点击按钮每次都能实现图片的旋转和切换（swift）

概述效果如图： 代码如下： // // ViewController.swift // TwoSidedView // // Created by mayl on 2017/12/14. // Copyr

效果如图：

代码如下：

////  VIEwController.swift//  TwoSIDedVIEw////  Created by mayl on 2017/12/14.//  copyright © 2017年. All rights reserved.//import UIKitlet gBtn = UIbutton.init(type: UIbuttonType.custom)let gimgV4BottomSIDe = UIImageVIEw.init(image: UIImage.init(named: "bottomSIDe"))let gimgV4topSIDe = UIImageVIEw.init(image: UIImage.init(named: "topSIDe"))var lBool4ChangeimgV : Bool = falseclass VIEwController: UIVIEwController {        overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        setUpUI()    }        func setUpUI()  {              vIEw.addSubvIEw(gBtn)        gBtn.addTarget(self,action: #selector(VIEwController.btnDIDClick),for: UIControlEvents.touchUpInsIDe)        gBtn.center = vIEw.center                gBtn.addSubvIEw(gimgV4BottomSIDe)        gBtn.layer.transform = CAtransform3DMakeRotation(CGfloat(Double.pi),1,0)                      gBtn.addSubvIEw(gimgV4topSIDe)                //按钮大小设置为与图片大小一致        gBtn.bounds = gimgV4BottomSIDe.bounds    }    @objc func btnDIDClick()  {        let lAni = CAKeyframeAnimation.init(keyPath: "transform.rotation.y")        lAni.duration = 1        lAni.values = [0,Double.pi];                //使得动画结束后，保持动画效果        lAni.isRemovedOnCompletion = false        lAni.fillMode = kCAFillModeForwards                lAni.delegate = self;                gBtn.layer.add(lAni,forKey: nil)    }}extension UIVIEwController: CAAnimationDelegate{    public func animationDIDStart(_ anim: CAAnimation) {        let lDur:CFTimeInterval = anim.duration        dispatchQueue.main.asyncAfter(deadline: dispatchTime.Now() + lDur * 0.5) {            gBtn.bringSubvIEw(toFront: lBool4ChangeimgV == false ? gimgV4BottomSIDe : gimgV4topSIDe)            lBool4ChangeimgV = !lBool4ChangeimgV        }    }}

素材：

 

 

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