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我想恢复路径图的方向。所以我改变了 fromValue 和 toValue 属性，但现在完整路径在动画开始时可见并且它开始消失。我有路径：

UIBezierPath* bezierPath = [UIBezierPath bezierPath];


    [bezierPath moveToPoint: CGPointMake(213.79, 170.83)];
    [bezierPath addCurveToPoint: CGPointMake(131.93, 95) controlPoint1: CGPointMake(212.14, 128.68) controlPoint2: CGPointMake(176.13, 95)];
    [bezierPath addCurveToPoint: CGPointMake(50, 173.85) controlPoint1: CGPointMake(86.68, 95) controlPoint2: CGPointMake(50, 130.3)];
    [bezierPath addCurveToPoint: CGPointMake(131.93, 252.7) controlPoint1: CGPointMake(50, 217.4) controlPoint2: CGPointMake(86.68, 252.7)];
    [bezierPath addCurveToPoint: CGPointMake(157.55, 248.76) controlPoint1: CGPointMake(140.88, 252.7) controlPoint2: CGPointMake(149.49, 251.32)];
    [bezierPath addCurveToPoint: CGPointMake(209.69, 281) controlPoint1: CGPointMake(166.59, 267.78) controlPoint2: CGPointMake(186.54, 281)];
    [bezierPath addCurveToPoint: CGPointMake(267, 225.85) controlPoint1: CGPointMake(241.34, 281) controlPoint2: CGPointMake(267, 256.31)];
    [bezierPath addCurveToPoint: CGPointMake(213.79, 170.83) controlPoint1: CGPointMake(267, 196.71) controlPoint2: CGPointMake(243.53, 172.86)];
    [bezierPath closePath];


    [color0 setStroke];
    bezierPath.lineWidth = 11;
    [bezierPath stroke];

和动画：

UIColor* color = [UIColor colorWithRed: 0.369 green: 0.42 blue: 0.475 alpha: 1];

    UIBezierPath *bezierPath = [self bezierPath];


    CAShapeLayer *bezier = [[CAShapeLayer alloc] init];

    bezier.path          = bezierPath.CGPath;
    bezier.lineCap       = kCALineCapRound;
    bezier.strokeColor   = color.CGColor;
    bezier.fillColor     = [UIColor clearColor].CGColor;
    bezier.strokeStart   = 1.0;
    bezier.strokeEnd     = 0.0;
    bezier.lineWidth     = 8.0;
    bezier.strokeStart   = 0.0;
    bezier.strokeEnd     = 1.0;
    [self.view.layer addSublayer:bezier];

    if (animate)
    {
        CABasicAnimation *animateStrokeEnd = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
        animateStrokeEnd.duration  = appDelegate.myPlayer.audioPlayer.duration;
        animateStrokeEnd.fromValue = [NSNumber numberWithFloat:1.0f];
        animateStrokeEnd.toValue   = [NSNumber numberWithFloat:0.0f];
        [bezier addAnimation:animateStrokeEnd forKey:@"strokeEndAnimation"];
    }
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1 回答 1

9

您在正确的轨道上，但您应该为strokeStart属性设置动画。

从同时拥有strokeStart和strokeEnd作为 1.0 开始。

strokeStart 然后从1.0动画到0.0。这将为您提供从末端到起点的路径效果。

例如，当 25% 的路径被激发时，您的 strokeStart 为 0.75，strokeEnd 为 1.0。

于 2013-05-10T17:34:48.727 回答