感谢在StackOverflow上的一些帮助,我目前正在动画CAShapeLayer中的一个路径,以创建一个从移动的精灵指向屏幕上另一个移动点的三角形。CAShapeLayer路径在动画后消失 - 需要它留在同一个地方
动画完成后,三角形从屏幕上消失。我使用的持续时间很短,因为这些代码每次都会以每秒0.1秒的速度触发。结果是正确的红色三角形轨道,但它快速闪烁或不完全。当我调整持续时间时,我可以看到三角形停留的时间更长。
我能做些什么来让三角形留在屏幕上,它的当前路径(tovalue
)直到再次调用该方法以从现场动画到下一个点?我尝试设置removedOnCompletion和removeAllAnimations,但无济于事。下面
代码:
-(void)animateConnector{
//this is the code that moves the connector from it's current point to the next point
//using animation vs. position or redrawing it
//set the newTrianglePath
newTrianglePath = CGPathCreateMutable();
CGPathMoveToPoint(newTrianglePath, nil, pointGrid.x, pointGrid.y);//start at bottom point on grid
CGPathAddLineToPoint(newTrianglePath, nil, pointBlob.x, (pointBlob.y - 10.0));//define left vertice
CGPathAddLineToPoint(newTrianglePath, nil, pointBlob.x, (pointBlob.y + 10.0));//define the right vertice
CGPathAddLineToPoint(newTrianglePath, nil, pointGrid.x, pointGrid.y);//close the path
CGPathCloseSubpath(newTrianglePath);
//NSLog(@"PointBlob.y = %f", pointBlob.y);
CABasicAnimation *connectorAnimation = [CABasicAnimation animationWithKeyPath:@"path"];`enter code here`
connectorAnimation.duration = .007; //duration need to be less than the time it takes to fire handle timer again
connectorAnimation.removedOnCompletion = NO; //trying to keep the the triangle from disappearing after the animation
connectorAnimation.fromValue = (id)trianglePath;
connectorAnimation.toValue = (id)newTrianglePath;
[shapeLayer addAnimation:connectorAnimation forKey:@"animatePath"];
//now make the newTrianglePath the old one, so the next animation starts with the new position 2.9-KC
self.trianglePath = self.newTrianglePath;
}
我的回答对你有帮助吗?如果是这样,你能标记它吗? – bstahlhood 2010-08-30 18:15:24