iOS如何自定義轉場(chǎng)動(dòng)畫(huà)

這篇文章給大家分享的是有關(guān)iOS如何自定義轉場(chǎng)動(dòng)畫(huà)的內容。小編覺(jué)得挺實(shí)用的，因此分享給大家做個(gè)參考，一起跟隨小編過(guò)來(lái)看看吧。

預備

首先，我們現在介紹幾個(gè)在自定義轉場(chǎng)動(dòng)畫(huà)時(shí)需要接觸的協(xié)議：

UIViewControllerAnimatedTransitioning： 實(shí)現此協(xié)議的實(shí)例控制轉場(chǎng)動(dòng)畫(huà)效果。UIViewControllerInteractiveTransitioning： 實(shí)現此協(xié)議的實(shí)例控制著(zhù)利用手勢過(guò)渡時(shí)的進(jìn)度處理。

我們在定義好了實(shí)現上面兩個(gè)協(xié)議的類(lèi)后，只需要在需要進(jìn)行轉場(chǎng)的地方，提供對應的對象即可。

ps：下面的實(shí)例中，請大家忽略動(dòng)畫(huà)效果，關(guān)注實(shí)現。(其實(shí)是懶得去寫(xiě)太多動(dòng)畫(huà)了。??♂?)

模態(tài)跳轉（Present）

場(chǎng)景

self.present(vc!, animated: true) {}self.dismiss(animated: true) {}

實(shí)現步驟

1. 設置將要 present 的 ViewController 的 transitioningDelegate 對象，此對象是實(shí)現協(xié)議 UIViewControllerTransitioningDelegate 的實(shí)例。實(shí)現 UIViewControllerTransitioningDelegate 協(xié)議中的幾個(gè)代理方法，返回實(shí)現了 UIViewControllerAnimatedTransitioning 協(xié)議的動(dòng)畫(huà)效果控制類(lèi)。

需要實(shí)現的UIViewControllerTransitioningDelegate方法：

//返回用于 present 的自定義 transition 動(dòng)畫(huà)optional func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning?//返回用于 dismiss 的自定義 transition 動(dòng)畫(huà)optional func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning?

實(shí)例

/// 第一個(gè) VC 中點(diǎn)擊跳轉func presentClick(_ sender: Any) {  let vc = self.storyboard?.instantiateViewController(withIdentifier: "PresentSecondViewController")  vc?.modalPresentationStyle = .fullScreen  vc?.transitioningDelegate = self  self.present(vc!, animated: true) {}}// 第一個(gè) VC 實(shí)現協(xié)議，返回控制轉場(chǎng)動(dòng)畫(huà)效果的實(shí)例extension PresentFirstViewController: UIViewControllerTransitioningDelegate { func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {  return NormalPresentAnimator() } func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {  return NormalPresentAnimator() }}

導航控制器跳轉（Push）

場(chǎng)景

self.navigationController?.pushViewController(vc!, animated: true)self.navigationController?.popViewController(animated: true)

實(shí)現步驟

1. 設置導航控制器 UINavigationController 的 delegate。實(shí)現 UINavigationControllerDelegate 協(xié)議中的代理方法，返回實(shí)現了 UIViewControllerAnimatedTransitioning 協(xié)議的動(dòng)畫(huà)效果控制類(lèi)。

需要實(shí)現的UINavigationControllerDelegate方法：

optional func navigationController(_ navigationController: UINavigationController,        animationControllerFor operation: UINavigationController.Operation,        from fromVC: UIViewController,        to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning?

實(shí)例

class PushFirstViewController: UIViewController { override func viewDidLoad() {  super.viewDidLoad()  self.navigationController?.delegate = self } @IBAction func pushClick(_ sender: Any) {  let vc = self.storyboard?.instantiateViewController(withIdentifier: "PushSecondViewController")  self.navigationController?.pushViewController(vc!, animated: true) }}extension PushFirstViewController: UINavigationControllerDelegate { //返回自定義過(guò)渡動(dòng)畫(huà) func navigationController(_ navigationController: UINavigationController,        animationControllerFor operation: UINavigationController.Operation,        from fromVC: UIViewController,        to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {  if operation == .pop && fromVC is PushFirstViewController {   return nil  }  return NormalPushAnimator() }}

UITabbarController

在前面的兩個(gè)專(zhuān)場(chǎng)實(shí)現中，我們在需要轉場(chǎng)的類(lèi)中分別實(shí)現了UIViewControllerTransitioningDelegate 及 UINavigationControllerDelegate 方法，在這兩個(gè)協(xié)議中，還有這樣幾個(gè)方法：

/// UIViewControllerTransitioningDelegateoptional func interactionControllerForPresentation(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning?optional func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning?/// UINavigationControllerDelegateoptional func navigationController(_ navigationController: UINavigationController,          interactionControllerFor animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning?

上面這幾個(gè)方法呢？其實(shí)就是我們通過(guò)利用手勢轉場(chǎng)時(shí)過(guò)渡的進(jìn)度處理方法。我們需要在代理方法中返回一個(gè)實(shí)現了 UIViewControllerInteractiveTransitioning 協(xié)議的對象來(lái)對轉場(chǎng)進(jìn)度進(jìn)行控制。下面的 UITabbarController 中我就實(shí)現一個(gè)利用手勢控制轉場(chǎng)的例子。 Present 及 Push/Pop 按照相同的思路實(shí)現即可。

場(chǎng)景

UITabbarController 在默認的狀態(tài)下，切換控制器時(shí)是沒(méi)有動(dòng)畫(huà)效果的。如果需要動(dòng)畫(huà)效果的話(huà)，需要我們進(jìn)行自定義。

實(shí)現步驟

1. 設置 UITabbarController 的 delegate。實(shí)現 UITabBarControllerDelegate 協(xié)議中的代理方法，返回實(shí)現了 UIViewControllerAnimatedTransitioning 協(xié)議的動(dòng)畫(huà)效果控制類(lèi)，以及返回實(shí)現了 UIViewControllerInteractiveTransitioning 協(xié)議的轉場(chǎng)進(jìn)度控制類(lèi)。

/// 返回實(shí)現了 UIViewControllerAnimatedTransitioning 協(xié)議的實(shí)例func tabBarController(_ tabBarController: UITabBarController,       animationControllerForTransitionFrom fromVC: UIViewController,       to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning?/// 返回實(shí)現了 UIViewControllerInteractiveTransitioning 協(xié)議的實(shí)例func tabBarController(_ tabBarController: UITabBarController,       interactionControllerFor animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning?

實(shí)例

class TabbarController: UITabBarController, UITabBarControllerDelegate { override func viewDidLoad() {  super.viewDidLoad()  self.delegate = self}func tabBarController(_ tabBarController: UITabBarController,       animationControllerForTransitionFrom fromVC: UIViewController,       to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? { if self.selectedIndex == 0 {  return TabbarAnimator(edge: .right) } else {  return TabbarAnimator(edge: .left) }}func tabBarController(_ tabBarController: UITabBarController,       interactionControllerFor animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? { if self.panGesture.state == .began || self.panGesture.state == .changed {  return TabbarInteractionTransition(pan: self.panGesture) } else {  return nil }}

三方框架——Lottie

介紹

Lottie 是 Android 和 iOS 的移動(dòng)庫，用 bodymovin 解析 Adobe After Effects 導出為 json 的動(dòng)畫(huà)并在移動(dòng)設備上生成矢量動(dòng)畫(huà)。設計師可以輕松的創(chuàng )建漂亮(復雜)的動(dòng)畫(huà)，無(wú)需程序員辛苦地手動(dòng)去創(chuàng )建及調試。

場(chǎng)景

實(shí)現一些特殊的轉場(chǎng)，且程序員無(wú)足夠時(shí)間調試動(dòng)畫(huà)時(shí)。

實(shí)現步驟

1. 在工程中導入 Lottie 框架。在需要轉場(chǎng)的類(lèi)中，將 Lottie import。因為 Lottie 實(shí)現的轉場(chǎng)實(shí)際上是 Present 的轉場(chǎng)，所以設置將要 Present 的控制器的 transitioningDelegate。實(shí)現 UIViewControllerTransitioningDelegate 協(xié)議中的幾個(gè)代理方法，返回利用轉場(chǎng)動(dòng)畫(huà) json 文件初始化的 LOTAnimationTransitionController 的實(shí)例。

ps：Lottie 轉場(chǎng)的 LOTAnimationTransitionController 在 3.0.0 版本后被移除，所以需要使用 Lottie 做轉場(chǎng)時(shí)，需要在導入時(shí)，指定版本號為更早的版本。我這里使用的是 2.5.3。

實(shí)例

/// 第一個(gè) VCfunc presentClick(_ sender: Any) { let vc = self.storyboard?.instantiateViewController(withIdentifier: "LottieSecondViewController") vc?.transitioningDelegate = self self.present(vc!, animated: true) {}}/// 實(shí)現 UIViewControllerTransitioningDelegate，返回 LOTAnimationTransitionController 的實(shí)例extension LottieFirstViewController: UIViewControllerTransitioningDelegate { func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {  let transitionController = LOTAnimationTransitionController(animationNamed: "Count",                 fromLayerNamed: "",                 toLayerNamed: "",                 applyAnimationTransform: false)  return transitionController } func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {  let transitionController = LOTAnimationTransitionController(animationNamed: "Three",                 fromLayerNamed: "",                 toLayerNamed: "",                 applyAnimationTransform: false)  return transitionController }}