如何制作UIView的渐变边框? [英] how to make a gradient border of UIView?
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问题描述
我想制作一个如下图所示的渐变边框:
I want to make a gradient border of view like the following picture:
但我不知道它究竟是怎么做的,即我应该用它做什么渐变颜色?如何设置我的视图以显示像图像的边框?
but I don't know how do it exactly , i.e. what the gradient color I should use to do it? how to set my view to show a border like the image?
我使用以下代码获取边框:
I'm using the following code to get a border:
self.view.layer.borderColor = [UIColor orangeColor].CGColor;
self.view.layer.borderWidth = 2.0f;
推荐答案
这就是我做的和它完美的工作
This what i did and it worked perfectly
extension CALayer {
func addGradienBorder(colors:[UIColor],width:CGFloat = 1) {
let gradientLayer = CAGradientLayer()
gradientLayer.frame = CGRect(origin: CGPointZero, size: self.bounds.size)
gradientLayer.startPoint = CGPointMake(0.0, 0.5)
gradientLayer.endPoint = CGPointMake(1.0, 0.5)
gradientLayer.colors = colors.map({$0.CGColor})
let shapeLayer = CAShapeLayer()
shapeLayer.lineWidth = width
shapeLayer.path = UIBezierPath(rect: self.bounds).CGPath
shapeLayer.fillColor = nil
shapeLayer.strokeColor = UIColor.blackColor().CGColor
gradientLayer.mask = shapeLayer
self.addSublayer(gradientLayer)
}
}
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