.5).isActive = true
}
func setProfileImageViewAnchorsInsideMyTitleView() {
myTitleView.addSubview(profileImageView)
profileImageView.topAnchor.constraint(equalTo: myTitleView.topAnchor).isActive = true
profileImageView.centerXAnchor.constraint(equalTo: myTitleView.centerXAnchor).isActive = true
profileImageView.widthAnchor.constraint(equalToConstant: 44).isActive = true
profileImageView.heightAnchor.constraint(equalToConstant: 44).isActive = true
// round the profileImageView
profileImageView.layoutIfNeeded()
profileImageView.layer.cornerRadius = profileImageView.frame.width / 2
}
func setNameLabelAnchorsInsideTheExtendedView() {
extendedView.addSubview(usernameLabel)
usernameLabel.topAnchor.constraint(equalTo: extendedView.topAnchor).isActive = true
usernameLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
usernameLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
}
}
This is what I use. It works for regular content (44.0 px) if you use UISearchBar as title or other views that modify the size of the bar content, you must update the values accordingly. Use this at your own risk since it might brake at some point.
This is the navbar with 90.0px height hardcoded, working on both iOS 11 and older versions. You might have to add some insets to the UIBarButtonItem for pre iOS 11 to look the same.
class NavBar: UINavigationBar {
override init(frame: CGRect) {
super.init(frame: frame)
if #available(iOS 11, *) {
translatesAutoresizingMaskIntoConstraints = false
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
return CGSize(width: UIScreen.main.bounds.width, height: 70.0)
}
override func layoutSubviews() {
super.layoutSubviews()
guard #available(iOS 11, *) else {
return
}
frame = CGRect(x: frame.origin.x, y: 0, width: frame.size.width, height: 90)
if let parent = superview {
parent.layoutIfNeeded()
for view in parent.subviews {
let stringFromClass = NSStringFromClass(view.classForCoder)
if stringFromClass.contains("NavigationTransition") {
view.frame = CGRect(x: view.frame.origin.x, y: frame.size.height - 64, width: view.frame.size.width, height: parent.bounds.size.height - frame.size.height + 4)
}
}
}
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: 90)
subview.backgroundColor = .yellow
}
stringFromClass = NSStringFromClass(subview.classForCoder)
if stringFromClass.contains("BarContent") {
subview.frame = CGRect(x: subview.frame.origin.x, y: 40, width: subview.frame.width, height: subview.frame.height)
}
}
}
}
And you add it to a UINavigationController subclass like this:
class CustomBarNavigationViewController: UINavigationController {
init() {
super.init(navigationBarClass: NavBar.self, toolbarClass: nil)
}
override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
}
override init(rootViewController: UIViewController) {
super.init(navigationBarClass: NavBar.self, toolbarClass: nil)
self.viewControllers = [rootViewController]
}
required public init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
I was doubling the height of my navigation bar so I could add a row of status icons above the default navigation controls, by subclassing UINavigationBar and using sizeThatFits to override the height. Fortunately this has the same effect, and is simpler, with fewer side effects. I tested it with iOS 8 through 11. Put this in your view controller:
- (void)viewDidLoad {
[super viewDidLoad];
if (self.navigationController) {
self.navigationItem.prompt = #" "; // this adds empty space on top
}
}