ios8自定義轉(zhuǎn)場動畫
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首先只能在iOS 8后使用
默認情況下modal會移除以前控制器的view, 替換為當(dāng)前彈出的view
如果自定義轉(zhuǎn)場, 那么就不會移除以前控制器的view
// vc是要被model的控制器
let vc = UIViewController()
// 設(shè)置轉(zhuǎn)場代理為當(dāng)前控制器
vc?.transitioningDelegate = self
// 設(shè)置轉(zhuǎn)場的樣式為自定義
vc?.modalPresentationStyle = UIModalPresentationStyle.custom
present(vc!, animated: true, completion: nil)
1.遵守UIViewControllerTransitioningDelegate協(xié)議瘦锹，實現(xiàn)協(xié)議方法列赎， 設(shè)置轉(zhuǎn)場樣式為自定義
@available(iOS 8.0, *)
optional public func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController?
2.要返回一個UIPresentationController,所以自頂一個類繼承UIPresentationController
class CustomPopoverPresentationController: UIPresentationController {
/**
初始化方法, 用于創(chuàng)建負責(zé)轉(zhuǎn)場動畫的對象
:param: presentedViewController 被展現(xiàn)的控制器
:param: presentingViewController 發(fā)起的控制器, Xocde6是nil, Xcode7是野指針
:returns: 負責(zé)轉(zhuǎn)場動畫的對象
*/
override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
}
/**
即將布局轉(zhuǎn)場子視圖時調(diào)用
*/
override func containerViewWillLayoutSubviews()
{
// presentedView 表示為彈出的視圖，containerView 表示容器view
// 1.修改彈出視圖的大小
presentedView?.frame = CGRect(x: 100, y: 56, width: 200, height: 200)
// 2.在容器視圖上添加一個蒙版, 插入到展現(xiàn)視圖的下面
containerView?.insertSubview(coverView, at: 0)
}
// MARK: - 懶加載
fileprivate lazy var coverView: UIView = {
// 1.創(chuàng)建view
let view = UIView()
view.backgroundColor = UIColor(white: 0.0, alpha: 0.2)
view.frame = UIScreen.main.bounds
// 2.添加監(jiān)聽
let tap = UITapGestureRecognizer(target: self, action: "close")
view.addGestureRecognizer(tap)
return view
}()
func close(){
// presentedViewController拿到當(dāng)前彈出的控制器
presentedViewController.dismiss(animated: true, completion: nil)
}
}
3.返回的UIPresentationController就用自定義類創(chuàng)建
func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController?
{
return CustomPopoverPresentationController(presentedViewController: presented, presenting: presenting)
}
4.實現(xiàn)協(xié)議中另外兩個方法來自定義動畫的實現(xiàn)
只要實現(xiàn)了以下方法, 那么系統(tǒng)自帶的默認動畫就沒有了, "所有"東西都需要程序員自己來實現(xiàn)
自定義一個isPresent表示是否model出來了
@available(iOS 2.0, *) // 即將彈出
optional public func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning?
@available(iOS 2.0, *) // 即將消失
optional public func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning?
/**
告訴系統(tǒng)誰來負責(zé)Modal的展現(xiàn)動畫
:param: presented 被展現(xiàn)視圖
:param: presenting 發(fā)起的視圖
:returns: 誰來負責(zé)
*/
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning?
{
isPresent = true
return self
}
/**
告訴系統(tǒng)誰來負責(zé)Modal的消失動畫
:param: dismissed 被關(guān)閉的視圖
:returns: 誰來負責(zé)
*/
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning?
{
isPresent = false
return self
}
5.由于UIViewControllerAnimatedTransitioning是協(xié)議沮焕，而設(shè)置了當(dāng)前控制器遵守協(xié)議幕帆，所以需要遵守協(xié)議實現(xiàn)方法岩榆，如下遵守UIViewControllerAnimatedTransitioning協(xié)議 窥翩，實現(xiàn)方法
public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval
// This method can only be a nop if the transition is interactive and not a percentDriven interactive transition.
public func animateTransition(using transitionContext: UIViewControllerContextTransitioning)
// 實現(xiàn)方法
// MARK: - UIViewControllerAnimatedTransitioning
/**
返回動畫時長
:param: transitionContext 上下文, 里面保存了動畫需要的所有參數(shù)
:returns: 動畫時長
*/
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval
{
return 0.5
}
/**
告訴系統(tǒng)如何動畫, 無論是展現(xiàn)還是消失都會調(diào)用這個方法
:param: transitionContext 上下文, 里面保存了動畫需要的所有參數(shù)
*/
func animateTransition(using transitionContext: UIViewControllerContextTransitioning)
{
// 1.拿到展現(xiàn)視圖
/*
let toVC = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)
let fromVC = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)
// 通過打印發(fā)現(xiàn)需要修改的就是toVC上面的View
print(toVC)
print(fromVC)
*/
if isPresent
{
// 展開
print("展開")
let toView = transitionContext.view(forKey: UITransitionContextViewKey.to)!
toView.transform = CGAffineTransform(scaleX: 1.0, y: 0.0);
// 注意: 一定要將視圖添加到容器上
transitionContext.containerView.addSubview(toView)
// 設(shè)置錨點
toView.layer.anchorPoint = CGPoint(x: 0.5, y: 0)
// 2.執(zhí)行動畫
UIView.animate(withDuration: 0.5, animations: { () -> Void in
// 2.1清空transform
toView.transform = CGAffineTransform.identity
}, completion: { (_) -> Void in
// 2.2動畫執(zhí)行完畢, 一定要告訴系統(tǒng)
// 如果不寫, 可能導(dǎo)致一些未知錯誤
transitionContext.completeTransition(true)
})
}else
{
// 關(guān)閉
print("關(guān)閉")
let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from)
UIView.animate(withDuration: 0.2, animations: { () -> Void in
// 注意:由于CGFloat是不準確的, 所以如果寫0.0會沒有動畫
// 壓扁
fromView?.transform = CGAffineTransform(scaleX: 1.0, y: 0.000001)
}, completion: { (_) -> Void in
// 如果不寫, 可能導(dǎo)致一些未知錯誤
transitionContext.completeTransition(true)
})
}
}
