Swift基础之显示波纹样式

最近项目用到了蓝牙连接，搜索设备的内容，其中需要搜索过程中出现波纹的动画效果，在这里将项目中OC语言编写的这种动画效果，转换成Swift编写，下面简单介绍说明一下代码。

这里用到了两种方法实现波纹效果，一种是波纹持续显示，一种是点击以后出现一次波纹的效果

首先是第一种，持续显示波纹

这个内容是重写绘图方法，override func drawRect(rect: CGRect){ }

首先需要设置显示波纹的数量，然后运用for循环进行创建，动画效果，并且添加到layer上

let pulsingCountT:NSInteger = 4;
        let animationDurationN:Double = 4;
        let animationLayerR = CALayer.init();
        for i in 0 ..< pulsingCountT {
            let pulsingLayer = CALayer.init();
            pulsingLayer.frame = CGRectMake(0, 0, rect.size.width, rect.size.height);
            pulsingLayer.borderColor = UIColor.redColor().CGColor;
            pulsingLayer.borderWidth = 1;
            pulsingLayer.cornerRadius = rect.size.height/2;

            let defaultCurveE = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionDefault);

            let animationGroupP = CAAnimationGroup.init();
            animationGroupP.fillMode = kCAFillModeBackwards;
            animationGroupP.beginTime = CACurrentMediaTime() + Double(i) * animationDurationN / Double(pulsingCountT);
            animationGroupP.duration = animationDurationN;
            animationGroupP.repeatCount = HUGE;
            animationGroupP.timingFunction = defaultCurveE;

            let scaleAnimationN = CABasicAnimation.init(keyPath: “transform.scale”);
            scaleAnimationN.fromValue = 1.4;
            scaleAnimationN.toValue = 2.2;

            let opacityAnimationN = CAKeyframeAnimation.init(keyPath: “opacity”);
            opacityAnimationN.values = [1,0.9,0.8,0.7,0.6,0.5,0.4,0.3,0.2,0.1,0];
            opacityAnimationN.keyTimes = [0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1];

            animationGroupP.animations = [scaleAnimationN,opacityAnimationN];
            pulsingLayer.addAnimation(animationGroupP, forKey: “plulsing”);
            animationLayerR.addSublayer(pulsingLayer);

        }
        self.layer.addSublayer(animationLayerR);

绘图完成后，进行添加

//圈视图
        circleV = CircleView.init();
        circleV.frame = CGRectMake(100, 60, 100, 100);
        circleV.hidden = true;
        circleV.backgroundColor = UIColor.clearColor();
        self.view.addSubview(circleV);
        //类方法的调用，只能类本事调用，与OC中的类方法（加号）形式一样
        CircleView.showLogStr();

        //点击出现圈视图,第一种持续扩散的圈
        let button1 = UIButton.init(frame: CGRectMake(100, 60, 100, 100));
        button1.setTitle(“开启搜索”, forState: .Normal);
        button1.backgroundColor = UIColor.yellowColor();
        button1.layer.cornerRadius = 50;
        button1.clipsToBounds = true;
        button1.setTitleColor(UIColor.blueColor(), forState: .Normal);
        button1.addTarget(self, action: #selector(button1Click), forControlEvents: .TouchUpInside);
        self.view.addSubview(button1);

//按钮的点击事件
    func button1Click(btn:UIButton) {
        circleV.hidden = false;
    }

然后是实现点击出现一次波纹的效果

这里用到了类似于OC中类别category文件的实现，使用extension创建类似于类别文件:extension UIView { }

//创建可点击出现的圆圈方法，参数一：表示圈的颜色，参数二：表示圈相对于View扩散的比例大小
    func showCircleAnimationLayerWithColor(circleColor:UIColor,andScale aScale:CGFloat){
        if (self.superview == false) && (circleColor == true) {
            return;
        }

        let pathFrameE = CGRectMake(-CGRectGetMidX(self.bounds), -CGRectGetMidY(self.bounds), self.bounds.size.width, self.bounds.size.height);

        let pathH = UIBezierPath.init(roundedRect: pathFrameE, cornerRadius: self.layer.cornerRadius);

        let shapePositionN = self.superview?.convertPoint(self.center, fromView: self.superview);

        //内圈1
        let circleShapeE1 = CAShapeLayer.init();
        circleShapeE1.path = pathH.CGPath;
        circleShapeE1.position = shapePositionN!;
        circleShapeE1.fillColor = UIColor.clearColor().CGColor;
        //不透明
        circleShapeE1.opacity = 0;
        circleShapeE1.strokeColor = circleColor.CGColor;
        circleShapeE1.lineWidth = 0.6;
        self.superview?.layer.addSublayer(circleShapeE1);

        let scaleAnimationN1 = CABasicAnimation.init(keyPath: “transform.scale”);
        scaleAnimationN1.fromValue = NSValue.init(CATransform3D: CATransform3DIdentity);
        scaleAnimationN1.toValue = NSValue.init(CATransform3D: CATransform3DMakeScale(aScale, aScale, 1));
        scaleAnimationN1.duration = 2;
        scaleAnimationN1.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionLinear);
        circleShapeE1.addAnimation(scaleAnimationN1, forKey: nil);

        let alphaAnimationN1 = CABasicAnimation.init(keyPath: “opacity”);
        alphaAnimationN1.fromValue = 1;
        alphaAnimationN1.toValue = 0;
        alphaAnimationN1.duration = 1.8;
        alphaAnimationN1.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionEaseOut);
        circleShapeE1.addAnimation(alphaAnimationN1, forKey: nil);

        //内圈2
        let circleShapeE2 = CAShapeLayer.init();
        circleShapeE2.path = pathH.CGPath;
        circleShapeE2.position = shapePositionN!;
        circleShapeE2.fillColor = circleColor.CGColor;
        //不透明
        circleShapeE2.opacity = 0;
        circleShapeE2.strokeColor = UIColor.clearColor().CGColor;
        circleShapeE2.lineWidth = 0;
        self.superview?.layer.insertSublayer(circleShapeE2, atIndex: 0);

        let scaleAnimationN2 = CABasicAnimation.init(keyPath: “transform.scale”);
        scaleAnimationN2.fromValue = NSValue.init(CATransform3D: CATransform3DIdentity);
        scaleAnimationN2.toValue = NSValue.init(CATransform3D: CATransform3DMakeScale(aScale, aScale, 1));
        scaleAnimationN2.duration = 2;
        scaleAnimationN2.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionLinear);
        circleShapeE2.addAnimation(scaleAnimationN2, forKey: nil);

        let alphaAnimationN2 = CABasicAnimation.init(keyPath: “opacity”);
        alphaAnimationN2.fromValue = 0.8;
        alphaAnimationN2.toValue = 0;
        alphaAnimationN2.duration = 1.7;
        alphaAnimationN2.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionEaseOut);
        circleShapeE2.addAnimation(alphaAnimationN2, forKey: nil);

        //线程
        let timeE:dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, 2*Int64(NSEC_PER_SEC));
        dispatch_after(timeE, dispatch_get_main_queue()) {
            circleShapeE1.removeFromSuperlayer();
            circleShapeE2.removeFromSuperlayer();
        };
    }

方法的调用：

//第二种方式，点击出现一个圈视图,而不是持续
        let button2 = UIButton.init(frame: CGRectMake(100, 270, 120, 60));
        //根据width与height，1：2的比例创建一个椭圆视图
        button2.updateMaskToBounds(button2.bounds);
        button2.setTitle(“点击”, forState: .Normal);
        button2.backgroundColor = UIColor.yellowColor();
        //button2.layer.cornerRadius = 30;
        button2.clipsToBounds = true;
        button2.setTitleColor(UIColor.blueColor(), forState: .Normal);
        button2.addTarget(self, action: #selector(button2Click), forControlEvents: .TouchUpInside);
        self.view.addSubview(button2);

按钮点击方法

func button2Click(btn:UIButton) {
btn.showCircleAnimationLayerWithColor(UIColor.whiteColor(), andScale: 3);
}

效果图：