CABasicAnimation不會為我的不透明度設置動畫

Question

我正在使用CABasicAnimation嘗試為我的根級視圖層設置動畫，而不會設置動畫。 動畫發生在大約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

您需要相對於當前媒體時間設置開始時間：

    animation.beginTime = CACurrentMediaTime() + 1;