Question

如何使用CAShapeLayer绘制具有边框颜色，边框宽度和填充颜色的线条？

这是我尝试过的，但它只是蓝色......

self.lineShape.strokeColor = [UIColor blueColor].CGColor;
self.lineShape.fillColor = [UIColor greenColor].CGColor;
self.lineShape.lineWidth = 100;
self.lineShape.lineCap = kCALineCapRound;
self.lineShape.lineJoin = kCALineJoinRound;
UIBezierPath* path = [UIBezierPath bezierPath];
[path moveToPoint:self.lineStart];
[path addLineToPoint:self.lineEnd];
self.lineShape.path = path.CGPath;

Answer 1

    self.lineShapeBorder = [[CAShapeLayer alloc] init];
    self.lineShapeBorder.zPosition = 0.0f;
    self.lineShapeBorder.strokeColor = [UIColor blueColor].CGColor;
    self.lineShapeBorder.lineWidth = 25;
    self.lineShapeBorder.lineCap = kCALineCapRound;
    self.lineShapeBorder.lineJoin = kCALineJoinRound;

    self.lineShapeFill = [[CAShapeLayer alloc] init];
    [self.lineShapeBorder addSublayer:self.lineShapeFill];
    self.lineShapeFill.zPosition = 0.0f;
    self.lineShapeFill.strokeColor = [UIColor greenColor].CGColor;
    self.lineShapeFill.lineWidth = 20.0f;
    self.lineShapeFill.lineCap = kCALineCapRound;
    self.lineShapeFill.lineJoin = kCALineJoinRound;

// ...

    UIBezierPath* path = [UIBezierPath bezierPath];
    [path moveToPoint:self.lineStart];
    [path addLineToPoint:self.lineEnd];
    self.lineShapeBorder.path = self.lineShapeFill.path = path.CGPath;

Answer 2

如果您将图层的fillColor属性设置为nil以外的其他属性或透明，则该图层将填充其路径。

如果您将图层的lineWidth设置为大于零的数字，并将其strokeColor设置为nil以外的其他值或透明，则该图层将描绘其路径。

如果设置了所有这些属性，图层将填充和描边的路径。它在填充后绘制笔划。

图层的路径实际上必须包含一些区域才能填充任何内容。在您的帖子中，您可以设置如下路径：

UIBezierPath* path = [UIBezierPath bezierPath];
[path moveToPoint:self.lineStart];
[path addLineToPoint:self.lineEnd];
self.lineShape.path = path.CGPath;

该路径包含单个线段。它不包含任何区域，因此该层无需填充。

Answer 3

在Swift 3. UIView的扩展方法。

// Usage:
self.btnGroup.roundCorner([.topRight, .bottomRight], radius: 4.0, borderColor: UIColor.red, borderWidth: 1.0)

// Apply round corner and border. An extension method of UIView.
public func roundCorner(_ corners: UIRectCorner, radius: CGFloat, borderColor: UIColor, borderWidth: CGFloat) {
    let path = UIBezierPath.init(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))

    let mask = CAShapeLayer()
    mask.path = path.cgPath
    self.layer.mask = mask

    let borderPath = UIBezierPath.init(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
    let borderLayer = CAShapeLayer()
    borderLayer.path = borderPath.cgPath
    borderLayer.lineWidth = borderWidth
    borderLayer.strokeColor = borderColor.cgColor
    borderLayer.fillColor = UIColor.clear.cgColor
    borderLayer.frame = self.bounds
    self.layer.addSublayer(borderLayer)
}

CAShapeLayer具有边框和填充颜色和圆角

3 个答案: