ios – 圆圈中的渐变色[复制]

概述参见英文答案 > iOS – Circle shaped gradient                                    6个 我必须创建一个带动画的圆圈,我已创建它,一切正常.我的问题是添加渐变色.请参考随附的屏幕截图 下面是我用动画制作圆圈的代码： let lineWidth: CGFloat = 20 dispatch_async(dispatch_ge 参见英文答案 > iOS – Circle shaped gradient                                    6个
我必须创建一个带动画的圆圈,我已创建它,一切正常.我的问题是添加渐变色.请参考随附的屏幕截图

下面是我用动画制作圆圈的代码：

let linewidth: CGfloat = 20      dispatch_async(dispatch_get_main_queue()) { () -> VoID in        let startAngle = -90.0        let endAngle = -90.01        let circlePath = UIBezIErPath(arcCenter: CGPoint(x: self.frame.wIDth/2,y: self.frame.height/2),radius: CGfloat(self.frame.wIDth/2 - (self.linewidth/2)),startAngle: CGfloat(((startAngle) / 180.0 * M_PI)),endAngle:CGfloat(((endAngle) / 180.0 * M_PI)),clockwise: true)        // Circle layer        let circleLayer = CAShapeLayer()        circleLayer.path = circlePath.CGPath        circleLayer.fillcolor = UIcolor.clearcolor().CGcolor        circleLayer.strokecolor = UIcolor.greencolor().CGcolor        circleLayer.strokeEnd = 94/100        circleLayer.linewidth = self.linewidth        circleLayer.zposition = 1        // Background circle layer        let circleBackgroundLayer = CAShapeLayer()        circleBackgroundLayer.path = circlePath.CGPath        circleBackgroundLayer.fillcolor = UIcolor.clearcolor().CGcolor        circleBackgroundLayer.strokecolor = UIcolor.lightgraycolor().CGcolor        circleBackgroundLayer.strokeEnd = 1.0        circleBackgroundLayer.linewidth = self.linewidth        circleBackgroundLayer.zposition = -1        self.layer.addSublayer(circleLayer)        self.layer.addSublayer(circleBackgroundLayer)        // Add Animation        let pathAnimation = CABasicAnimation(keyPath: "strokeEnd")        pathAnimation.duration = 0.55        pathAnimation.timingFunction = camediatimingFunction(name: kcamediatimingFunctionlinear)        pathAnimation.fromValue = 0        pathAnimation.tovalue = 94/100        circleLayer.addAnimation(pathAnimation,forKey: "strokeEnd")    }

我的问题是在上面的代码中我应该在哪里添加CAGradIEntLayer来添加渐变颜色.

下面的代码行是添加渐变颜色：

let gradIEnt: CAGradIEntLayer = CAGradIEntLayer()        gradIEnt.frame = CGRectMake(0,170,170)        gradIEnt.colors = [UIcolor(hexString: "#27C68A")().CGcolor,UIcolor(hexString: "#86EA26")().CGcolor]        gradIEnt.cornerRadius = gradIEnt.frame.wIDth/2        gradIEnt.startPoint = CGPoint(x: 0,y: 1)        gradIEnt.endPoint = CGPoint(x: 1,y: 0)        self.layer.insertSublayer(gradIEnt,atIndex: 0)

解决方法 如果你想要一个真实的渐变颜色模拟,你可以检查 this SO answer.它基于一个十字形,它将你的矩形视图分成4个部分,然后移动每个部分的颜色,以获得应用于图层蒙版的常规渐变. 总结

以上是内存溢出为你收集整理的ios – 圆圈中的渐变色[复制]全部内容，希望文章能够帮你解决ios – 圆圈中的渐变色[复制]所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。