ios - 如何在 iOS 中获得完美的旋转 UIView 的 X，Y 位置

Question

我正在使用 CABasicanimation 来旋转 UIView。我正在使用这段代码:

    CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    NSNumber *currentAngle = [CircleView.layer.presentationLayer valueForKeyPath:@"transform.rotation"];
    rotationAnimation.fromValue = currentAngle;
    rotationAnimation.toValue = @(50*M_PI);
    rotationAnimation.duration = 50.0f;             // this might be too fast
    rotationAnimation.repeatCount = HUGE_VALF;     // HUGE_VALF is defined in math.h so import it
    [CircleView.layer addAnimation:rotationAnimation forKey:@"rotationAnimationleft"];

在此，我想要在“UIView”旋转时完美的 X、Y 位置。我怎样才能做到这一点？

Answer 1

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