感謝在StackOverflow上的一些幫助,我目前正在動畫CAShapeLayer中的一個路徑,以創建一個從移動的精靈指向屏幕上另一個移動點的三角形。CAShapeLayer路徑在動畫後消失 - 需要它留在同一個地方
動畫完成後,三角形從屏幕上消失。我使用的持續時間很短,因爲這些代碼每次都會以每秒0.1秒的速度觸發。結果是正確的紅色三角形軌道,但它快速閃爍或不完全。當我調整持續時間時,我可以看到三角形停留的時間更長。
我能做些什麼來讓三角形留在屏幕上,它的當前路徑(tovalue
)直到再次調用該方法以從現場動畫到下一個點?我嘗試設置removedOnCompletion和removeAllAnimations,但無濟於事。下面
代碼:
-(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;
}
我的回答對你有幫助嗎?如果是這樣,你能標記它嗎? – bstahlhood 2010-08-30 18:15:24