Question

我正在尝试添加到CATextlayer中的一组动画;一个不透明度的动画，它使图层在几秒后消失，并且是一个“摇动”的动画，在这个动画中，我希望图层在它访问时稍微摇动一下。不透明度动画效果很好;摇晃没有做任何事情 - 我希望我能解释一下原因。

这是我的图层和不透明度动画的代码，它可以正常工作：

    CATextLayer *subtitle1Text = [[CATextLayer alloc] init];
    [subtitle1Text setFont:@"Helvetica-Bold"];
    [subtitle1Text setFontSize:25];
    [subtitle1Text setFrame:CGRectMake(0, 0, self.screenSize.width, 100)];
    [subtitle1Text setString: self.videoDescription1.text ];
    [subtitle1Text setAlignmentMode:kCAAlignmentCenter];
    [subtitle1Text setForegroundColor:[[UIColor whiteColor] CGColor]];

    CABasicAnimation *animation1 =[CABasicAnimation animationWithKeyPath:@"opacity"];
    animation1.duration= 0 ;
    animation1.fromValue=[NSNumber numberWithFloat:1.0];
    animation1.toValue=[NSNumber numberWithFloat:0.0];
    animation1.beginTime = 3;
    animation1.removedOnCompletion = NO;
    animation1.fillMode = kCAFillModeBoth;
    animation1.additive = NO;
    animation1.autoreverses = NO;

这是我动摇的动画，它没有做任何事情：

    CAKeyframeAnimation * shakeAnim = [ CAKeyframeAnimation animationWithKeyPath:@"transform" ] ;
    shakeAnim.values = @[ [ NSValue valueWithCATransform3D:CATransform3DMakeTranslation(-10.0f, 0.0f, 0.0f) ], [ NSValue valueWithCATransform3D:CATransform3DMakeTranslation(10.0f, 0.0f, 0.0f) ] ] ;
    shakeAnim.autoreverses = YES ;
    shakeAnim.repeatCount = 2.0f ;
    shakeAnim.duration = 0.07f ;
    shakeAnim.beginTime = 0;
    shakeAnim.fillMode = kCAFillModeBoth;

这里我添加了动画：

    CALayer *overlayLayer1 = [CALayer layer];
    [overlayLayer1 addSublayer:subtitle1Text];
    overlayLayer1.frame = CGRectMake(0, 0,
                                    self.screenSize.width, self.screenSize.height);
    [overlayLayer1 setMasksToBounds:YES];
    [overlayLayer1 addAnimation:shakeAnim forKey:@"transform" ] ;
    [overlayLayer1 addAnimation:animation1 forKey:@"opacityOUT"];

    CALayer *parentLayer = [CALayer layer];
    CALayer *videoLayer = [CALayer layer];
    parentLayer.frame = CGRectMake(0, 0, self.screenSize.width, self.screenSize.height);
    videoLayer.frame = CGRectMake(0, 0, self.screenSize.width, self.screenSize.height);
    [parentLayer addSublayer:videoLayer];
    [parentLayer addSublayer:overlayLayer1];

对于摇晃不起作用的任何想法都会喜欢。

为什么摇动CALayer动画不起作用？

0 个答案: