[英]iOS 7 Custom Transition: Will Not Animate
我希望您能对我有所帮助,我试图在我的应用程序中实现一个自定义过渡,该过渡将显示一个自定义模态视图控制器。 我能够使View Controller出现预期的效果,但是,我无法过渡到动画。 任何对此的帮助或指向正确方向的指针将不胜感激。
请在下面查看我的代码:
-(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{
return 1.0;
}
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
CGRect sourceRect = [transitionContext initialFrameForViewController:fromVC];
fromVC.view.frame = sourceRect;
UIGraphicsBeginImageContextWithOptions(fromVC.view.frame.size, NO, 0);
[fromVC.view drawViewHierarchyInRect:fromVC.view.bounds afterScreenUpdates:YES];
UIImage *fromVCImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIView *container = [transitionContext containerView];
[container setBackgroundColor:[UIColor colorWithPatternImage:fromVCImage]];
[container insertSubview:toVC.view belowSubview:fromVC.view];
CGRect fromVCFrame = fromVC.view.frame;
__block CGRect toVCFrame = toVC.view.frame;
toVCFrame.origin.y = fromVCFrame.origin.y + fromVCFrame.size.height;
[toVC.view setFrame:toVCFrame];
[toVC.view setAlpha:0.0];
[toVC.view setBackgroundColor:[UIColor colorWithPatternImage:fromVCImage]];
[transitionContext finalFrameForViewController:toVC];
//3.Perform the animation...............................
[UIView animateWithDuration:1.0
animations:^{
toVCFrame.origin.y = fromVCFrame.origin.y;
toVC.view.frame = toVCFrame;
[toVC.view setAlpha:1.0];
}
completion:^(BOOL finished) {
//When the animation is completed call completeTransition
[transitionContext completeTransition:YES];
}];
}
通过UITapGestureRecognizer调用presentViewController时,从View Controller添加代码
- (void) onTapGesture:(UITapGestureRecognizer *)recognizer
{
ImagesCollectionViewController *imagesCollectionView = [[Utils getStoryboardForDeviceWithIdentifier:MAIN_STORYBOARD] instantiateViewControllerWithIdentifier:IMAGES_VIEW];
imagesCollectionView.transitioningDelegate = self;
imagesCollectionView.modalTransitionStyle = UIModalPresentationCustom;
[self presentViewController:imagesCollectionView animated:YES completion:^{
}];
}
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
return self.contentSlideTransitionManager;
}
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
return self.contentSlideTransitionManager;
}
我猜这是您的问题:
[container insertSubview:toVC.view belowSubview:fromVC.view];
如果toVC.view
在 fromVC.view
,则它隐藏在它的后面,因此您看不到它的作用。
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