xcode - 如何让物体无限旋转

Question

我正在想办法如何让这一切永远持续下去。现在持续 1 秒。

extension UIView {
func rotate360Degrees(duration: CFTimeInterval = 20, completionDelegate: AnyObject? = nil) {
    let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
    rotateAnimation.fromValue = 0.0
    rotateAnimation.toValue = CGFloat(M_PI * 2.0)
    rotateAnimation.duration = duration

    if let delegate: AnyObject = completionDelegate {
        rotateAnimation.delegate = delegate
    }
    self.layer.addAnimation(rotateAnimation, forKey: nil)
}

}

Answer 1

您可以添加:

rotateAnimation.repeatCount = Float(CGFloat.max)

或者反转并重复:

rotateAnimation.autoreverse = true//虽然这可能不是您所需要的。

这给了我一个永远旋转的盒子。

    let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
    rotateAnimation.fromValue = 0.0
    rotateAnimation.toValue = CGFloat(M_PI * 2.0)
    rotateAnimation.duration = duration
    rotateAnimation.autoreverses = true
    rotateAnimation.repeatCount = Float(CGFloat.max)