部分代码 InteractiveTransition 类继承NSObject：
- (instancetype)initWithPresentingController:(UITableViewController *)presentingVc presentedController:(UIViewController *)presentedVc {
self = [super init];
if (self) {
self.vc = presentedVc;
self.vc.transitioningDelegate =self;
self.presentingVc = presentingVc;
}
return self;
}
- (void)new_scrollViewWillBeginDragging:(UIScrollView *)scrollView {
self.interactiveTransition = [[UIPercentDrivenInteractiveTransition alloc]init];
[self.presentingVc presentViewController:self.vc animated:YES completion:nil];
}
- (void)new_scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat offsetY = fabs(scrollView.contentOffset.y);
CGFloat screenH = [UIScreen mainScreen].bounds.size.height / 3.0;
progress = offsetY / screenH;
progress = progress-0.3;
if (progress > ) {
[self.interactiveTransition updateInteractiveTransition:progress];
}
}
- (void)new_scrollViewWillEndDragging {
if (progress < 0.4) {
[self.interactiveTransition cancelInteractiveTransition];
}else {
[self.interactiveTransition finishInteractiveTransition];
}
self.interactiveTransition = nil;
}
- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
return self.animation;
}
- (id<UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id<UIViewControllerAnimatedTransitioning>)animator {
return self.interactiveTransition;
}
PresentAnimation 类继承NSObject 实现 UIViewControllerAnimatedTransitioning协议
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
return 1.0;
}
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];
UIView *containerView = [transitionContext containerView];
[containerView addSubview:toView];
toView.frame = CGRectMake(, containerView.bounds.size.height, containerView.bounds.size.width - , containerView.bounds.size.height - );
[UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
toView.frame = containerView.bounds;
}completion:^(BOOL finished) {
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
}];
}
控制器：
- (InteractiveTransition *)interactive {
if (!_interactive) {
_interactive = [[InteractiveTransition alloc]initWithPresentingController:self presentedController:[[TwoViewController alloc]init]];
}
return _interactive;
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
[self.interactive new_scrollViewWillBeginDragging:scrollView];
}
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
[self.interactive new_scrollViewWillEndDragging];
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
[self.interactive new_scrollViewDidScroll:scrollView];
}
完整代码：http://pan.baidu.com/s/1i3Uewip