UIRotationGestureRecognizer

用 UIRotationGestureRecognizer 可以听到围绕中心旋转的两个手指。这通常用于旋转视图。

迅速

override func viewDidLoad() {
    super.viewDidLoad()

    // Rotate
    let rotateGesture = UIRotationGestureRecognizer(target: self, action: #selector(handleRotate(_:)))
    rotateView.addGestureRecognizer(rotateGesture)
}

// Rotate action
func handleRotate(gesture: UIRotationGestureRecognizer) {
    label.text = "Rotate recognized"

    if gesture.state == UIGestureRecognizerState.Changed {
        let transform = CGAffineTransformMakeRotation(gesture.rotation)
        rotateView.transform = transform
    }
}

笔记

• 可在此处找到示例项目。