无限旋转视图 360 度

Question

我正在使用此代码将视图无限旋转 360 度。 但我的观点并没有旋转：

func rotateImageView() {

        UIView.animate(withDuration: 3.0, delay: 0, options: [.repeat, .curveLinear], animations: {
            self.vinylView.transform = CGAffineTransform(rotationAngle: .pi * 2)
        })
        
    }

如何解决？

Answer 1

用 / 替换 pi *，删除重复，添加完成并调用函数，如下所示：

private func rotateImageView() {
    UIView.animate(withDuration: 3, delay: 0, options: .curveLinear, animations: {
        self.vinylView.transform = self.vinylView.transform.rotated(by: .pi / 2)
    }) { (finished) in
        if finished {
            self.rotateImageView()
        }
    }
}

Answer 2

使用 CABasicAnimation 的解决方案

// Rotate vinvlView
vinylView.layer.add(CABasicAnimation.rotation, forKey: nil)

extension CABasicAnimation {
    static let rotation : CABasicAnimation = {
        let animation = CABasicAnimation(keyPath: "transform.rotation.z")
        animation.repeatCount = .infinity // Rotate a view 360 degrees infinitely
        animation.fromValue = 0
        animation.toValue = CGFloat.pi * 2
        animation.duration = 3.0
        return animation
    }()
}