iPhone：アニメーションでタブを切り替える方法
UITabBarController.selectedIndexを使用して、タブバー駆動型アプリケーションでプログラムでタブを切り替えています。私が解決しようとしている問題は、ビュー間の遷移をアニメーション化する方法です。すなわち。現在のタブのビューから選択したタブのビューへ。
最初に考えたのはUITabBarControllerDelegateを使用することでしたが、プログラムでタブを切り替えるときにこれは呼び出されないようです。 UITabBarDelegate.didSelectItem：を、トランジションアニメーションを設定するための可能なフックとして検討しています。
誰かがトランジションをアニメーション化できましたか？はいの場合、どのように？
Update 04/2016：これを更新して、みんなに感謝していると言いたいすべての投票に対して。また、これは元々、... ARCの前、制約の前、...多くのものの前に書かれていたことにも注意してください！したがって、これらの手法を使用するかどうかを決定する際には、これを考慮してください。より現代的なアプローチがあるかもしれません。ああ、それを見つけたら。全員が見ることができるように応答を追加してください。ありがとう。
しばらくして...
多くの研究の結果、2つの実用的なソリューションを思いつきました。これらは両方とも機能し、タブ間のアニメーションを行いました。
解決策1：ビューからの移行（単純）
これが最も簡単で、事前定義されたUIView遷移メソッドを利用します。このソリューションでは、メソッドが作業を行うため、ビューを管理する必要はありません。
// Get views. controllerIndex is passed in as the controller we want to go to.
UIView * fromView = tabBarController.selectedViewController.view;
UIView * toView = [[tabBarController.viewControllers objectAtIndex:controllerIndex] view];
// Transition using a page curl.
[UIView transitionFromView:fromView
toView:toView
duration:0.5
options:(controllerIndex > tabBarController.selectedIndex ? UIViewAnimationOptionTransitionCurlUp : UIViewAnimationOptionTransitionCurlDown)
completion:^(BOOL finished) {
if (finished) {
tabBarController.selectedIndex = controllerIndex;
}
}];
解決策2：スクロール（より複雑）
より複雑なソリューションですが、アニメーションをより細かく制御できます。この例では、ビューをスライドさせてオンとオフを切り替えます。これを使用して、ビューを自分で管理する必要があります。
// Get the views.
UIView * fromView = tabBarController.selectedViewController.view;
UIView * toView = [[tabBarController.viewControllers objectAtIndex:controllerIndex] view];
// Get the size of the view area.
CGRect viewSize = fromView.frame;
BOOL scrollRight = controllerIndex > tabBarController.selectedIndex;
// Add the to view to the tab bar view.
[fromView.superview addSubview:toView];
// Position it off screen.
toView.frame = CGRectMake((scrollRight ? 320 : -320), viewSize.Origin.y, 320, viewSize.size.height);
[UIView animateWithDuration:0.3
animations: ^{
// Animate the views on and off the screen. This will appear to slide.
fromView.frame =CGRectMake((scrollRight ? -320 : 320), viewSize.Origin.y, 320, viewSize.size.height);
toView.frame =CGRectMake(0, viewSize.Origin.y, 320, viewSize.size.height);
}
completion:^(BOOL finished) {
if (finished) {
// Remove the old view from the tabbar view.
[fromView removeFromSuperview];
tabBarController.selectedIndex = controllerIndex;
}
}];
Swiftのこのソリューション：
extension TabViewController: UITabBarControllerDelegate {
public func tabBarController(tabBarController: UITabBarController, shouldSelectViewController viewController: UIViewController) -> Bool {
let fromView: UIView = tabBarController.selectedViewController!.view
let toView : UIView = viewController.view
if fromView == toView {
return false
}
UIView.transitionFromView(fromView, toView: toView, duration: 0.3, options: UIViewAnimationOptions.TransitionCrossDissolve) { (finished:Bool) in
}
return true
}
}
以下は、drekkaのコードフォームをdelegate（UITabBarControllerDelegate）メソッドに使用しようとする試みです。
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
NSArray *tabViewControllers = tabBarController.viewControllers;
UIView * fromView = tabBarController.selectedViewController.view;
UIView * toView = viewController.view;
if (fromView == toView)
return false;
NSUInteger fromIndex = [tabViewControllers indexOfObject:tabBarController.selectedViewController];
NSUInteger toIndex = [tabViewControllers indexOfObject:viewController];
[UIView transitionFromView:fromView
toView:toView
duration:0.3
options: toIndex > fromIndex ? UIViewAnimationOptionTransitionFlipFromLeft : UIViewAnimationOptionTransitionFlipFromRight
completion:^(BOOL finished) {
if (finished) {
tabBarController.selectedIndex = toIndex;
}
}];
return true;
}
IOS7.0以上の私のソリューション。
Tabバーのデリゲートでカスタムアニメーションコントローラーを指定できます。
次のようなアニメーションコントローラーを実装します。
@interface TabSwitchAnimationController : NSObject <UIViewControllerAnimatedTransitioning>
@end
@implementation TabSwitchAnimationController
- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
return 0.2;
}
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
UIViewController* fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController* toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIView* toView = toVC.view;
UIView* fromView = fromVC.view;
UIView* containerView = [transitionContext containerView];
[containerView addSubview:toView];
toView.frame = [transitionContext finalFrameForViewController:toVC];
// Animate by fading
toView.alpha = 0.0;
[UIView animateWithDuration:[self transitionDuration:transitionContext]
delay:0.0
options:UIViewAnimationOptionCurveEaseOut | UIViewAnimationOptionAllowUserInteraction
animations:^{
toView.alpha = 1.0;
}
completion:^(BOOL finished) {
toView.alpha = 1.0;
[fromView removeFromSuperview];
[transitionContext completeTransition:YES];
}];
}
@end
次に、UITabBarControllerDelegateで使用します。
- (id <UIViewControllerAnimatedTransitioning>)tabBarController:(UITabBarController *)tabBarController
animationControllerForTransitionFromViewController:(UIViewController *)fromVC
toViewController:(UIViewController *)toVC
{
return [[TabSwitchAnimationController alloc] init];
}
tabBarController:shouldSelectViewController:を使用する代わりに、tabBarController:animationControllerForTransitionFromViewController:toViewController:を実装することをお勧めします
TransitioningObject.Swift
import UIKit
class TransitioningObject: NSObject, UIViewControllerAnimatedTransitioning {
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
let fromView: UIView = transitionContext.viewForKey(UITransitionContextFromViewKey)!
let toView: UIView = transitionContext.viewForKey(UITransitionContextToViewKey)!
transitionContext.containerView().addSubview(fromView)
transitionContext.containerView().addSubview(toView)
UIView.transitionFromView(fromView, toView: toView, duration: transitionDuration(transitionContext), options: UIViewAnimationOptions.TransitionCrossDissolve) { finished in
transitionContext.completeTransition(true)
}
}
func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {
return 0.25
}
}
TabBarViewController.Swift
import UIKit
class TabBarViewController: UITabBarController, UITabBarControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
}
// MARK: - Tabbar delegate
func tabBarController(tabBarController: UITabBarController, animationControllerForTransitionFromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return TransitioningObject()
}
}
CATransitionを使用してUITabBarControlelrの遷移を簡単に実現できると思います。これにより、transitionFromView：toViewを使用した場合の副作用も解決されます。
UITabBarControllerから拡張されたカスタムTabBarControllerクラス内でこれを使用します。
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController (UIViewController*)viewController {
CATransition *animation = [CATransition animation];
[animation setType:kCATransitionFade];
[animation setDuration:0.25];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:
kCAMediaTimingFunctionEaseIn]];
[self.view.window.layer addAnimation:animation forKey:@"fadeTransition"];
}
お役に立てれば ：）
ここでさまざまな答えを試した後、 post を書きました。
コードはSwiftにあり、animateToTabを呼び出すことでアニメーションでタブをプログラムで変更できます。
func animateToTab(toIndex: Int) {
let tabViewControllers = viewControllers!
let fromView = selectedViewController!.view
let toView = tabViewControllers[toIndex].view
let fromIndex = tabViewControllers.indexOf(selectedViewController!)
guard 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.mainScreen().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.userInteractionEnabled = false
UIView.animateWithDuration(0.5, delay: 0.0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: UIViewAnimationOptions.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.userInteractionEnabled = true
})
}
すべてのタブの変更にアニメーションが必要な場合は、次のようにUITabBarControllerDelegateにフックします。
func tabBarController(tabBarController: UITabBarController, shouldSelectViewController viewController: UIViewController) -> Bool {
let tabViewControllers = tabBarController.viewControllers!
guard let toIndex = tabViewControllers.indexOf(viewController) else {
return false
}
// Our method
animateToTab(toIndex)
return true
}
Swiftでの私のソリューション：
カスタムTabBarクラスを作成し、ストーリーボードのTabBarに設定します
class MainTabBarController: UITabBarController, UITabBarControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
// Do any additional setup after loading the view.
}
func tabBarController(tabBarController: UITabBarController, shouldSelectViewController viewController: UIViewController) -> Bool {
let tabViewControllers = tabBarController.viewControllers!
let fromView = tabBarController.selectedViewController!.view
let toView = viewController.view
if (fromView == toView) {
return false
}
let fromIndex = tabViewControllers.indexOf(tabBarController.selectedViewController!)
let toIndex = tabViewControllers.indexOf(viewController)
let offScreenRight = CGAffineTransformMakeTranslation(toView.frame.width, 0)
let offScreenLeft = CGAffineTransformMakeTranslation(-toView.frame.width, 0)
// start the toView to the right of the screen
if (toIndex < fromIndex) {
toView.transform = offScreenLeft
fromView.transform = offScreenRight
} else {
toView.transform = offScreenRight
fromView.transform = offScreenLeft
}
fromView.tag = 124
toView.addSubview(fromView)
self.view.userInteractionEnabled = false
UIView.animateWithDuration(0.5, delay: 0.0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
toView.transform = CGAffineTransformIdentity
}, completion: { finished in
let subViews = toView.subviews
for subview in subViews{
if (subview.tag == 124) {
subview.removeFromSuperview()
}
}
tabBarController.selectedIndex = toIndex!
self.view.userInteractionEnabled = true
})
return true
}
}
@Mofumofuのソリューションを使用して、Swift 1.2にアップグレードし、アップ/ダウンアニメーションも実装しました。つまり、新しいViewControllerが起動し、新しいViewControllerのインデックスがそうでなければ、方向は下になります。
class TabScrollPageAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
let tabBarController: UITabBarController
init(tabBarController: UITabBarController) {
self.tabBarController = tabBarController
}
func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {
return 0.5
}
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
if let fromVC = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey),
let toVC = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey) {
let fromView = fromVC.view
let toView = toVC.view
let containerView = transitionContext.containerView()
var directionUpwardMultiplier: CGFloat = 1.0
if let vcs = tabBarController.viewControllers as? [UIViewController],
let fIndex = find(vcs, fromVC),
let tIndex = find(vcs, toVC) {
directionUpwardMultiplier = (fIndex < tIndex) ? +1.0 : -1.0
}
containerView.clipsToBounds = false
containerView.addSubview(toView)
var fromViewEndFrame = fromView.frame
fromViewEndFrame.Origin.y -= (containerView.frame.height * directionUpwardMultiplier)
let toViewEndFrame = transitionContext.finalFrameForViewController(toVC)
var toViewStartFrame = toViewEndFrame
toViewStartFrame.Origin.y += (containerView.frame.height * directionUpwardMultiplier)
toView.frame = toViewStartFrame
toView.alpha = 0.0
UIView.animateWithDuration(transitionDuration(transitionContext), delay: 0.0, usingSpringWithDamping: 1.0, initialSpringVelocity: 0.0, options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in
toView.alpha = 1.0
toView.frame = toViewEndFrame
fromView.alpha = 0.0
fromView.frame = fromViewEndFrame
}, completion: { (completed) -> Void in
toView.alpha = 1.0
fromView.removeFromSuperview()
transitionContext.completeTransition(completed)
containerView.clipsToBounds = true
})
}
}
}
Container ViewControllerで：
extension XYViewController: UITabBarControllerDelegate {
func tabBarController(tabBarController: UITabBarController, animationControllerForTransitionFromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return TabScrollPageAnimationController(tabBarController: tabBarController)
}
}
ここに私のSwift 3ソリューション：
UITabBarViewControllerのselectedIndexを次のようにオーバーライドします。
override var selectedIndex: Int{
get{
return super.selectedIndex
}
set{
animateToTab(toIndex: newValue)
super.selectedIndex = newValue
}
}
次に、ネイティブのプッシュ/ポップアニメーションを模倣するこの関数を使用します。
func animateToTab(toIndex: Int) {
guard let tabViewControllers = viewControllers, tabViewControllers.count > toIndex, let fromViewController = selectedViewController, let fromIndex = tabViewControllers.index(of: fromViewController), fromIndex != toIndex else {return}
view.isUserInteractionEnabled = false
let toViewController = tabViewControllers[toIndex]
let Push = toIndex > fromIndex
let bounds = UIScreen.main.bounds
let offScreenCenter = CGPoint(x: fromViewController.view.center.x + bounds.width, y: toViewController.view.center.y)
let partiallyOffCenter = CGPoint(x: fromViewController.view.center.x - bounds.width*0.25, y: fromViewController.view.center.y)
if Push{
fromViewController.view.superview?.addSubview(toViewController.view)
toViewController.view.center = offScreenCenter
}else{
fromViewController.view.superview?.insertSubview(toViewController.view, belowSubview: fromViewController.view)
toViewController.view.center = partiallyOffCenter
}
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: .curveEaseIn, animations: {
toViewController.view.center = fromViewController.view.center
fromViewController.view.center = Push ? partiallyOffCenter : offScreenCenter
}, completion: { finished in
fromViewController.view.removeFromSuperview()
self.view.isUserInteractionEnabled = true
})
}
私はそれが役立つことを願っています:)
タップされたアイテムに応じてアニメーション化できます-この例では、タップされたインデックスが前の選択されたインデックスよりも大きい場合はflipFromLeftを、タップされたインデックスが前の選択されたインデックスよりも小さい場合はflipFromRightをフリップします。これはSwift 4：UITabBarControllerDelegateメソッドを実装します
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
let fromView: UIView = tabBarController.selectedViewController!.view
let toView: UIView = viewController.view
if fromView == toView {
return false
}
if let tappedIndex = tabBarController.viewControllers?.index(of: viewController) {
if tappedIndex > tabBarController.selectedIndex {
UIView.transition(from: fromView, to: toView, duration: 0.5, options: UIViewAnimationOptions.transitionFlipFromLeft, completion: nil)
} else {
UIView.transition(from: fromView, to: toView, duration: 0.5, options: UIViewAnimationOptions.transitionFlipFromRight, completion: nil)
}
}
return true
}
これは2つの方法で解決できます
1-これをAppDelegate.mファイルに1回書き込みます。AppDelegate.hでコロン（:)の後に<>を使用してUITabBarControllerDelegateを含めることを忘れないでください
-(void)tabBarController:(UITabBarController *)tabBarControllerThis didSelectViewController:(UIViewController *)viewController
{
[UIView transitionWithView:viewController.view
duration:0.1
options:UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionTransitionCrossDissolve
animations:^(void){
} completion:^(BOOL finished){
[UIView beginAnimations:@"animation" context:nil];
[UIView setAnimationDuration:0.7];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft
forView:viewController.view
cache:NO];
[UIView commitAnimations];
}];
}
2-各ViewController.mファイルにこれを記述
-(void)viewWillAppear:(BOOL)animated
{
[UIView transitionWithView:self.view
duration:1.0
options:UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionTransitionCrossDissolve
animations:^(void){
[super viewWillAppear:YES];
} completion:^(BOOL finished){
}];
}
この助けを願っています...！
びくびくしたアニメーションの修正...
UIView * fromView = self.view.superview;
drekkaの答えは本当に素晴らしいです。スクロール遷移を少し調整して、アニメーションがAppleのプッシュアニメーションのように見えるようにしました。最初のアニメーションの完了時に追加のアニメーションを追加して、そのスライド効果が正しく見えるようにしました。
// Disable interaction during animation to avoids bugs.
self.tabBarController.view.userInteractionEnabled = NO;
// Get the views.
UIView * fromView = tabBarController.selectedViewController.view;
UIView * toView = [[tabBarController.viewControllers objectAtIndex:controllerIndex] view];
// Get the size of the view area.
CGRect viewSize = fromView.frame;
BOOL scrollRight = controllerIndex > tabBarController.selectedIndex;
// Add the to view to the tab bar view.
[fromView.superview addSubview:toView];
[fromView.superview addSubview:fromView];
self.tabBarController.selectedIndex = 0;
// Position it off screen.
toView.frame = CGRectMake((scrollRight ? (viewSize.size.width *.25) : -(viewSize.size.width * .25 )), viewSize.Origin.y, viewSize.size.width, viewSize.size.height);
[UIView animateWithDuration:0.25
animations: ^{
// Animate the views on and off the screen.
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
fromView.frame = CGRectMake(viewSize.size.width * .95, viewSize.Origin.y, viewSize.size.width, viewSize.size.height);
toView.frame = CGRectMake((viewSize.Origin.x * .90), viewSize.Origin.y, viewSize.size.width, viewSize.size.height);
}
completion:^(BOOL finished) {
if (finished) {
// Being new animation.
[UIView animateWithDuration:0.2
animations: ^{
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
fromView.frame = CGRectMake(viewSize.size.width, viewSize.Origin.y, viewSize.size.width, viewSize.size.height);
toView.frame = CGRectMake((viewSize.Origin.x), viewSize.Origin.y, viewSize.size.width, viewSize.size.height);
}
completion:^(BOOL finished) {
if (finished) {
// Remove the old view from the tabbar view.
[fromView removeFromSuperview];
// Restore interaction.
self.tabBarController.view.userInteractionEnabled = YES;
}
}];
}
}];
@ samwizeの答え Swift 5：
すべてのタブの変更にアニメーションを含める場合は、UITabBarControllerDelegateを使用してこのメソッドを実装します。
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
let tabViewControllers = tabBarController.viewControllers!
guard let toIndex = tabViewControllers.indexOf(value:viewController) else {
return false
}
animateToTab(toIndex: toIndex, fadeOutFromView: false, fadeInToView: false)
return true
}
animateToTabを呼び出して、アニメーションでタブをプログラムで変更します。
func animateToTab(toIndex: Int, fadeOutFromView: Bool, fadeInToView: Bool) {
let tabViewControllers = viewControllers!
let fromView = selectedViewController!.view
let toView = tabViewControllers[toIndex].view
let fromIndex = tabViewControllers.indexOf(value:selectedViewController!)
guard 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.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
if fadeInToView {
toView!.alpha = 0.1
}
UIView.animate(withDuration: 0.5, delay: 0.0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: [.curveEaseOut], animations: {
if fadeOutFromView {
fromView!.alpha = 0.0
}
if fadeInToView {
toView!.alpha = 1.0
}
// 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
})
}
@ -samwizeアンサーはSwift-に翻訳されています。これは2つ親指を立てて、左から右へのページ効果を作成します。
func animateToTab(toIndex: Int) {
let tabViewControllers = viewControllers!
let fromView = selectedViewController!.view
let toView = tabViewControllers[toIndex].view
let fromIndex = tabViewControllers.index(of: selectedViewController!)
guard 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 = screenSize.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: 0.5, delay: 0.0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: UIViewAnimationOptions.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
})
}
ボタンを押すと、2つの子View Controller間でフリップトランジションを使用したかったので、次のようにしました。
-(IBAction)flipViewControllers:(id)sender{
NSUInteger index = self.selectedIndex;
index++;
if(index >= self.childViewControllers.count){
index = 0;
}
self.selectedIndex = index;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.75];
[UIView setAnimationTransition:index % 2 ? UIViewAnimationTransitionFlipFromLeft : UIViewAnimationTransitionFlipFromRight
forView:self.view
cache:YES];
[UIView commitAnimations];
}
また、背景色を黒に設定します。私の場合は、navigationController.view.backgroundColorを設定することで行いましたが、アプリのデリゲートで簡単に設定できるwindow.backgroundColorの場合もあります。
タブ間の遷移をアニメーション化するための私の作業コード（つのタブの場合、これ以上試していない!!）です。これは主にdrekkaのソリューションに基づいていますが、すでにタブバーのデリゲートメソッドに実装されているため、コピー/貼り付けするだけで機能します。
-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
// Important! We validate that the selected tab is not the current tab, to avoid misplacing views
if (tabBarController.selectedViewController == viewController) {
return NO;
}
// Find the selected view's index
NSUInteger controllerIndex = 0;
for (UIViewController *vc in tabBarController.viewControllers) {
if (vc == viewController) {
controllerIndex = [tabBarController.viewControllers indexOfObject:vc];
}
}
CGFloat screenWidth = SCREEN_SIZE.width;
// Note: We must invert the views according to the direction of the scrolling ( FROM Left TO right or FROM right TO left )
UIView * fromView = tabBarController.selectedViewController.view;
UIView * toView = viewController.view;
[fromView.superview addSubview:toView];
CGRect fromViewInitialFrame = fromView.frame;
CGRect fromViewNewframe = fromView.frame;
CGRect toViewInitialFrame = toView.frame;
if ( controllerIndex > tabBarController.selectedIndex ) {
// FROM left TO right ( tab0 to tab1 or tab2 )
// The final frame for the current view. It will be displaced to the left
fromViewNewframe.Origin.x = -screenWidth;
// The initial frame for the new view. It will be displaced to the left
toViewInitialFrame.Origin.x = screenWidth;
toView.frame = toViewInitialFrame;
} else {
// FROM right TO left ( tab2 to tab1 or tab0 )
// The final frame for the current view. It will be displaced to the right
fromViewNewframe.Origin.x = screenWidth;
// The initial frame for the new view. It will be displaced to the right
toViewInitialFrame.Origin.x = -screenWidth;
toView.frame = toViewInitialFrame;
}
[UIView animateWithDuration:0.2 animations:^{
// The new view will be placed where the initial view was placed
toView.frame = fromViewInitialFrame;
// The initial view will be place outside the screen bounds
fromView.frame = fromViewNewframe;
tabBarController.selectedIndex = controllerIndex;
// To prevent user interaction during the animation
[[UIApplication sharedApplication] beginIgnoringInteractionEvents];
} completion:^(BOOL finished) {
// Before removing the initial view, we adjust its frame to avoid visual lags
fromView.frame = CGRectMake(0, 0, fromView.frame.size.width, fromView.frame.size.height);
[fromView removeFromSuperview];
[[UIApplication sharedApplication] endIgnoringInteractionEvents];
}];
return NO;
}
これはSwift 3：
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
if let fromView = tabBarController.selectedViewController?.view, let toView = viewController.view {
if fromView == toView {
return false
}
UIView.transition(from: fromView, to: toView, duration: 0.2, options: .transitionCrossDissolve) { (finished) in
}
}
return true
}