相关疑难解决方法(0)

我正在旋转CALayer,并在动画完成后尝试将其停在最终位置.

但是在动画完成后,它会重置到其初始位置.

(xcode docs明确表示动画不会更新属性的值.)

任何建议如何实现这一目标.

我试图动画一段圆的外观.为了存档这个我使用CABasicAnimations工作安静.

动画从顶部开始,很好地移动到整个圆圈的三分之一.但是当动画结束时,圆圈会立即被完全绘制.

我怎么能防止这种情况？

这是我的自定义UIView的源代码:

- (void)drawRect:(CGRect)rect
{
    int radius = 100;
    int strokeWidth = 10;
    CGColorRef color = [UIColor redColor].CGColor;
    int timeInSeconds = 5;

    CGFloat startAngle = 0;
    CGFloat endAngle = 0.33;

    CAShapeLayer *circle = [CAShapeLayer layer];

    circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 2.0*radius, 2.0*radius) cornerRadius:radius].CGPath;

    circle.position = CGPointMake(CGRectGetMidX(self.frame)-radius, CGRectGetMidY(self.frame)-radius);

    circle.fillColor = [UIColor clearColor].CGColor;
    circle.strokeColor = color;
    circle.lineWidth = strokeWidth;

    [self.layer addSublayer:circle];

    CABasicAnimation *drawAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    drawAnimation.duration            = timeInSeconds;
    drawAnimation.repeatCount         = 1.0;
    drawAnimation.removedOnCompletion = NO;

    drawAnimation.fromValue = [NSNumber numberWithFloat:startAngle];
    drawAnimation.toValue …