CAAnimation - 更改动画最后一帧的属性?
Posted
技术标签:
【中文标题】CAAnimation - 更改动画最后一帧的属性?【英文标题】:CAAnimation - change properties in the last frame of the animation? 【发布时间】:2011-06-01 10:19:11 【问题描述】:我正在为 UIView(或者更确切地说是它的 CALayer)制作动画,并且在动画结束时它不再可见(我进行了 3D 变换,使其围绕 y 旋转 90°,想象一扇门朝你打开) ,尽管它在技术上是“可见的”,因为它的框架仍在屏幕上。
在此动画结束时,我在 animationDidStop:finished: 方法中从其父视图中删除了该视图。
问题是,有一个短暂的闪烁,您可以在此视图中看到它在被移除之前的原始未转换状态。
我想知道如何解决这个问题。我不知道。我尝试为图层的不透明度设置动画,但这也不起作用。闪烁仍然发生。
有什么想法吗?我可以提供任何东西吗?或者这里有人可能以前遇到过这个问题?
编辑:这是一些代码(向下滚动并查找 if(isHalfDone) where [subview removeFromSuperview]; 内的行);
- (void) pageOpenView:(UIView *)viewToOpen duration:(NSTimeInterval)duration pageTurnDirection:(PageTurnDirection) p
// Remove existing animations before stating new animation
[viewToOpen.layer removeAllAnimations];
// Make sure view is visible
viewToOpen.hidden = NO;
// disable the view so it’s not doing anythign while animating
viewToOpen.userInteractionEnabled = NO;
float dir = p == 0 ? -1.0f : 1.0f; // for direction calculations
// create an animation to hold the page turning
CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
transformAnimation.removedOnCompletion = NO;
transformAnimation.duration = duration;
transformAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
CATransform3D startTransform = CATransform3DIdentity;
if (p == NEXT_PAGE)
startTransform.m34 = 0.001f;
else
startTransform.m34 = -0.001f;
// start the animation from the current state
transformAnimation.fromValue = [NSValue valueWithCATransform3D:startTransform];
// this is the basic rotation by 90 degree along the y-axis
CATransform3D endTransform = CATransform3DMakeRotation(3.141f/2.0f,
0.0f,
dir,
0.0f);
// these values control the 3D projection outlook
if (p == NEXT_PAGE)
endTransform.m34 = 0.001f;
endTransform.m14 = -0.0015f;
else
endTransform.m34 = -0.001f;
endTransform.m14 = 0.0015f;
transformAnimation.toValue = [NSValue valueWithCATransform3D:endTransform];
// Create an animation group to hold the rotation
CAAnimationGroup *theGroup = [CAAnimationGroup animation];
// Set self as the delegate to receive notification when the animation finishes
theGroup.delegate = self;
theGroup.duration = duration;
// CAAnimation-objects support arbitrary Key-Value pairs, we add the UIView tag
// to identify the animation later when it finishes
[theGroup setValue:[NSNumber numberWithInt:viewToOpen.tag] forKey:@"viewToOpenTag"]; // We set the tag to the page number
[theGroup setValue:[NSNumber numberWithInt: p] forKey:@"PageTurnDirection"];
[theGroup setValue:[NSNumber numberWithBool:YES] forKey:@"isAnimationMidpoint"]; // i.e. is this the first half of page-turning or not?
// Here you could add other animations to the array
theGroup.animations = [NSArray arrayWithObjects:transformAnimation, nil];
theGroup.removedOnCompletion = NO;
// Add the animation group to the layer
[viewToOpen.layer addAnimation:theGroup forKey:@"flipViewOpen"];
- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
// Get the tag from the animation, we use it to find the animated UIView
NSNumber *tag = [theAnimation valueForKey:@"viewToOpenTag"];
PageTurnDirection dir = [[theAnimation valueForKey:@"PageTurnDirection"] intValue];
BOOL isHalfDone = [[theAnimation valueForKey:@"isAnimationMidpoint"] boolValue];
UIView *toStack; // the stack the page has moved from
UIView *fromStack; // the stack the new page will go to.
int indexDirection; // will be either 1 or -1
int targetLastPageInStack; // the page number that wants to get added to its stack (i.e. either high or low)
// depending on which direction we are turning, we search a different stack
if (dir == NEXT_PAGE)
fromStack = rightStack;
toStack = leftStack;
indexDirection = 1;
int lastPg;
UIView *lastPgInStack;
if ([fromStack.subviews count] > 0)
lastPgInStack = [fromStack.subviews objectAtIndex:0];
if ([lastPgInStack tag] == pageIndex)
lastPg = pageIndex; // pagenr of currently last page in stack.
else
// there was no last page, so the current page is the last page
lastPg = [lastPgInStack tag];
else
lastPg = pageIndex;
targetLastPageInStack = lastPg + 2;
else
fromStack = leftStack;
toStack = rightStack;
indexDirection = -1;
int lastPg;
UIView *lastPgInStack = [fromStack.subviews objectAtIndex:0];
if ([lastPgInStack tag] == pageIndex-1)
lastPg = pageIndex-1; // pagenr of currently last page in stack.
else
// there was no last page, so the current page is the last page
lastPg = [lastPgInStack tag];
targetLastPageInStack = lastPg - 2;
// different handling if the page turning is half done, or fully done.
if (isHalfDone)
UIView *subview = [fromStack viewWithTag:[tag intValue]];
if (flag)
// Now we just hide the animated view since
// animation.removedOnCompletion is not working
// in animation groups. Hiding the view prevents it
// from returning to the original state and showing.
subview.hidden = YES;
[subview removeFromSuperview]; // REMOVE THE ANIMATED PAGE FROM THE STACK
// now create one on that stack
if ((dir == NEXT_PAGE && targetLastPageInStack <= self.endPageIndex) || (dir == PREV_PAGE && targetLastPageInStack >= self.startPageIndex))
BODBookPage *newPage = [BODBookPage pageInBook:&myDocumentRef pageNum:targetLastPageInStack frame:fromStack.bounds] ;
newPage.hidden = NO;
[fromStack insertSubview:newPage atIndex:0];
// now create the view for the page that'll be turned over and add it to the right stack. Probably set it to hidden as well.
BODBookPage *newPage = [BODBookPage pageInBook:&myDocumentRef pageNum:[tag intValue] + 1*indexDirection frame:toStack.bounds] ;
newPage.hidden = YES;
[toStack addSubview:newPage];
[self pageCloseView:newPage duration:turningTime/2.0f pageTurnDirection:dir];
else
// we just animated the page turning from up to over
// now have to remove the most distant view, so the view at subview index 0. We do this to keep memory usage low.
if ([toStack.subviews count] > 1)
[(UIView*)[toStack.subviews objectAtIndex:0] removeFromSuperview];
pageIndex = pageIndex + 2*indexDirection;
【问题讨论】:
这个问题好像和this one as well一样 【参考方案1】:这就是问题的答案:关于animation fillMode property。
【讨论】:
必须的!没有什么比一个人写下“帮帮我,帮帮我,帮帮我!请为我写代码……”然后是“我修好了”的人更烦人了。没有解释为什么...... 您也可以接受它作为答案。这将增加答案的可信度以上是关于CAAnimation - 更改动画最后一帧的属性?的主要内容,如果未能解决你的问题,请参考以下文章