基于模态跳转

新建个项目

new一个新的vc扔在一边先不去管它好吧

屏幕快照 2017-11-03 下午2.45.24.png

现在之前的那个VC中放个按钮添加个target代码就不写了

下面是target代码：

-(void)next:(UIButton*)sender
{
    NextViewController* vc = [NextViewController new];
    vc.transitioningDelegate = self;
    [self presentViewController:vc animated:YES completion:^{
    }];
}

然后到我们新建的vc中写点东西,基本跟前一个VC没差

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor grayColor];
    UIButton* backVC = [UIButton buttonWithType:UIButtonTypeCustom];
    backVC.frame = CGRectMake(129, 250, 100, 44);
    backVC.layer.borderWidth = 1;
    [backVC setTitle:@"backVC" forState:UIControlStateNormal];
    [backVC setTitleColor:[UIColor blackColor]   forState:UIControlStateNormal];
    [backVC addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:backVC];
    // Do any additional setup after loading the view.
}

-(void)back:(UIButton*)sender{
    [self dismissViewControllerAnimated:YES completion:^{}];
}

效果：

11月-03-2017 14-55-14.gif

然后主要就是要把这个过场动画给改了

注意这两个方法：

-(nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source;
-(nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed;

这两个返回一个管理过场动画的对象，一个进一个回

先不管这个点话，新建一个类
MJAnimation基于NSObject。

在头文件中加个枚举用来选取跳转类型嘛

typedef NS_ENUM(NSInteger, AnimationType) {
    AnimationTypeValue1,
    AnimationTypeValue2,
};

@interface MJAnimation : NSObject<UIViewControllerAnimatedTransitioning,CAAnimationDelegate>
//可以理解为上下文
@property (strong , nonatomic) id < UIViewControllerContextTransitioning > transitionContext;
@property (assign , nonatomic) AnimationType type;
//判断是进是出
@property (assign ,nonatomic) BOOL isPush;
//你猜。。。。。
@property (assign , nonatomic) CGRect circleCenterRect;

实现文件

#import "MJAnimation.h"
#define kWindowH   [UIScreen mainScreen].bounds.size.height
#define kWindowW    [UIScreen mainScreen].bounds.size.width
@implementation MJAnimation
-(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
{
    return 0.5f;
}

-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    self.transitionContext = transitionContext;
    UIViewController* toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIViewController* fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    if (self.type == AnimationTypeValue1) {
        [self AnimationAnimationTypeValue1:transitionContext andToVC:toVC andFromVC:fromVC];
    }else if (self.type == AnimationTypeValue2)
    {
        [self AnimationAnimationTypeValue2:transitionContext andToVC:toVC andFromVC:fromVC];
    }
}

#pragma mark - CABasicAnimation的Delegate
- (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;
}

#pragma mark -- AnimationAnimationTypeValue1
-(void)AnimationAnimationTypeValue1:(id<UIViewControllerContextTransitioning>)transitionContext andToVC:(UIViewController*)toVC andFromVC:(UIViewController*)fromVC
{
    UIBezierPath *smallCircle =  [UIBezierPath bezierPathWithOvalInRect:_circleCenterRect];
    
    CGFloat centerX = self.circleCenterRect.origin.x + (self.circleCenterRect.size.width/2);
    CGFloat centerY = self.circleCenterRect.origin.y - (self.circleCenterRect.size.height/2);
    
    CGFloat circleR1 = (kWindowW - centerX) > centerX ? (kWindowW - centerX) : centerX;
    CGFloat circleR2 = (kWindowH - centerY) > centerY ? (kWindowH - centerY) :centerY;
    
    CGFloat radius = sqrt(circleR1 * circleR1 + circleR2 * circleR2);
    
    UIBezierPath *largeCircle = [UIBezierPath bezierPathWithOvalInRect:CGRectInset(self.circleCenterRect, -radius, -radius)];
    
    if (_isPush) {
        [[transitionContext containerView] addSubview:toVC.view];
        
        CAShapeLayer* shapeLayer = [CAShapeLayer layer];
        toVC.view.layer.mask = shapeLayer;
        shapeLayer.path = largeCircle.CGPath;
        
        CABasicAnimation*  shapeLayerAnimation = [CABasicAnimation animationWithKeyPath:@"path"];
        shapeLayerAnimation.fromValue = (__bridge id _Nullable)(smallCircle.CGPath);
        shapeLayerAnimation.toValue = (__bridge id _Nullable)(largeCircle.CGPath);
        shapeLayerAnimation.duration = [self transitionDuration:transitionContext ];
        shapeLayerAnimation.delegate = self;
        [shapeLayer addAnimation:shapeLayerAnimation forKey:@"path"];
    }else
    {
        [[transitionContext containerView] addSubview:toVC.view];
        [[transitionContext containerView] sendSubviewToBack:toVC.view];
        CAShapeLayer *shapeLayer = [CAShapeLayer layer];
        shapeLayer.path = smallCircle.CGPath;
        fromVC.view.layer.mask = shapeLayer;

        CABasicAnimation *shapeLayerAnimation = [CABasicAnimation animationWithKeyPath:@"path"];
        shapeLayerAnimation.fromValue = (__bridge id _Nullable)(largeCircle.CGPath);
        shapeLayerAnimation.toValue = (__bridge id _Nullable)((smallCircle.CGPath));
        shapeLayerAnimation.duration = [self transitionDuration:transitionContext];
        shapeLayerAnimation.delegate = self;
        [shapeLayer addAnimation:shapeLayerAnimation forKey:@"path"];
    }
}

之后去第一个vc中的那两个方法

//返回一个管理动画过渡的对象
-(nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
    if (!self.animations) {
        self.animations = [MJAnimation new];
    }
    self.animations.circleCenterRect = CGRectMake(0, 0, 10, 10);
    self.animations.type = AnimationTypeValue1;
    self.animations.isPush = YES;
    return self.animations;
}

- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{
    if(!self.animations){
        self.animations = [[MJAnimation alloc] init];
    }
    self.animations.type = AnimationTypeValue1;
    self.animations.isPush = NO;
    self.animations.circleCenterRect = CGRectMake(0, 0, 10, 10);
    return self.animations;
}

11月-03-2017 15-12-46.gif

然后之后再慢慢添加更多效果嘛。。。