CABasicAnimation不会为我的不透明度设置动画

Question

我正在使用CABasicAnimation尝试为我的根级视图层设置动画，而不会设置动画。 动画发生在大约0.2，而不是下面的77.0。

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"opacity"];
animation.beginTime = 1.0;
animation.duration = 77.0;
animation.fromValue = [NSNumber numberWithFloat:0.0f];
animation.toValue = [NSNumber numberWithFloat:1.0f];
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeBoth;
animation.additive = NO;

[self.layer addAnimation:animation forKey:@"show-anim" ];

Answer 1

您需要相对于当前媒体时间设置开始时间：

    animation.beginTime = CACurrentMediaTime() + 1;