上一篇文章介紹了三種簡(jiǎn)單的轉(zhuǎn)場(chǎng)動(dòng)畫,全部代碼在這里
這里說(shuō)另外兩種
第一種動(dòng)畫(AdaptivePresentation)
其實(shí)乍一看這個(gè)從底部彈出來(lái)的感覺不就是Modal么，對(duì)，沒錯(cuò)，用Modal可以很簡(jiǎn)單的實(shí)現(xiàn)。但是既然說(shuō)自定義，那就看看是怎么自定義出來(lái)的。附圖Modal的效果，在目標(biāo)控制器插入一個(gè)NavigationController就能實(shí)現(xiàn)了。
首先目標(biāo)控制器要遵循UIAdaptivePresentationControllerDelegate協(xié)議
- (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];
}
說(shuō)個(gè)插曲，由于用的是storyboard拖線的，這個(gè)時(shí)候要選擇Custom的
但是如果直接選擇Custom的話會(huì)報(bào)以下錯(cuò)誤，讓你重寫- perform方法
#import <UIKit/UIKit.h>
@interface AdaptiveStoryboardSegue : UIStoryboardSegue
@end
#import "AdaptiveStoryboardSegue.h"
#import "AdaptivePresentationController.h"
@implementation AdaptiveStoryboardSegue
//如果沒有實(shí)現(xiàn)transitioningDelegate 此時(shí)不會(huì)報(bào)錯(cuò)，但是呈現(xiàn)出來(lái)的效果跟Modal出來(lái)的一樣
- (void)perform {
UIViewController *sourceController = self.sourceViewController;//官方的demo這里是destinationViewController,但是結(jié)果沒有影響
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義轉(zhuǎn)場(chǎng)動(dòng)畫的套路是一樣的，主要的代碼還是在UIViewControllerAnimatedTransitioning里面，在源碼里面我寫了很多注釋，就不一一在這里說(shuō)明了。
說(shuō)個(gè)小技巧，可以看出我在secondViewController寫的是
[self performSegueWithIdentifier:@"backtoFirstViewController" sender:sender];
但是可以在storyboard里面并沒有看到有Segue的連線，只有跳轉(zhuǎn)到secondViewController的連線，那么是怎么讓它跳轉(zhuǎn)回去的呢？
點(diǎn)擊secondViewController，我們可以看到這樣
有一根Segue并且有一個(gè)identifier和action，那么這個(gè)事件是怎么回事的呢？原來(lái)這個(gè)事件是寫在源控制器里的
//這個(gè)方法并不是隨便添加的，而是為了在secondViewController的Exit連接事件的時(shí)候有這個(gè)action，就可以返回到當(dāng)前的控制器
- (IBAction)backtoFirstViewController:(UIStoryboardSegue *)sender{
}
然后點(diǎn)擊secondViewController的Exit就可以看到這樣方法，把這個(gè)方法連線到secondViewController上就可以了。
第二種動(dòng)畫(Checkboard)
第二個(gè)動(dòng)畫思路是：在containerView上面有一層黑色的view，按照某一個(gè)固定的尺寸切割等分，然后雙層嵌套循環(huán)創(chuàng)建很多個(gè)view添加到當(dāng)前的黑色的view 。然后計(jì)算出哪些view將要3D旋轉(zhuǎn)。
可以看出是對(duì)系統(tǒng)本身的UINavigationController的動(dòng)畫做了自定義
查了一些資料，navigation controller有一個(gè)方法，代理來(lái)檢索有沒有animator objec對(duì)象來(lái)作用在傳入的試圖控制器上，如果這個(gè)方法實(shí)現(xiàn)了，將返回一個(gè)遵守了UIViewControllerAnimatedTransitioning協(xié)議的對(duì)象 如果沒有的話就默認(rèn)是push或者pop動(dòng)畫,這個(gè)方法就是
- (nullable id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
animationControllerForOperation:(UINavigationControllerOperation)operation
fromViewController:(UIViewController *)fromVC
toViewController:(UIViewController *)toVC{
}
返回的是一個(gè)遵守UIViewControllerAnimatedTransitioning協(xié)議的對(duì)象，主要的代碼還是在這里面，但是有一段代碼看的我整個(gè)人都不好了，求 大神指教
//計(jì)算當(dāng)前正在飛行的片數(shù) 從這里開始整個(gè)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];
}
}];
}
}
