I am trying to have the images on my tab bar do a bounce animation when they are selected by the user, but so far I have only been able to get them to bounce if the user is on the current tab and then they re-select the tab. Is there a way to make them bounce whenever the user taps them and from any tab?
Here is my code:
private var bounceAnimation: CAKeyframeAnimation = {
let bounceAnimation = CAKeyframeAnimation(keyPath: "transform.scale")
bounceAnimation.values = [1.0, 1.4, 0.9, 1.02, 1.0]
bounceAnimation.duration = TimeInterval(0.4)
bounceAnimation.calculationMode = CAAnimationCalculationMode.linear
return bounceAnimation
}()
override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
let idx = tabBar.items?.firstIndex(of: item)
let imageView: UIImageView? = self.tabBar.tabBarButtons[idx!].tabBarSwappableImageViews.first as? UIImageView
imageView.layer.add(bounceAnimation, forKey: nil)
}
Any help would be greatly appreciated. Thanks
Related
I have the following code:
import UIKit
class AnimatedTabBarController: UITabBarController {
private var bounceAnimation: CAKeyframeAnimation = {
let bounceAnimation = CAKeyframeAnimation(keyPath: "transform.scale")
bounceAnimation.values = [1.0, 1.4, 0.9, 1.02, 1.0]
bounceAnimation.duration = TimeInterval(0.3)
bounceAnimation.calculationMode = CAAnimationCalculationMode.cubic
return bounceAnimation
}()
override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
// find index if the selected tab bar item, then find the corresponding view and get its image, the view position is offset by 1 because the first item is the background (at least in this case)
guard let idx = tabBar.items?.firstIndex(of: item), tabBar.subviews.count > idx + 1, let imageView = tabBar.subviews[idx + 1].subviews.first as? UIImageView else {
return
}
imageView.layer.add(bounceAnimation, forKey: nil)
}
}
I am trying to create the twitter bounce animation when you click on an icon although this code is not doing anything. Anyone know what I'm doing wrong?
I forgot to set the class for my tab bar controller
FirebaseUI has a nice pre-buit UI for Swift. I'm trying to position an image view above the login buttons on the bottom. In the example below, the imageView is the "Hackathon" logo. Any logo should be able to show in this, if it's called "logo", since this shows the image as aspectFit.
According to the Firebase docs page:
https://firebase.google.com/docs/auth/ios/firebaseui
You can customize the signin screen with this function:
func authPickerViewController(forAuthUI authUI: FUIAuth) -> FUIAuthPickerViewController {
return FUICustomAuthPickerViewController(nibName: "FUICustomAuthPickerViewController",
bundle: Bundle.main,
authUI: authUI)
}
Using this code & poking around with subviews in the debuggers, I've been able to identify and color code views in the image below. Unfortunately, I don't think that the "true" size of these subview frames is set until the view controller presents, so trying to access the frame size inside these functions won't give me dimensions that I can use for creating a new imageView to hold a log. Plus accessing the views with hard-coded index values like I've done below, seems like a pretty bad idea, esp. given that Google has already changed the Pre-Built UI once, adding a scroll view & breaking the code of anyone who set the pre-built UI's background color.
func authPickerViewController(forAuthUI authUI: FUIAuth) -> FUIAuthPickerViewController {
// Create an instance of the FirebaseAuth login view controller
let loginViewController = FUIAuthPickerViewController(authUI: authUI)
// Set background color to white
loginViewController.view.backgroundColor = UIColor.white
loginViewController.view.subviews[0].backgroundColor = UIColor.blue
loginViewController.view.subviews[0].subviews[0].backgroundColor = UIColor.red
loginViewController.view.subviews[0].subviews[0].tag = 999
return loginViewController
}
I did get this to work by adding a tag (999), then in the completion handler when presenting the loginViewController I hunt down tag 999 and call a function to add an imageView with a logo:
present(loginViewController, animated: true) {
if let foundView = loginViewController.view.viewWithTag(999) {
let height = foundView.frame.height
print("FOUND HEIGHT: \(height)")
self.addLogo(loginViewController: loginViewController, height: height)
}
}
func addLogo(loginViewController: UINavigationController, height: CGFloat) {
let logoFrame = CGRect(x: 0 + logoInsets, y: self.view.safeAreaInsets.top + logoInsets, width: loginViewController.view.frame.width - (logoInsets * 2), height: self.view.frame.height - height - (logoInsets * 2))
// Create the UIImageView using the frame created above & add the "logo" image
let logoImageView = UIImageView(frame: logoFrame)
logoImageView.image = UIImage(named: "logo")
logoImageView.contentMode = .scaleAspectFit // Set imageView to Aspect Fit
// loginViewController.view.addSubview(logoImageView) // Add ImageView to the login controller's main view
loginViewController.view.addSubview(logoImageView)
}
But again, this doesn't seem safe. Is there a "safe" way to deconstruct this UI to identify the size of this button box at the bottom of the view controller (this size will vary if there are multiple login methods supported, such as Facebook, Apple, E-mail)? If I can do that in a way that avoids the hard-coding approach, above, then I think I can reliably use the dimensions of this button box to determine how much space is left in the rest of the view controller when adding an appropriately sized ImageView. Thanks!
John
This should address the issue - allowing a logo to be reliably placed above the prebuilt UI login buttons buttons + avoiding hard-coding the index values or subview locations. It should also allow for properly setting background color (also complicated when Firebase added the scroll view + login button subview).
To use: Create a subclass of FUIAuthDelegate to hold a custom view controller for the prebuilt Firebase UI.
The code will show the logo at full screen behind the buttons if there isn't a scroll view or if the class's private constant fullScreenLogo is set to false.
If both of these conditions aren't meant, the logo will show inset taking into account the class's private logoInsets constant and the safeAreaInsets. The scrollView views are set to clear so that a background image can be set, as well via the private let backgroundColor.
Call it in any signIn function you might have, after setting authUI.providers. Call would be something like this:
let loginViewController = CustomLoginScreen(authUI: authUI!)
let loginNavigationController = UINavigationController(rootViewController: loginViewController)
loginNavigationController.modalPresentationStyle = .fullScreen
present(loginNavigationController, animated: true, completion: nil)
And here's one version of the subclass:
class CustomLoginScreen: FUIAuthPickerViewController {
private var fullScreenLogo = false // false if you want logo just above login buttons
private var viewContainsButton = false
private var buttonViewHeight: CGFloat = 0.0
private let logoInsets: CGFloat = 16
private let backgroundColor = UIColor.white
private var scrollView: UIScrollView?
private var viewContainingButton: UIView?
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// set color of scrollView and Button view inside scrollView to clear in viewWillAppear to avoid a "color flash" when the pre-built login UI first appears
self.view.backgroundColor = UIColor.white
guard let foundScrollView = returnScrollView() else {
print("😡 Couldn't get a scrollView.")
return
}
scrollView = foundScrollView
scrollView!.backgroundColor = UIColor.clear
guard let foundViewContainingButton = returnButtonView() else {
print("😡 No views in the scrollView contain buttons.")
return
}
viewContainingButton = foundViewContainingButton
viewContainingButton!.backgroundColor = UIColor.clear
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// Create the UIImageView at full screen, considering logoInsets + safeAreaInsets
let x = logoInsets
let y = view.safeAreaInsets.top + logoInsets
let width = view.frame.width - (logoInsets * 2)
let height = view.frame.height - (view.safeAreaInsets.top + view.safeAreaInsets.bottom + (logoInsets * 2))
var frame = CGRect(x: x, y: y, width: width, height: height)
let logoImageView = UIImageView(frame: frame)
logoImageView.image = UIImage(named: "logo")
logoImageView.contentMode = .scaleAspectFit // Set imageView to Aspect Fit
logoImageView.alpha = 0.0
// Only proceed with customizing the pre-built UI if you found a scrollView or you don't want a full-screen logo.
guard scrollView != nil && !fullScreenLogo else {
print("No scrollView found.")
UIView.animate(withDuration: 0.25, animations: {logoImageView.alpha = 1.0})
self.view.addSubview(logoImageView)
self.view.sendSubviewToBack(logoImageView) // otherwise logo is on top of buttons
return
}
// update the logoImageView's frame height to subtract the height of the subview containing buttons. This way the buttons won't be on top of the logoImageView
frame = CGRect(x: x, y: y, width: width, height: height - (viewContainingButton?.frame.height ?? 0.0))
logoImageView.frame = frame
self.view.addSubview(logoImageView)
UIView.animate(withDuration: 0.25, animations: {logoImageView.alpha = 1.0})
}
private func returnScrollView() -> UIScrollView? {
var scrollViewToReturn: UIScrollView?
if self.view.subviews.count > 0 {
for subview in self.view.subviews {
if subview is UIScrollView {
scrollViewToReturn = subview as? UIScrollView
}
}
}
return scrollViewToReturn
}
private func returnButtonView() -> UIView? {
var viewContainingButton: UIView?
for view in scrollView!.subviews {
viewHasButton(view)
if viewContainsButton {
viewContainingButton = view
break
}
}
return viewContainingButton
}
private func viewHasButton(_ view: UIView) {
if view is UIButton {
viewContainsButton = true
} else if view.subviews.count > 0 {
view.subviews.forEach({viewHasButton($0)})
}
}
}
Hope this helps any who have been frustrated trying to configure the Firebase pre-built UI in Swift.
I want to create an animation like the iOS app facebook at tabswitch[1]. I have already tried to develop some kind of animation, the problem that occurs is that the old view controller becomes invisible directly on the switch, instead of fading out slowly while the new controller is sliding in fast.
I've found this SO question How to animate Tab bar tab switch with a CrossDissolve slide transition? but the as correct marked solution does not really work for me (it is not a slide it is a fade transition). What I'd also like to get is the function to make slide left or right to switch the tabs. Like it was on a older version of facebook.
What I've got so far is this:
extension TabBarController: UITabBarControllerDelegate {
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
guard let fromView = selectedViewController?.view,
let toView = viewController.view else { return false }
if fromView != toView {
toView.transform = CGAffineTransform(translationX: -90, y: 0)
UIView.animate(withDuration: 0.25, delay: 0.0, options: .curveEaseInOut, animations: {
toView.transform = CGAffineTransform(translationX: 0, y: 0)
})
}; return true
}
}
class TabBarController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
delegate = self
}
}
How to fix this?
[1]
I would very much like to add a gif from the Facebook app. The problem is that I don't want to censor the video and just reveal too much of my data. (Even if fb already has them). Also on youtube I didn't find a suitable recording. Please try it yourself in the fb app in iOS.
You can use the following idea: https://samwize.com/2016/04/27/making-tab-bar-slide-when-selected/
Also, here's the code updated to Swift 4.1 and I also removed the force unwrappings:
import UIKit
class MyTabBarController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
delegate = self
}
}
extension MyTabBarController: UITabBarControllerDelegate {
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
guard let tabViewControllers = tabBarController.viewControllers, let toIndex = tabViewControllers.index(of: viewController) else {
return false
}
animateToTab(toIndex: toIndex)
return true
}
func animateToTab(toIndex: Int) {
guard let tabViewControllers = viewControllers,
let selectedVC = selectedViewController else { return }
guard let fromView = selectedVC.view,
let toView = tabViewControllers[toIndex].view,
let fromIndex = tabViewControllers.index(of: selectedVC),
fromIndex != toIndex else { return }
// Add the toView to the tab bar view
fromView.superview?.addSubview(toView)
// Position toView off screen (to the left/right of fromView)
let screenWidth = UIScreen.main.bounds.size.width
let scrollRight = toIndex > fromIndex
let offset = (scrollRight ? screenWidth : -screenWidth)
toView.center = CGPoint(x: fromView.center.x + offset, y: toView.center.y)
// Disable interaction during animation
view.isUserInteractionEnabled = false
UIView.animate(withDuration: 0.3,
delay: 0.0,
usingSpringWithDamping: 1,
initialSpringVelocity: 0,
options: .curveEaseOut,
animations: {
// Slide the views by -offset
fromView.center = CGPoint(x: fromView.center.x - offset, y: fromView.center.y)
toView.center = CGPoint(x: toView.center.x - offset, y: toView.center.y)
}, completion: { finished in
// Remove the old view from the tabbar view.
fromView.removeFromSuperview()
self.selectedIndex = toIndex
self.view.isUserInteractionEnabled = true
})
}
}
So, you need to subclass UITabBarController and you also have to write the animation part, you can tweak the animation options (delay, duration, etc).
I hope it helps, cheers!
I've never seen Facebook so I don't know what the animation is. But you can have any animation you like when a tab bar controller changes its tab (child view controller), coherently and without any hacks, using the built-in mechanism that Apple provides for adding custom animation to a transition between view controllers. It's called custom transition animation.
Apple first introduced this mechanism in 2013. Here's a link to their video about it: https://developer.apple.com/videos/play/wwdc2013/218/
I immediately adopted this in my apps, and I think it makes them look a lot spiffier. Here's a demo of a tab bar controller custom transition that I like:
The really cool thing is that once you've decided what animation you want, making the transition interactive (i.e. drive it with a gesture instead of a button click) is easy:
Now, you might be saying: Okay, but that's not quite the animation I had in mind. No problem! Once you've got the hang of the custom transition architecture, changing the animation to anything you like is easy. In this variant, I just commented out one line so that the "old" view controller doesn't slide away:
So let your imagination run wild! Adopt custom transition animations, the way that iOS intends.
If you want something for pushViewController navigation, you can try this.
However, when switching between tabs on a TabBarController, this will not work. For that, I'd go with #mihai-erős 's solution
Change the Animation duration as per your liking, and assign this class to your navigation segues, for a Slide Animation.
class CustomPushSegue: UIStoryboardSegue {
override func perform() {
// first get the source and destination view controllers as UIviews so that they can placed in navigation stack
let sourceVCView = self.source.view as UIView!
let destinationVCView = self.destination.view as UIView!
let screenWidth = UIScreen.main.bounds.size.width
//create the destination view's rectangular frame i.e starting at 0,0 and equal to screenwidth by screenheight
destinationVCView?.transform = CGAffineTransform(translationX: screenWidth, y: 0)
//the destinationview needs to be placed on top(aboveSubView) of source view in the app window stack before being accessed by nav stack
// get the window and insert destination View
let window = UIApplication.shared.keyWindow
window?.insertSubview(destinationVCView!, aboveSubview: sourceVCView!)
// the animation: first remove the source out of screen by moving it at the left side of it and at the same time place the destination to source's position
// Animate the transition.
UIView.animate(withDuration: 0.3, animations: { () -> Void in
sourceVCView?.transform = CGAffineTransform(translationX: -screenWidth,y: 0)
destinationVCView?.transform = CGAffineTransform.identity
}, completion: { (Finished) -> Void in
self.source.present(self.destination, animated: false, completion: nil)
})
}
}
I made a custom modal transition by using UIViewControllerAnimatedTransitioning. After the transition has completed, a modally shown view controller fills part of parent view that some part of parent view controller is still visible.
I need to know how to detect tap on outside of shown view controller(or partially shown parent view controller) so I can use it to close the modal. I understand how to add gesture to a view but I cannot find which view to add a gesture to.
I looked through stackoverflow but there aren't example specifically for custom modal transition.
Here is a code for custom transition
class PartialSlideInAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
var direction: SlideAnimationDirectionStyle
var duration: TimeInterval = 0.125
var presentedControllerWidth: CGFloat = 250
let fadeAlpha: CGFloat = 0.5
init(direction: SlideAnimationDirectionStyle) {
self.direction = direction
super.init()
}
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return TimeInterval(duration)
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
// Setup Views
guard let presentedFromVC = transitionContext.viewController(forKey: .from) else {transitionContext.completeTransition(false); return }
guard let presentingToVC = transitionContext.viewController(forKey: .to) else {transitionContext.completeTransition(false); return }
let contrainerView = transitionContext.containerView // アニメーションはこのViewで行われる、アニメーションを実装する presenter, presenteeをこの上に載せないとアニメーションが動かない
// Setup Frames
let positionHidden = CGRect(x: contrainerView.frame.width + 1, y: 0, width: presentedControllerWidth, height: contrainerView.frame.height)
let positionShown = CGRect(x: contrainerView.frame.width - presentedControllerWidth, y: 0, width: presentedControllerWidth, height: contrainerView.frame.height)
switch direction {
case .slideIn:
contrainerView.addSubview(presentingToVC.view)
presentingToVC.view.frame = positionHidden
UIView.animate(withDuration: duration, animations: {
presentingToVC.view.frame = positionShown
presentedFromVC.view.alpha = self.fadeAlpha
}, completion: { success in
transitionContext.completeTransition( success )
})
case .slideOut:
contrainerView.addSubview(presentedFromVC.view)
presentedFromVC.view.frame = positionShown
UIView.animate(withDuration: duration, animations: {
presentedFromVC.view.frame = positionHidden
presentingToVC.view.alpha = 1.0
}, completion: { success in
transitionContext.completeTransition( success )
})
}
}
}
Have you tried using UIGestureRecognizer yet? The UIGestureRecognizer can be utilized to recognize tap events, both inside a child view controller and a parent view controller. For swift 3, there should be a handleTapBehind function of the UIRecognizerDelegate that should allow you to do what you're looking for.
See if the what is documented here
See the "Swift 3.1 solution that works in both portrait and landscape" in the linked post.
I can detect the button pressed in UIView through this simple code
func handlePan(recognizer:UIPanGestureRecognizer) {
if let buttonRecognize = recognizer.view as? UIButton {
let subviews = self.view.subviews as [UIView]
for v in subviews {
if let button = v as? UIButton {
if button.tag != -1 {
var p = button.superview?.convertPoint(button.center, toView: view)
println(p)
}
UIView.animateWithDuration(Double(slideFactor * 2),
delay: 0,
options: UIViewAnimationOptions.CurveEaseOut,
animations: {recognizer.view!.center = finalPoint },
completion: nil)
}}}}
}
As can detect the position of a button in UIView ?
for (0,0) of Uiview = (367.666656494141,207.33332824707) for func handlePan
I would like to find the value of the button than the UIView where the center is that of UIView itself and not the value of func handlePan where the center is the top left corner !!
P.S. I tried to move the let subview etc after
completion: nil
but the result does not change !!
You can convert a point coordinate system to that of the specified view using
convertPoint(_ point: CGPoint, toView view: UIView?)
The toView is the coordinate system to which it will be converted.