Swift-旋转手势，旋转增量为90度 [英] Swift - Rotate gesture and rotation increments of 90 degrees

问题描述

我有一个UIRotationGestureRecognizer的rotateView设置.可以按预期工作，但是我只想以90度的凹口/增量旋转.默认行为使您可以非常精确地进行旋转.我希望相反，只有4个可能的职位.

I have a rotateView setup with a UIRotationGestureRecognizer. Works as intended, however I would like to only rotate in notches/increments of 90 degrees. The default behavior allows you to be very granular and precise with the rotation. I want it to be the opposite, of only 4 possible positions.

我下面的代码尽可能地接近我，但是我面临的问题是旋转只发生一次，并且只向一个方向旋转(即使我的两根手指向左旋转，也向右旋转)

The code I have below is as close I could get, however the problem I am facing is the rotation only happens once, and only to one direction (rotates to the right, even if I 2-fingers rotate to the left).

我的代码

func rotatedView(recognizer:UIRotationGestureRecognizer){
    let pi = CGFloat(M_PI)
    rotateView.transform = CGAffineTransformMakeRotation(pi/2)
    recognizer.rotation = 0
    if recognizer.state == UIGestureRecognizerState.Changed {
        print("rotation began")
    }
    else {
        print("rotation ended")
    }
}

如何修改以上代码以允许基于手势在任一方向上旋转90度?

How can I modify the above code to allow for 90 degree rotation increments in either direction based on gesture?

推荐答案

我是通过以下方式实现的:

I achieved this by implementing it as follows:

@IBAction func handleRotation(_ recognizer: UIRotationGestureRecognizer) {
    if let recognizerView = recognizer.view {
        recognizerView.transform = recognizerView.transform.rotated(by: recognizer.rotation)
        recognizer.rotation = 0

        let radians:Double = atan2( Double(recognizerView.transform.b), Double(recognizerView.transform.a))
        let degrees = radians * Double((180 / Float.pi))

        if recognizer.state == .ended || recognizer.state == .cancelled {
            var degreeToAnimate:CGFloat = 0

            switch degrees {
            case -45...45:
                print("the default value 0, no need to any assign...")
            case 46...135:
                degreeToAnimate = CGFloat(M_PI_2)
            case 136...180, -180 ... -136:
                degreeToAnimate = CGFloat(M_PI)
            case -135 ... -46:
                degreeToAnimate = CGFloat(-M_PI_2)
            default:
                print("!")
            }

            UIView.animate(withDuration: 0.3, delay: 0.0, usingSpringWithDamping: 0.6, initialSpringVelocity: 1.0, options: .curveEaseIn, animations: {
                recognizerView.transform = CGAffineTransform(rotationAngle: degreeToAnimate)
            }, completion: { _ in
                recognizer.rotation = 0
            })
        }
    }
}

请注意，我已在Interface Builder中的所需视图上添加了UIRotationGestureRecognizer，这就是该函数为@IBAction的原因.

Note that I added the UIRotationGestureRecognizer on the desired view from the Interface Builder, that's why the function is an @IBAction.

输出:

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