我正在使用此代码创建幻灯片以解锁动画,但我无法通过right to left
制作动画。
如何从右侧开始,从左侧开始动画?
-(void)slideToCancel {
CALayer *maskLayer = [CALayer layer];
// Mask image ends with 0.15 opacity on both sides. Set the background color of the layer
// to the same value so the layer can extend the mask image.
maskLayer.backgroundColor = [[UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.50f] CGColor];
maskLayer.contents = (id)[[UIImage imageNamed:@"slidetocancel.png"] CGImage];
// Center the mask image on twice the width of the text layer, so it starts to the left
// of the text layer and moves to its right when we translate it by width.
maskLayer.contentsGravity = kCAGravityCenter;
maskLayer.frame = CGRectMake(_slideToCancelLbl.frame.size.width * -1, 0.0f, _slideToCancelLbl.frame.size.width * 2, _slideToCancelLbl.frame.size.height);
// Animate the mask layer's horizontal position
CABasicAnimation *maskAnim = [CABasicAnimation animationWithKeyPath:@"position.x"];
maskAnim.byValue = [NSNumber numberWithFloat:_slideToCancelLbl.frame.size.width];
maskAnim.repeatCount = 1e100f;
maskAnim.duration = 1.5f;
[maskLayer addAnimation:maskAnim forKey:@"slideAnim"];
_slideToCancelLbl.layer.mask = maskLayer;
}
答案 0 :(得分:0)
您应该能够简单地使用负值byValue。但是,您发布的代码是一个预制动画,而不是一个响应幻灯片动画的动画。