Question

示例代码为here。

用隐式属性动画替换显式属性动画后，动画就会中断。

显式动画：

-(void)animate:(id)sender {
    ...
    //Transform Animation
    animation = [CABasicAnimation animationWithKeyPath:@"transform"];
    animation.fromValue = [NSValue valueWithCATransform3D: CATransform3DIdentity];
    animation.toValue = [NSValue valueWithCATransform3D: t];
    animation.duration = 1.0;
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeBoth;
    [subLayer addAnimation:animation forKey:@"transform"];

    //Opacity Animation
    animation = [CABasicAnimation animationWithKeyPath:@"opacity"];
    animation.fromValue = [NSNumber numberWithFloat:1.0];
    animation.toValue = [NSNumber numberWithFloat:0.0];
    animation.duration = 1.0;
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeBoth;
    [subLayer addAnimation:animation forKey:@"opacity"];
    ...
}

-(void)reset:(id)sender {       
    ...
    //Transform Animation
    animation = [CABasicAnimation animationWithKeyPath:@"transform"];
    animation.fromValue = [NSValue valueWithCATransform3D: t];
    animation.toValue = [NSValue valueWithCATransform3D: CATransform3DIdentity];
    animation.duration = 1.0;
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeBoth;
    [subLayer addAnimation:animation forKey:@"transform"];

    //Opacity Animation
    animation = [CABasicAnimation animationWithKeyPath:@"opacity"];
    animation.fromValue = [NSNumber numberWithFloat:0.0];
    animation.toValue = [NSNumber numberWithFloat:1.0];
    animation.duration = 1.0;
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeBoth;
    [subLayer addAnimation:animation forKey:@"opacity"];

    ...
}

隐式动画：

-(void)animate:(id)sender {
    ...
    //Transform Animation
    [CATransaction setAnimationDuration:1];
    subLayer.transform = t;

    //Opacity Animation
    [CATransaction setAnimationDuration:1];
    subLayer.opacity = 0;
    ...
}

-(void)reset:(id)sender {       
    ...
    //Transform Animation
    [CATransaction setAnimationDuration:1];
    subLayer.transform = CATransform3DIdentity;

    //Opacity Animation
    [CATransaction setAnimationDuration:1];
    subLayer.opacity = 1;       
    ...
}

为什么？

Answer 1

使用隐式动画时，不需要使用CATransaction。请注意，uikit会禁用作为UIView

根层的图层的隐式动画

Answer 2

您应该将CALayer的委托设置为视图控制器在适当时间查看的不同内容（不包括nitWithNibName：bundle：，awakeFromNib，viewDidLoad和viewWillAppear：animated），请查看此处：Does iPhone OS support implicit animation? 。

在我的机器上，通过触摸调用动画效果非常好。

隐式属性动画不适用于CAReplicatorLayer？

2 个答案: