如何在ios中获得旋转UIView的完美X,Y位置

Question

我正在使用CABasicanimation来旋转UIView.我正在使用此代码,

    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"];

在这里我想要完美的X,Y位置,而"UIView"正在旋转.如果有人知道请帮助我.

先感谢您.

Answer 1

那么，如果我理解正确的话，您只想在旋转过程中获取视图的 X 和 Y 坐标？

您可以通过记录presentationLayer的框架来做到这一点，如下所示：

- (IBAction)buttonAction:(UIButton *)sender {

    CGRect position = [[CircleView.layer presentationLayer] frame];
    NSLog(@"%@", NSStringFromCGRect(position));
}