ios - 在 Swift 中无限期地旋转 View 360 度？

Question

我想无限期地旋转 ImageView 360 度。

UIView.animate(withDuration: 2, delay: 0, options: [.repeat], animations: {
    self.view.transform = CGAffineTransform(rotationAngle: 6.28318530717959)
}, completion: nil)

我该怎么做？

Answer 1

更新 Swift 5.x

// duration will helps to control rotation speed
 private func rotateView(targetView: UIView, duration: Double = 5) {
    UIView.animate(withDuration: duration, delay: 0.0, options: .curveLinear, animations: {
        targetView.transform = targetView.transform.rotated(by: .pi)
    }) { finished in
        self.rotateView(targetView: targetView, duration: duration)
    }
}

无限旋转 UIView 的 Swift 2.x 方法，根据早期答案编译:

// Rotate <targetView> indefinitely
private func rotateView(targetView: UIView, duration: Double = 1.0) {
    UIView.animateWithDuration(duration, delay: 0.0, options: .CurveLinear, animations: {
        targetView.transform = CGAffineTransformRotate(targetView.transform, CGFloat(M_PI))
    }) { finished in
        self.rotateView(targetView, duration: duration)
    }
}

更新 Swift 3.x

// Rotate <targetView> indefinitely
private func rotateView(targetView: UIView, duration: Double = 1.0) {
    UIView.animate(withDuration: duration, delay: 0.0, options: .curveLinear, animations: {
        targetView.transform = targetView.transform.rotated(by: CGFloat(M_PI))
    }) { finished in
        self.rotateView(targetView: targetView, duration: duration)
    }
}