iOS自定义转场动画-2

上一篇文章介绍了三种简单的转场动画,全部代码在这里
这里说另外两种

Untitled-1.gif
第一种动画(AdaptivePresentation)

其实乍一看这个从底部弹出来的感觉不就是Modal么,对,没错,用Modal可以很简单的实现。但是既然说自定义,那就看看是怎么自定义出来的。附图Modal的效果,在目标控制器插入一个NavigationController就能实现了。

Untitled-modal效果.gif

首先目标控制器要遵循UIAdaptivePresentationControllerDelegate协议

- (void)setTransitioningDelegate:(id<UIViewControllerTransitioningDelegate>)transitioningDelegate{
    [super setTransitioningDelegate:transitioningDelegate];
    self.presentationController.delegate = self;
}

#pragma mark-  UIAdaptivePresentationControllerDelegate
- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller{
    return UIModalPresentationFullScreen;
}
- (UIViewController *)presentationController:(UIPresentationController *)controller viewControllerForAdaptivePresentationStyle:(UIModalPresentationStyle)style{
    return [[UINavigationController alloc]initWithRootViewController:controller.presentedViewController];
}

说个插曲,由于用的是storyboard拖线的,这个时候要选择Custom
但是如果直接选择Custom的话会报以下错误,让你重写- perform方法

Snip20161101_4.png
#import <UIKit/UIKit.h>
@interface AdaptiveStoryboardSegue : UIStoryboardSegue
@end
#import "AdaptiveStoryboardSegue.h"
#import "AdaptivePresentationController.h"

@implementation AdaptiveStoryboardSegue
//如果没有实现transitioningDelegate 此时不会报错,但是呈现出来的效果跟Modal出来的一样
- (void)perform {
    UIViewController *sourceController = self.sourceViewController;//官方的demo这里是destinationViewController,但是结果没有影响
    UIViewController *desitinationController = self.destinationViewController;
    
    AdaptivePresentationController *presentationViewController = [[AdaptivePresentationController alloc]initWithPresentedViewController:desitinationController presentingViewController:sourceController];
    desitinationController.transitioningDelegate = presentationViewController;
    [sourceController presentViewController:desitinationController animated:YES completion:nil];
}
@end

其他的跟上一篇自定义转场动画的套路是一样的,主要的代码还是在UIViewControllerAnimatedTransitioning里面,在源码里面我写了很多注释,就不一一在这里说明了。
说个小技巧,可以看出我在secondViewController写的是

 [self performSegueWithIdentifier:@"backtoFirstViewController" sender:sender];

但是可以在storyboard里面并没有看到有Segue的连线,只有跳转到secondViewController的连线,那么是怎么让它跳转回去的呢?
![1.jpeg](http://upload-images.jianshu.io/upload_images/1851080-1ba0974e248c6ae7.jpeg?
![Uploading Snip20161103_6_731627.png . . .]
imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
点击secondViewController,我们可以看到这样

Snip20161103_6.png

有一根Segue并且有一个identifieraction,那么这个事件是怎么回事的呢?原来这个事件是写在源控制器里的

//这个方法并不是随便添加的,而是为了在secondViewController的Exit连接事件的时候有这个action,就可以返回到当前的控制器
- (IBAction)backtoFirstViewController:(UIStoryboardSegue *)sender{
    
}

然后点击secondViewControllerExit就可以看到这样方法,把这个方法连线到secondViewController上就可以了。

Snip20161103_7.png
第二种动画(Checkboard)

第二个动画思路是:在containerView上面有一层黑色的view,按照某一个固定的尺寸切割等分,然后双层嵌套循环创建很多个view添加到当前的黑色的view 。然后计算出哪些view将要3D旋转。
可以看出是对系统本身的UINavigationController的动画做了自定义
查了一些资料,navigation controller有一个方法,代理来检索有没有animator objec对象来作用在传入的试图控制器上,如果这个方法实现了,将返回一个遵守了UIViewControllerAnimatedTransitioning协议的对象 如果没有的话就默认是push或者pop动画,这个方法就是

- (nullable id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
                                            animationControllerForOperation:(UINavigationControllerOperation)operation
                                                         fromViewController:(UIViewController *)fromVC
                                                           toViewController:(UIViewController *)toVC{
    
}

返回的是一个遵守UIViewControllerAnimatedTransitioning协议的对象,主要的代码还是在这里面,但是有一段代码看的我整个人都不好了,求 大神指教

 //计算当前正在飞行的片数  从这里开始整个人懵逼了 看不懂
    __block NSUInteger sliceAnimationsPending = 0;
    for (NSInteger y = 0; y <verticalSlices; y ++) {
        for (NSInteger x = 0; x < horizontalSlices; x ++) {
           
            UIView *toCheckboardView = transitionContainer.subviews[y * horizontalSlices * 2 + (x * 2)];
            UIView *fromCheckboardView = transitionContainer.subviews[y * horizontalSlices * 2 + (x * 2 + 1)];
            CGVector sliceOriginVector;
            if (isPush) {
                sliceOriginVector = CGVectorMake(CGRectGetMinX(fromCheckboardView.frame) - CGRectGetMinX(transitionContainer.bounds),
                                                 CGRectGetMinY(fromCheckboardView.frame) - CGRectGetMinY(transitionContainer.bounds));
            }else{
                sliceOriginVector = CGVectorMake(CGRectGetMaxX(fromCheckboardView.frame) - CGRectGetMaxX(transitionContainer.bounds),
                                                 CGRectGetMaxY(fromCheckboardView.frame) - CGRectGetMaxY(transitionContainer.bounds));
            }
            
            CGFloat dot = sliceOriginVector.dx * transitionVector.dx + sliceOriginVector.dy * transitionVector.dy;
            CGVector projection = CGVectorMake(transitionUnitVector.dx * dot/transitionVectorLength,
                                               transitionUnitVector.dy * dot/transitionVectorLength);
            
            CGFloat projectionLength = sqrtf( projection.dx * projection.dx + projection.dy * projection.dy );
            
            NSTimeInterval startTime = projectionLength/(transitionVectorLength + transitionSpacing) * transitionDuration;
            NSTimeInterval duration = ( (projectionLength + transitionSpacing)/(transitionVectorLength + transitionSpacing) * transitionDuration ) - startTime;
            
            sliceAnimationsPending++;
            
            [UIView animateWithDuration:duration delay:startTime options:0 animations:^{
                toCheckboardView.layer.transform = CATransform3DIdentity;
                fromCheckboardView.layer.transform = CATransform3DMakeRotation(M_PI, 0, 1, 0);
            } completion:^(BOOL finished) {
            
                if (--sliceAnimationsPending == 0) {
                    BOOL wasCancelled = [transitionContext transitionWasCancelled];
                    [transitionContainer removeFromSuperview];
                    [transitionContext completeTransition:!wasCancelled];
                }
            }];

        }
    }
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