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像我們平常用的最多的就是presentViewController:animated:completion:和對(duì)應(yīng)的dismissViewControllerAnimated:completion:來實(shí)現(xiàn)展示視圖和隱藏視圖。最近看了官方的Demo,對(duì)于我這種小菜鳥著實(shí)下了一番功夫才搞明白。詳細(xì)代碼可以在這里下載，如果覺得有用,可以隨手star一下。

動(dòng)畫效果只實(shí)現(xiàn)了其中的一部分

Untitled.gif

第一個(gè)效果(Cross Dissolve)

. 1 首先當(dāng)前的控制器需要遵守UIViewControllerTransitioningDelegate點(diǎn)擊command進(jìn)去可以看到有5個(gè)代理方法，由于當(dāng)前的動(dòng)畫沒有涉及到用戶的交互情況，所以只實(shí)現(xiàn)了前兩個(gè)方法，它返回的是一個(gè)遵守了UIViewControllerAnimatedTransitioning的id對(duì)象，UIViewControllerAnimatedTransitioning它是用來控制動(dòng)畫的持續(xù)時(shí)間和展示邏輯。

#import <UIKit/UIKit.h>
@interface CrossDissolveAnimator : NSObject<UIViewControllerAnimatedTransitioning>
@end

#import "CrossDissolveAnimator.h"
@implementation CrossDissolveAnimator
//動(dòng)畫持續(xù)的時(shí)長
- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext{
    return 0.35;
}
//動(dòng)畫相關(guān)的參數(shù)
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext{
    //動(dòng)畫相關(guān)聯(lián)的兩個(gè)控制器
    UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    
    //containerView:本人理解是如果沒有動(dòng)畫，則為fromView,如果在動(dòng)畫的過程中，則為toView
    UIView *containerView = transitionContext.containerView;
    UIView *fromView;
    UIView *toView;
    
    //iOS8引入了viewForKey方法，系統(tǒng)會(huì)優(yōu)先訪問這個(gè)方法，另外viewForKey這個(gè)方法有可能會(huì)返回nil,盡量不直接訪問controller的view屬性，就比如第三個(gè)demo從底部彈出的動(dòng)畫，給presentedViewController的view添加了圓角陰影等效果，viewForKey訪問到的是所有的view 而presentedViewController的view只能訪問到其中的一個(gè)子視圖
    if ([transitionContext respondsToSelector:@selector(viewForKey:)]) {
        fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
        toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    }else{
        fromView = fromViewController.view;
        toView = toViewController.view;
    }
    
    fromView.frame = [transitionContext initialFrameForViewController:fromViewController];
    toView.frame = [transitionContext finalFrameForViewController:toViewController];
    
    fromView.alpha = 1.0f;
    toView.alpha = 0.0f;
    
    //在present和，dismiss時(shí)，必須將toview添加到視圖層次中
    [containerView addSubview:toView];
    NSTimeInterval transitionDurating = [self transitionDuration:transitionContext];
    [UIView animateWithDuration:transitionDurating animations:^{
        fromView.alpha = 0.0f;
        toView.alpha = 1.0f;
    } completion:^(BOOL finished) {
        BOOL wasCancelled = [transitionContext transitionWasCancelled];
        [transitionContext completeTransition:!wasCancelled];
    }];
}
@end

以上為核心的代碼，這里借用下別人的圖片來注明一下用到的fromView和toView

另外需要注意，modalPresentationStyle需要是UIModalPresentationFullScreen,full跟Custom的本質(zhì)區(qū)別是full會(huì)移除fromView,但是Custom卻不會(huì)。

第二個(gè)效果(Swipe)

首先先分析，它既可以點(diǎn)擊自定義跳轉(zhuǎn)，其次又可以添加手勢來滑動(dòng)，所以不僅要實(shí)現(xiàn)UIViewControllerTransitioningDelegate中的方法而且我們還要計(jì)算在手勢拖動(dòng)中百分比的控制，官方已經(jīng)封裝好了我們只需要實(shí)現(xiàn)UIPercentDrivenInteractiveTransition協(xié)議就好了。并且當(dāng)前的轉(zhuǎn)場動(dòng)畫是交互式的動(dòng)畫，判斷的依據(jù)就是可以手勢滑動(dòng)。
.1 自定義一個(gè)類遵守UIViewControllerTransitioningDelegate通過動(dòng)畫我們可以看出，當(dāng)present的時(shí)候是從屏幕的右邊開始，dismiss從左邊開始消失，所以我們要計(jì)算兩個(gè)toView的frame值
首先實(shí)現(xiàn)點(diǎn)擊Button來轉(zhuǎn)場

#import <UIKit/UIKit.h>
@interface SwipeTransitionAnimatar : NSObject<UIViewControllerAnimatedTransitioning>
@property(nonatomic,assign) UIRectEdge edge;//用來判斷是左滑還是右滑
- (instancetype)initWithTargetEdge:(UIRectEdge)dege;
@end

#import "SwipeTransitionAnimatar.h"

@implementation SwipeTransitionAnimatar
- (instancetype)initWithTargetEdge:(UIRectEdge)dege{
    if (self = [super init]) {
        _edge = dege;
    }
    return self;
}
- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext;
{
    return 0.35f;
}
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext{
    UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView *containerView = transitionContext.containerView;
    UIView *fromView;
    UIView *toView;
    if ([transitionContext respondsToSelector:@selector(viewForKey:)]) {
        fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
        toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    }else{
        fromView = fromViewController.view;
        toView = toViewController.view;
    }
    // isPresenting用于判斷當(dāng)前是present還是dismiss
    BOOL isPresenting = (toViewController.presentingViewController == fromViewController);
    
    CGRect fromFrame = [transitionContext initialFrameForViewController:fromViewController];
    CGRect toFrame = [transitionContext finalFrameForViewController:toViewController];
    
   __block  CGVector offset;//用于計(jì)算toView的位置
    //定義一個(gè)二維矢量運(yùn)動(dòng)的方向，重力方向默認(rèn)的是（0.f,1.f）,dx為-1.0f時(shí)向左運(yùn)動(dòng)，dy為-1.0時(shí)向上運(yùn)動(dòng)
     if (self.edge == UIRectEdgeLeft){
        offset = CGVectorMake(1.f, 0.f);//從左邊屏幕開始滑動(dòng)表示dismiss時(shí)
    }else if (self.edge == UIRectEdgeRight){
        offset = CGVectorMake(-1.f, 0.f);//從右邊開始滑動(dòng)表示present時(shí)
    }else{
        NSAssert(NO, @"targetEdge must be one of UIRectEdgeLeft, or UIRectEdgeRight.");
    }
    
    //根據(jù)當(dāng)前是present還是dismiss來計(jì)算好toView的初始位置以及結(jié)束位置
    if (isPresenting) {
        fromView.frame = fromFrame;
        toView.frame = CGRectOffset(toFrame, toFrame.size.width*offset.dx*-1, toFrame.size.height*offset.dy*-1);
    }else{
        fromView.frame = fromFrame;
        toView.frame = toFrame;
    }

    if (isPresenting) {
        [containerView addSubview:toView];
    }else{
        [containerView insertSubview:toView belowSubview:fromView];
    }
    NSTimeInterval transitionDurating = [self transitionDuration:transitionContext];
    [UIView animateWithDuration:transitionDurating animations:^{
        if (isPresenting) {
            toView.frame = toFrame;
        }else{
            fromView.frame = CGRectOffset(toFrame, toFrame.size.width*offset.dx, toFrame.size.height*offset.dy);
        }
    } completion:^(BOOL finished) {
       BOOL wasCancelled = [transitionContext transitionWasCancelled];
        if (wasCancelled)
            [toView removeFromSuperview];
        [transitionContext completeTransition:!wasCancelled];
    }];
}
@end

.2 自定義動(dòng)畫百分比控制器來實(shí)現(xiàn)手勢滑動(dòng)的時(shí)候所占的百分比

#import "SwipePercentInteractionController.h"

@interface SwipePercentInteractionController ()
@property(nonatomic,strong)id<UIViewControllerContextTransitioning> transitionContext;//用來存儲(chǔ)實(shí)時(shí)的transitionContext
@property(nonatomic,strong)UIScreenEdgePanGestureRecognizer *pan;
@property(nonatomic,assign) UIRectEdge edge;
@end

@implementation SwipePercentInteractionController
- (instancetype)initWithGestureRecognizer:(UIScreenEdgePanGestureRecognizer *)pan edgeForDragging:(UIRectEdge)edge{
    if (self = [super init]) {
        _pan = pan;
        _edge = edge;
        [_pan addTarget:self action:@selector(pan:)];
    }
    return self;
}
- (instancetype)init{
    @throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"Use -initWithGestureRecognizer:edgeForDragging:" userInfo:nil];
}
- (void)dealloc{
    [self.pan removeTarget:self action:@selector(pan:)];
}
//不應(yīng)該緩存transitionContext，而是動(dòng)態(tài)的獲取，這樣保證拿到的始終是最新的，最正確的消息
-(void)startInteractiveTransition:(id<UIViewControllerContextTransitioning>)transitionContext{
    self.transitionContext = transitionContext;
    [super startInteractiveTransition:transitionContext];
}
//根據(jù)當(dāng)前手勢觸摸的點(diǎn)從而計(jì)算出偏移的百分比
- (CGFloat)percentForGuesture:(UIScreenEdgePanGestureRecognizer *)pan{
    UIView *transitionContainerView = self.transitionContext.containerView;
    CGPoint location = [pan locationInView:transitionContainerView];
    CGFloat width = CGRectGetWidth(transitionContainerView.bounds);
    if (self.edge == UIRectEdgeLeft) {
        return location.x/width;
    }else if (self.edge == UIRectEdgeRight){
        return (width - location.x)/width;
    }else
        return 0.f;
}
//手勢滑動(dòng)觸發(fā)方法
- (void)pan:(UIScreenEdgePanGestureRecognizer *)pan{
    switch (pan.state) {
        case UIGestureRecognizerStateBegan:
            break;
        case UIGestureRecognizerStateChanged://手勢滑動(dòng)，更新百分比
            [self updateInteractiveTransition:[self percentForGuesture:pan]];
            break;
        case UIGestureRecognizerStateEnded: // 滑動(dòng)結(jié)束，判斷是否超過一半，如果是則完成剩下的動(dòng)畫，否則取消動(dòng)畫
            if ([self percentForGuesture:pan] >= 0.5f) {
                [self finishInteractiveTransition];
            }else{
                [self cancelInteractiveTransition];
            }
            break;
            
        default:
            [self cancelInteractiveTransition];
            break;
    }
}
@end

.3 實(shí)現(xiàn)UIViewControllerTransitioningDelegate代理方法

@implementation SwipeTransitioningDelegate

//   === 點(diǎn)擊Button的時(shí)候走下面這兩個(gè)方法  ===
- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source{
    return [[SwipeTransitionAnimatar alloc]initWithTargetEdge:self.edge];
}

- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{
    return [[SwipeTransitionAnimatar alloc]initWithTargetEdge:self.edge];
}

//=== 用手勢滑動(dòng)的時(shí)候走這兩個(gè)方法 ====
- (nullable id <UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id <UIViewControllerAnimatedTransitioning>)animator{
    if (self.pan) {
        return [[SwipePercentInteractionController alloc]initWithGestureRecognizer:self.pan edgeForDragging:self.edge];
    }
    else
        return nil;
}

- (nullable id <UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id <UIViewControllerAnimatedTransitioning>)animator{
    if (self.pan) {
        return [[SwipePercentInteractionController alloc]initWithGestureRecognizer:self.pan edgeForDragging:self.edge];
    }
    else
        return nil;
}

@end

第三個(gè)效果(Custom Presentation)

分析動(dòng)畫我們可以知道，presented出來的view自定義的有陰影，有圓角等而且frame并不是整個(gè)屏幕，這種比較徹底的自定義的presentedView我們可以使用轉(zhuǎn)場協(xié)調(diào)器UIPresentationController來實(shí)現(xiàn),它在轉(zhuǎn)場動(dòng)畫的執(zhí)行過程中一直存在。UIPresentationController具有以下的功能：
1.設(shè)置presentedViewController的視圖大小
2.添加自定義視圖來改變presentedView的外觀
3.為任何自定義的視圖提供轉(zhuǎn)場動(dòng)畫效果
4.根據(jù)size class進(jìn)行響應(yīng)式布局
由于```UIPresentationController``是一個(gè)基類，所以我們需要自定義實(shí)現(xiàn)一個(gè)類來集成它。該類主要的四個(gè)方法,顧名思義，就是在轉(zhuǎn)場動(dòng)畫將要開始(在這里定義視圖層級(jí)結(jié)構(gòu)和frame)，開始，將要結(jié)束,結(jié)束時(shí)的操作。

- (void)presentationTransitionWillBegin;
- (void)presentationTransitionDidEnd:(BOOL)completed;
- (void)dismissalTransitionWillBegin;
- (void)dismissalTransitionDidEnd:(BOOL)completed;

#import "CustomPresentatitionTransitioning.h"

@interface CustomPresentatitionTransitioning ()<UIViewControllerAnimatedTransitioning>
@property(nonatomic,strong)UIView *dimmingView;//后面的視圖遮罩
@property(nonatomic,strong)UIView *presentationWrappingView;//添加動(dòng)畫效果的view
@end

@implementation CustomPresentatitionTransitioning
//  =============  UIPresentationController初始化 方法 ==================
- (instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController{
    if (self = [super initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController]) {
        //Custom不會(huì)移除presentingView
        presentedViewController.modalPresentationStyle = UIModalPresentationCustom;
    }
    return self;
}
- (UIView *)presentedView{
    return self.presentationWrappingView;
}
//轉(zhuǎn)場將要開始的時(shí)候，布局視圖的層級(jí)結(jié)構(gòu)和frame
- (void)presentationTransitionWillBegin{
    //可以更改自身的視圖層級(jí)，添加額外的效果(陰影，圓角)
    UIView *presentedViewControllerView = [super presentedView];
    presentedViewControllerView.autoresizingMask = UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
  
    /*運(yùn)行的效果是由三個(gè)View疊加在一起形成的效果層級(jí)關(guān)系是
     presentationWapperView(負(fù)責(zé)陰影)
            presentationRoundedCornerView（負(fù)責(zé)圓角）
                   presentedViewControllerWrapperView
                         presentedViewControllerView
     
     */
    UIView *presentationWapperView = [[UIView alloc]initWithFrame:self.frameOfPresentedViewInContainerView];
    presentationWapperView.layer.shadowOpacity = 0.44f;//陰影不透明
    presentationWapperView.layer.shadowRadius = 13.f;
    presentationWapperView.layer.shadowOffset = CGSizeMake(0, -6.f);
    self.presentationWrappingView = presentationWapperView;
    
    UIView *presentationRoundedCornerView = [[UIView alloc]initWithFrame:UIEdgeInsetsInsetRect(presentationWapperView.bounds, UIEdgeInsetsMake(0, 0, -16, 0))];
    presentationRoundedCornerView.autoresizingMask =  UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
    presentationRoundedCornerView.layer.cornerRadius = 16;
    presentationRoundedCornerView.layer.masksToBounds = YES;
    
    UIView *presentedViewControllerWrapperView = [[UIView alloc]initWithFrame:UIEdgeInsetsInsetRect(presentationRoundedCornerView.bounds, UIEdgeInsetsMake(0, 0, 16, 0))];
    presentedViewControllerWrapperView.autoresizingMask = UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
    presentedViewControllerView.frame = presentedViewControllerWrapperView.bounds;
    //層級(jí)關(guān)系
    [presentationWapperView addSubview:presentationRoundedCornerView];
    [presentationRoundedCornerView addSubview:presentedViewControllerWrapperView];
    [presentedViewControllerWrapperView addSubview:presentedViewControllerView];
    
    //添加一個(gè)dimmingview(昏暗)在presentationWrapperView的后面，然后再添加self.presentedView 這樣的話dimmingview都出現(xiàn)在presentedView的后面
    UIView *dimmingView = [[UIView alloc]initWithFrame:self.containerView.bounds];
    dimmingView.backgroundColor = [UIColor blackColor];
    dimmingView.opaque = NO;//透明
    dimmingView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    [dimmingView addGestureRecognizer:[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)]];
    self.dimmingView = dimmingView;
    [self.containerView addSubview:dimmingView];
    
    
    id <UIViewControllerTransitionCoordinator> transitionCoordinator = self.presentingViewController.transitionCoordinator;
    self.dimmingView.alpha = 0.f;
    [transitionCoordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
        self.dimmingView.alpha = 0.5;
    } completion:nil];
}
//轉(zhuǎn)場完成時(shí)清除多余的視圖
- (void)presentationTransitionDidEnd:(BOOL)completed{
    //如果present沒有完成，把dimmingView和wrappingView都清空，這些臨時(shí)視圖用不到了
    if (completed == NO) {
        self.presentationWrappingView = nil;
        self.dimmingView = nil;
    }
}
- (void)dismissalTransitionWillBegin{
    id <UIViewControllerTransitionCoordinator> transitionCoordinator = self.presentingViewController.transitionCoordinator;
    [transitionCoordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
        self.dimmingView.alpha = 0.f;
    } completion:nil];
}
- (void)dismissalTransitionDidEnd:(BOOL)completed{
    if (completed) {
        self.presentationWrappingView = nil;
        self.dimmingView = nil;
    }
}
// =============  如果當(dāng)前DidChange的視圖是presentedViewController,UIContentContainer重新布局子視圖 ==========
- (void)preferredContentSizeDidChangeForChildContentContainer:(id<UIContentContainer>)container{
    [super preferredContentSizeDidChangeForChildContentContainer:container];
    if (container == self.presentedViewController) {
        [self.containerView setNeedsLayout];
    }
}
- (CGSize)sizeForChildContentContainer:(id<UIContentContainer>)container withParentContainerSize:(CGSize)parentSize{
    if (container == self.presentedViewController) {
        return ((UIViewController *)container).preferredContentSize;
    }else
        return [super sizeForChildContentContainer:container withParentContainerSize:parentSize];
    
}
//重寫系統(tǒng)方法計(jì)算presentedViewController的大小
- (CGRect)frameOfPresentedViewInContainerView{
    CGRect containerViewBounds = self.containerView.bounds;
    CGSize presentedViewContentSize = [self sizeForChildContentContainer:self.presentedViewController withParentContainerSize:containerViewBounds.size];
    
    CGRect presentedViewControllerFrame = CGRectMake(containerViewBounds.origin.x, CGRectGetMaxY(containerViewBounds) - presentedViewContentSize.height, presentedViewContentSize.width, presentedViewContentSize.height);
    return presentedViewControllerFrame;
}

- (void)containerViewWillLayoutSubviews{
    [super containerViewWillLayoutSubviews];
    self.dimmingView.frame = self.containerView.bounds;
    self.presentationWrappingView.frame = self.frameOfPresentedViewInContainerView;
}

- (IBAction)tap:(UITapGestureRecognizer *)tap{
    
    [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
}

@end

總結(jié)：

其實(shí)實(shí)現(xiàn)自定義轉(zhuǎn)場動(dòng)畫無非就是以下幾步：
1.設(shè)置將要跳轉(zhuǎn)的目的控制器presentedViewController的transitationingDelegate
2.充當(dāng)代理的對(duì)象可以是 self(比較簡單的動(dòng)畫)也可以是自定義的一個(gè)實(shí)現(xiàn)了UIViewControllerTransitioningDelegate的類。
3.在2的該類中實(shí)現(xiàn)指定的代理方法返回對(duì)應(yīng)的Animater,Animater是實(shí)現(xiàn)了UIViewControllerAnimatedTransitioning的對(duì)象，轉(zhuǎn)場動(dòng)畫的所有的核心代碼都是在該Animater中實(shí)現(xiàn)

自定義動(dòng)畫還有很多需要學(xué)習(xí)研究的地方，遠(yuǎn)遠(yuǎn)不止這些，以上僅為自己總結(jié)的一點(diǎn)點(diǎn)心得。還有幾個(gè)轉(zhuǎn)場動(dòng)畫有時(shí)間繼續(xù)更新！

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iOS自定義轉(zhuǎn)場動(dòng)畫-1

iOS自定義轉(zhuǎn)場動(dòng)畫-1

第一個(gè)效果(Cross Dissolve)

第二個(gè)效果(Swipe)

第三個(gè)效果(Custom Presentation)

總結(jié)：

相關(guān)閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

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iOS自定義轉(zhuǎn)場動(dòng)畫-1

第一個(gè)效果(Cross Dissolve)

第二個(gè)效果(Swipe)

第三個(gè)效果(Custom Presentation)

總結(jié)：

相關(guān)閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

色偷偷精品伊人,欧洲久久精品,欧美综合婷婷骚逼,国产AV主播,国产最新探花在线,九色在线视频一区,伊人大交九欧美,1769亚洲,黄色成人av