前言

开发中经常需要加载数据，这时候就需要一个加载动画，最近写了2个加载动画，希望对大家有所帮助。文章末尾有提供OC和Swift双语的下载，代码比较简单，就不详细解析了，Demo中已经进行封装，可以直接使用，这里贴出核心代码。

效果图

1.第一个

核心代码

private func initLayer() -> Void {        let origin_x: CGFloat = frame.size.width * 0.5        let origin_y: CGFloat = frame.size.height * 0.5        for item in 0 ..< defaultConfigure.number {            //创建layer            let scale: CGFloat = CGFloat(defaultConfigure.number + 1 - item) / CGFloat(defaultConfigure.number + 1)            let layer: CALayer = CALayer()            layer.backgroundColor = defaultConfigure.backgroundColor.cgColor            layer.frame = CGRect.init(x: -5000, y: -5000, width: scale * defaultConfigure.diameter, height: scale * defaultConfigure.diameter)            layer.cornerRadius = scale * defaultConfigure.diameter * 0.5;            //运动路径            let pathAnimation: CAKeyframeAnimation = CAKeyframeAnimation.init(keyPath: "position")            pathAnimation.calculationMode = .paced;            pathAnimation.fillMode = .forwards;            pathAnimation.isRemovedOnCompletion = false;            pathAnimation.duration = (defaultConfigure.duration) - Double((defaultConfigure.intervalDuration) * Double(defaultConfigure.number));            pathAnimation.beginTime = Double(item) * defaultConfigure.intervalDuration;            pathAnimation.timingFunction = CAMediaTimingFunction.init(name: .easeInEaseOut)            pathAnimation.path = UIBezierPath(arcCenter: CGPoint.init(x: origin_x, y: origin_y), radius: (self.frame.size.width - self.defaultConfigure.diameter) * 0.5, startAngle: defaultConfigure.startAngle, endAngle: defaultConfigure.endAngle, clockwise: true).cgPath            //动画组，动画组时间长于单个动画时间，会有停留效果            let group: CAAnimationGroup = CAAnimationGroup()            group.animations = [pathAnimation]            group.duration = defaultConfigure.duration            group.isRemovedOnCompletion = false            group.fillMode = .forwards            group.repeatCount = MAXFLOAT                        layer.add(group, forKey: "RotateAnimation")            layerArray.append(layer)        }    }复制代码

2.第二个

核心代码

override init(frame: CGRect) {        super.init(frame: frame)        width = frame.size.width        height = frame.size.height                layer.backgroundColor = configure.outBackgroundColor.cgColor        layer.mask = shapeLayer(lineWidth: configure.outLineWidth, start: 0, end: 1)        animationLayer.frame = layer.bounds        animationLayer.backgroundColor = configure.inBackgroundColor.cgColor        animationLayer.mask = shapeLayer(lineWidth: configure.inLineWidth, start: configure.strokeStart, end: configure.strokeEnd)        layer.addSublayer(animationLayer)        rotationAnimation.fromValue = 0        rotationAnimation.toValue = Double.pi * 2        rotationAnimation.repeatCount = MAXFLOAT        rotationAnimation.duration = configure.duration        rotationAnimation.isRemovedOnCompletion = false        rotationAnimation.fillMode = .forwards        rotationAnimation.timingFunction = CAMediaTimingFunction(name: .linear)    }复制代码

3.总结

核心代码已经贴出，完整代码请查看Demo，为了方便大家学习，这里提供了OC和Swift两种语言分别实现的----->>>，如果对你有所帮助，欢迎Star。