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3D变换，使其在y方向旋转90°，想象一扇门向你敞开）虽然它在技术上“可见”，因为它的画面仍在屏幕上。
在这个动画结束时，我从animationDidStop：finished：方法中的superview中删除了该视图。
问题是，有一个短暂的闪烁，你可以在它被删除之前看到它的原始未转换状态。
我想知道如何解决这个问题。我不知道。我尝试动画图层的不透明度，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，或者之前有人有过这个问题吗？
编辑：这是一些代码（向下滚动并查找if（isHalfDone）里面的行，其中[subview removeFromSuperview];
- (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;
}
}