Iphone CALayer在尝试设置动画时会立即移动？

下面的代码处理一堆

calayer

。每次将新层推到堆栈上时，函数都会被锁定，所有现有层都会在屏幕上向下移动，以便为新层腾出空间。一旦最后一层完成动画制作，该功能将再次解锁，以便推送新层

我的问题是每次代码在

newLayer

上运行初始动画时。换句话说，与其将新层定位在

CGPointMake（0，0-offset）

上，然后将其动画化为

CGPointMake（0，currentLayer.position.y+offset）

，它会立即显示在其最终位置。我错过什么了吗？谢谢

-(void)addNewLayerWithHeight:(float)layerHeight {
    if(!animationLocked) {
        animationLocked = YES;
        //Offset is the ammount that each existing layer will need to be moved down by
        int offset = layerHeight;

        //Create the new layer
        CALayer *newLayer = [CALayer layer];
        [newLayer setBounds:CGRectMake(0, 0, self.view.layer.bounds.size.width, layerHeight)];
        [newLayer setAnchorPoint:CGPointMake(0, 0)];
        [newLayer setPosition:CGPointMake(0, 0-offset)];
        [newLayer setBackgroundColor:[[UIColor redColor] CGColor]];

        //Add the new layer to the view's layer and to layerArray
        [self.view.layer addSublayer:newLayer];
        [layerArray insertObject:newLayer atIndex:0];

        //loop through all layers and move them to their new position...
        for(int i=0;i<[layerArray count]; i++) {
            CALayer *currentLayer = [layerArray objectAtIndex:i];

            CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"position"];
            [anim setValue:@"stackLayer" forKey:@"kind"];
            [anim setValue:[NSNumber numberWithInt:i] forKey:@"index"];
            [anim setDelegate:self];
            [anim setDuration:1.0];

            currentLayer.actions = [NSDictionary dictionaryWithObject:anim forKey:@"position"];
            currentLayer.position = CGPointMake(0, currentLayer.position.y + offset);
        }
    }
}

-(void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
    //Make sure the last layer finished animating...
    if([[anim valueForKey:@"kind"] isEqual:@"stackLayer"] && [[anim valueForKey:@"index"] isEqual:[NSNumber numberWithInt:[layerArray count]-1]]) {
        animationLocked = NO;
    }
}

-（void）addNewLayerWithHeight:（float）layerHeight{
如果（！animationLocked）{
animationLocked=是；
//偏移量是每个现有层需要向下移动的数量
int offset=图层亮度；
//创建新图层
CALayer*newLayer=[CALayer layer]；
[newLayer-setBounds:CGRectMake（0,0，self.view.layer.bounds.size.width，layerHeight）]；
[newLayer setancorpoint:CGPointMake（0,0）]；
[新图层设置位置：CGPointMake（0，0-偏移）]；
[newLayer setBackgroundColor:[[UIColor redColor]CGColor]]；
//将新图层添加到视图的图层和LayerRay
[self.view.layer addSublayer:newLayer]；
[layerArray插入对象：新层索引：0]；
//循环遍历所有层并将它们移动到新位置。。。
对于（int i=0；i，您必须在动画中设置新的层位置，而不是直接在层上设置

CAlayer *layer = ...

CABasicAnimation *positionAnimation = [CABasicAnimation animationWithKeyPath:@"transform.translation"];]
positionAnimation.fromValue = oldPOsition
positionAnimation.toValue = newPosition
positionAnimation.duration = n;
positionAnimation.delegate = self;          

[layerToAnimate addAnimation:layerAnimation forKey:@"transform.translation"]

你已经很接近了。我会把你循环中的代码改成：

for(int i=0;i<[layerArray count]; i++)
{
  CALayer *currentLayer = [layerArray objectAtIndex:i];

  CGPoint endPoint = CGPointMake(0, currentLayer.position.y + offset);
  CGPoint currentPoint = [currentLayer position];

  CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"position"];
  [anim setFromValue:[NSValue valueWithCGPoint:currentPoint]];
  [anim setToValue:[NSValue valueWithCGPoint:endPoint]];
  [anim setDelegate:self];
  [anim setDuration:1.0];

  [anim setValue:@"stackLayer" forKey:@"kind"];
  [anim setValue:[NSNumber numberWithInt:i] forKey:@"index"];

  [currentLayer setPosition:endPoint];
  [currentLayer addAnimation:anim forKey:@"position"];
}

for（int i=0；问题是，您正在绘制的是一个显式动画，动画完成后，层会恢复回其原始位置。