尝试放大和缩小时出现问题从 UIButton 到 CAAnimationGroup

Question

没有动画，因为我做错了？

-(void)swipeanimateDidStop {

    for (UIView *subview in self.swipingCell.backView.subviews){
        NSLog(@"%@",subview);
        // subview is UIButton
        [subview.layer addAnimation:[self ZoomAnimation] forKey:@"Zoom"];

    }
}

-(CAAnimationGroup *)ZoomAnimation {
    CAAnimationGroup *ZoomAnimation = [CAAnimationGroup animation];
    CABasicAnimation *In = [self zoomIn];

    ZoomAnimation.animations = [NSArray arrayWithObjects: In, nil];
    ZoomAnimation.duration = 2.0f;
    return ZoomAnimation;
}

-(CABasicAnimation *)zoomIn {
    CABasicAnimation *ZoomInAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
    ZoomInAnimation.beginTime = 0.0f;
    ZoomInAnimation.fromValue = [NSNumber numberWithFloat:20.0];
    ZoomInAnimation.toValue = [NSNumber numberWithFloat:1.0];
    ZoomInAnimation.duration = 2.0f;
    return ZoomInAnimation;
}

Answer 1

错误出现在 zoomIn 方法中。关键路径应该是 transform.scale （因为它是缩放）。

CABasicAnimation *ZoomInAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];