1、思路：

新建一個view，添加shape，給予一個動畫實現。

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2、效果圖：

效果1:

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效果2:

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gif有點卡，代碼運行不會這樣。

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3、源碼（整個類放進來的）

效果1源碼：

// // YJDownloadingCircle.swift // k12_sl_iOS // // Created by liyajun on 2017/7/13. // // import UIKitclass YJDownloadingCircle: UIView {var loadingLayer:CAShapeLayer! = niloverride init(frame: CGRect) {super.init(frame: frame)initViews()}required init?(coder aDecoder: NSCoder) {super.init(coder: aDecoder)initViews()}override func awakeFromNib() {initViews()}func initViews() {backgroundColor = UIColor.white}func drawHalfCircle() {loadingLayer = self.drawCircle()loadingLayer.strokeStart = 0.0loadingLayer.strokeEnd = 0.75let basicAni = CABasicAnimation(keyPath: "transform.rotation.z")basicAni.fromValue = 0.0basicAni.toValue = M_PI*2basicAni.duration = 0.5basicAni.repeatCount = MAXFLOATbasicAni.autoreverses = falsebasicAni.fillMode = kCAFillModeForwardsself.layer.add(basicAni, forKey: nil)}private func drawCircle() -> CAShapeLayer {let circleLayer = CAShapeLayer()let rect = CGRect(x: 0, y: 0, width: self.frame.size.width, height: self.frame.size.height)circleLayer.frame = rectcircleLayer.position = CGPoint(x: self.frame.size.width/2, y: self.frame.size.height/2)circleLayer.fillColor = UIColor.clear.cgColorcircleLayer.lineWidth = 1circleLayer.strokeColor = UIColor.colorWithHex(hex: "FF3B30").cgColorlet bezier = UIBezierPath(ovalIn: rect)circleLayer.path = bezier.cgPathself.layer.addSublayer(circleLayer)return circleLayer} } View Code

使用方法

//定義屬性var circle:YJDownloadingCircle! = nil override func viewDidLoad() {super.viewDidLoad()view.backgroundColor = UIColor.whitecircle = YJDownloadingCircle(frame: CGRect(x: 100, y: 100, width: 36, height: 36))circle.drawHalfCircle()self.view.addSubview(circle)}

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效果2源碼：

// // LoginLoadingView.swift // k12_sl_iOS // // Created by liyajun on 2018/5/30. // import UIKitclass LoginLoadingView: UIView {var bgShape:CAShapeLayer! = nilvar runShape:CAShapeLayer! = nilvar lblShape:CAShapeLayer! = nillet startAngle:CGFloat = 0;let endAngle:CGFloat = CGFloat(0.67 * M_PI);let lineWidth:CGFloat = 5;override init(frame: CGRect) {super.init(frame: frame)setup()}required init?(coder aDecoder: NSCoder) {super.init(coder: aDecoder)setup()}func setup() {bgShape = CAShapeLayer()let bgPath = CGMutablePath()bgPath.addEllipse(in: CGRect(x: 0, y: 0, width: self.width, height: self.height))bgShape.fillColor = UIColor.clear.cgColorbgShape.strokeColor = UIColor.colorWithHex("4CD964").withAlphaComponent(0.5).cgColorbgShape.lineWidth = lineWidthbgShape.lineJoin = kCALineJoinRoundbgShape.lineDashPattern = [NSNumber(value: 4),NSNumber(value:4)]bgShape.path = bgPathself.layer.addSublayer(bgShape)runShape = CAShapeLayer()let runPath = UIBezierPath(arcCenter: CGPoint(x: 0, y: 0), radius: self.width/2, startAngle: startAngle, endAngle: endAngle, clockwise: false)runShape.fillColor = UIColor.clear.cgColorrunShape.strokeColor = UIColor.colorWithHex("4CD964").cgColorrunShape.lineWidth = lineWidthrunShape.lineJoin = kCALineJoinRoundrunShape.path = runPath.cgPathrunShape.position = CGPoint(x: self.width/2, y: self.width/2)self.layer.addSublayer(runShape)let anima = CABasicAnimation(keyPath: "transform.rotation.z")anima.fromValue = 0anima.toValue = M_PI*2anima.repeatCount = MAXFLOATanima.duration = 2.0anima.isRemovedOnCompletion = falserunShape.add(anima, forKey: "rotationAnnimation")lblShape = CAShapeLayer()let gouPath = UIBezierPath()gouPath.move(to: CGPoint(x: self.width/2-10, y: self.width/2-1))gouPath.addLine(to: CGPoint(x: self.width/2, y: self.width/2+10))gouPath.addLine(to: CGPoint(x: self.width/2+15, y: self.width/2-10))lblShape.fillColor = UIColor.clear.cgColorlblShape.strokeColor = UIColor.colorWithHex("4CD964").cgColorlblShape.lineWidth = lineWidthlblShape.lineJoin = kCALineJoinRoundlblShape.path = gouPath.cgPathself.layer.addSublayer(lblShape)}} View Code

使用時，直接init出來就是了

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以上的效果都是只有一個類文件（UIView），使用時直接拷貝即可。

其中，關于轉圈的前景色、背景色等參數，我沒抽出來，大家如果有這需求，可以改一下。

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代碼是Swift實現加載轉圈效果。

如果是OC，參考代碼思路即可。

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enjoy～

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轉載于:https://www.cnblogs.com/yajunLi/p/7159607.html

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