效果：

11月-09-2017 10-22-43.gif

主要用到了物理引擎敢订。

新建動畫類MJAinimationRect
在頭文件中聲明下面兩個屬性，一個是動畫上下文，一個是物理引擎

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface MJAnimationRect : NSObject<UIViewControllerAnimatedTransitioning,UICollisionBehaviorDelegate>
@property (strong , nonatomic) id < UIViewControllerContextTransitioning > transitionContext;
@property (nonatomic, strong) UIDynamicAnimator *animator;
@end

在實現(xiàn)文件中完成兩個代理相對應(yīng)該實現(xiàn)的代理方法

動畫過度時間孤荣，直接返回時間值

-(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
{
    return 2.0f;
}

之后準備實現(xiàn)動畫效果，代碼如下
1.通過上下文獲取跳轉(zhuǎn)的view
2.將fromVC截圖
3.調(diào)用cutView方法將截圖切成4*5點格子并添加到當前的containerView上
4.添加之前隨機對切圖進行微角度旋轉(zhuǎn)须揣，以增加動畫效果
5.獲取目標view并添加到界面盐股，置于頁面底部，暫時先把他的alpha置為0
6.添加作用力
7.設(shè)置碰撞檢測

-(void)AnimationAnimationType:(id<UIViewControllerContextTransitioning>)transitionContext andToVC:(UIViewController*)toVC andFromVC:(UIViewController*)fromVC
{
    UIView *containerView = [transitionContext containerView];
    UIView *mainSnap = [fromVC.view snapshotViewAfterScreenUpdates:NO];
    NSMutableArray* cutViewArray = [self cutView:mainSnap intoSlicesOfWidth:mainSnap.frame.size.width/kwidthCount andHeight:mainSnap.frame.size.height/kHeightCount];
    for (int i=0; i<cutViewArray.count; i++) {
        UIView* cutView = (UIView*)cutViewArray[i];
        
        CGFloat angle = (i% 2 ? 1 : -1) * (rand() % 5 / 10.0);
        cutView.transform = CGAffineTransformMakeRotation(angle);
        [containerView addSubview:cutView];
    }
    UIView* toView = [toVC view];
    toView.frame = [transitionContext finalFrameForViewController:toVC];
    [containerView addSubview:toView];
    [containerView sendSubviewToBack:toView];
    toView.alpha = 0;
    
    //截圖已經(jīng)覆蓋fromView.view 所以可以直接隱藏返敬。
    fromVC.view.hidden = YES;

    self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:containerView];
    UIDynamicBehavior *behaviour = [[UIDynamicBehavior alloc] init];
    //為每個view添加重力
    UIGravityBehavior* gravity = [[UIGravityBehavior alloc] initWithItems:cutViewArray];
    gravity.gravityDirection = CGVectorMake(0, 1); // 方向
    gravity.magnitude = 5; //加速度
    // 碰撞檢測
    UICollisionBehavior *collision = [[UICollisionBehavior alloc] initWithItems:cutViewArray];
    // 設(shè)置不要出邊界遂庄，碰到邊界會被反彈
    collision.translatesReferenceBoundsIntoBoundary = YES;
    collision.collisionDelegate = self;
    //除了邊界碰撞沒有其他碰撞
    collision.collisionMode = UICollisionBehaviorModeBoundaries;
    [behaviour addChildBehavior:gravity];
    [behaviour addChildBehavior:collision];
    
    //每個view設(shè)置不同的動畫效果，添加到總的動作中去
    for (UIView *aView in cutViewArray) {
        UIDynamicItemBehavior *itemBehaviour = [[UIDynamicItemBehavior alloc] initWithItems:@[aView]];
        itemBehaviour.elasticity = (rand() % 5) / 8.0;
        itemBehaviour.density = (rand() % 5 / 3.0);
                itemBehaviour.allowsRotation = YES;
        [behaviour addChildBehavior:itemBehaviour];
    }
    [self.animator addBehavior:behaviour];
    
    [UIView animateWithDuration:2 animations:^{
        for (UIView *aView in cutViewArray) {
            aView.alpha = 0.0;
            toView.alpha = 1;
        }
    } completion:^(BOOL finished) {
        for (UIView *view in cutViewArray) {
            [view removeFromSuperview];
        }
        [cutViewArray removeAllObjects];
        fromVC.view.hidden = NO;
        [transitionContext completeTransition:YES];
    }];
    
}

-(NSMutableArray *)cutView:(UIView *)view intoSlicesOfWidth:(float)width andHeight:(float)height{
    NSMutableArray *lineViews = [NSMutableArray array];
    UIView *subsnapshot;
    for (int x=0; x<CGRectGetWidth(view.frame); x+=width) {
        for (int y=0;y<CGRectGetHeight(view.frame); y+=height) {
            CGRect subrect = CGRectMake(x, y, width, height);
            subsnapshot = nil;
            subsnapshot = [view resizableSnapshotViewFromRect:subrect afterScreenUpdates:YES withCapInsets:UIEdgeInsetsZero];
            subsnapshot.frame = subrect;
            [lineViews addObject:subsnapshot];
        }
    }
    return lineViews;
}

之后在另外一個代理方法中調(diào)用該方法

-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    self.transitionContext = transitionContext;
    UIViewController* toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIViewController* fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    [self AnimationAnimationType:transitionContext andToVC:toVC andFromVC:fromVC];
}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{
    [self.transitionContext completeTransition:![self.transitionContext transitionWasCancelled]];
    [self.transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view.layer.mask = nil;
    [self.transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view.layer.mask = nil;
}

調(diào)用方法劲赠，import 該類

實現(xiàn)以下方法即可

//返回一個管理動畫過渡的對象
-(nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
    if (!self.animationRect) {
        self.animationRect = [MJAnimationRect new];
    }
    return self.animationRect;
}

- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{
    if(!self.animationRect){
        self.animationRect = [[MJAnimationRect alloc] init];
    }
    return self.animationRect;
}