0

我有许多 CAShapeLayers 已经是视图层 (UIView) 的子层。我可以毫无困难地为他们的路径设置动画。但是，我需要稍后添加一些额外的形状图层，然后为所有形状图层的所有路径设置动画。当我尝试插入新的子层时，动画不再出现。视图以最终状态的所有形状图层进行渲染。

这是我正在处理的代码块。当我将其注释掉时，现有图层的路径动画效果很好。有人可以告诉我发生了什么事吗？

for (int i = oldPoints.count; i < newPoints.count; i++)
    [self.layer insertSublayer: [CAShapeLayer layer] atIndex: ++layerIndex];

另外，我尝试调用 -addSublayer: 并且得到相同的结果。

我的超级视图中的动画代码如下所示：

[UIView animationWithDuration: 0.2
                   animations: ^{

                       for (ComponentView *view in _componentViews)
                           [view reloadDataWithAnimation: YES];

                       [self layoutComponentViews];
                   }
                   completion: ^(BOOL finished) {

                   }];

在 -reloadDataWithAnimation: 在我的 ComponentView 中，我有以下代码：

- (void) reloadDataWithAnimation: (BOOL) animate {

    for (int rowIndex = 0; rowIndex < oldData.count; rowIndex++) {

        NSArray     *oldPoints  = [oldData objectAtIndex: rowIndex];
        NSArray     *newPoints  = nil;

        if (rowIndex < newData.count)
            newPoints = [newData objectAtIndex: rowIndex];


        if (newPoints.count > oldPoints.count) {

            layerIndex += oldPoints.count;

            for (int i = oldPoints.count; i < newPoints.count; i++)
                [self.layer insertSublayer: [CAShapeLayer layer] atIndex: ++layerIndex];

        }
        else if (newPoints.count < oldPoints.count) {

            layerIndex += newPoints.count;

            for (int i = newPoints.count; i < oldPoints.count; i++)
                [disposableLayers addObject: [self.layer.sublayers objectAtIndex: ++layerIndex]];

        }
        else {

            if (newPoints.count > 0)
                layerIndex += newPoints.count;

        }
    }

    if (newData.count > oldData.count) {

        for (int rowIndex = oldData.count; rowIndex < newData.count; rowIndex++) {

            NSArray *newPoints = [newData objectAtIndex: rowIndex];

            for (int i = 1; i < newPoints.count; i++)
                [self.layer insertSublayer: [CAShapeLayer layer] atIndex: ++layerIndex];

        }
    }

    /*  code that iterates through old and new data structures  */

        CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath: @"path"];
        [animation setFromValue: (__bridge id) oldPath];
        [animation setToValue: (__bridge id) newPath];
        [animation setFillMode: kCAFillModeForwards];
        [animation setDuration: _defaultAnimationDuration];

        CAShapeLayer *shapeLayer = (CAShapeLayer *) [self.layer.sublayers objectAtIndex: layerIndex];
        [shapeLayer setPath: newPath];
        [shapeLayer setStrokeColor: [self strokeColorForItemAtIndexPath: indexPath].CGColor];
        [shapeLayer setLineWidth: self.lineWidth];
        [shapeLayer addAnimation: animation forKey: @"path"];

}

谢谢！

4

0 回答 0