CAShapeLayer中的多个路径
我想知道是否有可能让CAShapeLayer描边超过一条路径，因为它实际上只需要一条路径作为参数：
CAShapeLayer* myLayer=[CAShapeLayer layer]; myLayer.path=myBezierPath 但是如果我想在这一层上划出多条路径呢？
使用
void CGPathAddPath ( CGMutablePathRef path1, // The mutable path to change. const CGAffineTransform *m, // A pointer to an affine transformation matrix, or NULL if no transformation is needed. If specified, Quartz applies the transformation to path2 before it is added to path1. CGPathRef path2 // The path to add. );
代码示例：
CGMutablePathRef combinedPath = CGPathCreateMutableCopy(path.CGPath); CGPathAddPath(combinedPath, NULL, path2.CGPath); CGPathAddPath(combinedPath, NULL, path3.CGPath); CGPathAddPath(combinedPath, NULL, path4.CGPath); myLayer.path = combinedPath;
另一种方法是追加这样的路径……
UIBezierPath *left_path = [UIBezierPath bezierPathWithRect:frame_left]; UIBezierPath *right_path = [UIBezierPath bezierPathWithRect:frame_right]; [left_path appendPath:right_path]; CAShapeLayer *shapeLayer = [CAShapeLayer layer]; shapeLayer.path = left_path.CGPath;
好的，我自己发现了。 一个人可以做到：
CGMutablePathRef combinedPath= CGPathCreateMutableCopy(path.CGPath); CGPathAddPath(combinedPath, NULL, path2.CGPath); CGPathAddPath(combinedPath, NULL, path3.CGPath); CGPathAddPath(combinedPath, NULL, path4.CGPath); myLayer.path=combinedPath;
import UIKit import QuartzCore import CoreGraphics class ViewController: UIViewController,UIGestureRecognizerDelegate { var btnview : UIButton! var buttonCenter = CGPoint.zero var firstlayerpoint = CGPoint.zero var firstLayer = CAShapeLayer() var secondLayer = CAShapeLayer() var thirdLayer = CAShapeLayer() var initialPosition = CGRect() let label = UILabel() @IBOutlet weak var nameLabel: UILabel! @IBOutlet weak var blueLabel: UILabel! @IBOutlet weak var greenLabel: UILabel! @IBOutlet weak var redLabel: UILabel! override func viewDidLoad() { super.viewDidLoad() firstLayer = self.createCircleWithBounds(bounds: CGRect(x:0, y:0, width:100,height:100), Position: self.view.center, StrokeColor: UIColor.blue, LineWidth: 20.0) firstLayer.strokeStart = 0.00 firstLayer.strokeEnd = 0.33 self.view.layer.addSublayer(firstLayer) secondLayer = self.createCircleWithBounds(bounds: CGRect(x:0, y:0, width:100,height:100), Position: self.view.center, StrokeColor: UIColor.red, LineWidth: 20.0) secondLayer.strokeStart = 0.33 secondLayer.strokeEnd = 0.66 self.view.layer.addSublayer(secondLayer) thirdLayer = self.createCircleWithBounds(bounds: CGRect(x:0, y:0, width:100,height:100), Position: self.view.center, StrokeColor: UIColor.green, LineWidth: 20.0) thirdLayer.strokeStart = 0.66 thirdLayer.strokeEnd = 1.00 self.view.layer.addSublayer(thirdLayer) btnview = UIButton(frame: CGRect(x: self.view.center.x - 20 , y: self.view.center.y - 20 , width: 40, height: 40)) btnview.backgroundColor = UIColor.gray btnview.isUserInteractionEnabled = true let panGesture = UIPanGestureRecognizer(target: self, action: #selector(self.panButton(panGesture:))) // panGesture.minimumNumberOfTouches = 1 btnview.addGestureRecognizer(panGesture) self.view.addSubview(btnview) // Do any additional setup after loading the view, typically from a nib. nameLabel.isHidden = true blueLabel.isHidden = true greenLabel.isHidden = true redLabel.isHidden = true } func panButton(panGesture: UIPanGestureRecognizer) { //let translation = panGesture.translation(in: self.btnview) panGesture.view!.center = btnview.center panGesture.setTranslation(CGPoint.zero, in: self.view) // var point = CGPoint.zero // point = firstLayer.frame.size.center if panGesture.state == .began { label.isHidden = false buttonCenter = btnview.center // store old button center } else if panGesture.state == .ended || panGesture.state == .failed || panGesture.state == .cancelled { print(btnview.frame.origin.x) print(greenLabel.frame.origin.x) if btnview.frame.origin.x > greenLabel.frame.origin.x { // lblflayer.isHidden = false // lblsecondlayer.isHidden = true // lblthirdlayer.isHidden = true nameLabel.isHidden = false nameLabel.text = "Blue" nameLabel.backgroundColor = UIColor.blue } else if btnview.frame.origin.x > blueLabel.frame.origin.x { // print(btnview.frame.origin.x) // print(lblsecondlayer.frame.origin.x) // lblsecondlayer.isHidden = false // lblflayer.isHidden = true // lblthirdlayer.isHidden = true nameLabel.isHidden = false nameLabel.text = "Red" nameLabel.backgroundColor = UIColor.red } else if btnview.frame.origin.x > redLabel.frame.origin.x { print(btnview.frame.origin.x) print(redLabel.frame.origin.x) greenLabel.isHidden = true // lblsecondlayer.isHidden = true // lblthirdlayer.isHidden = false nameLabel.isHidden = false nameLabel.text = "Green" nameLabel.backgroundColor = UIColor.green } else { nameLabel.isHidden = true // lblflayer.isHidden = true // lblsecondlayer.isHidden = true // lblthirdlayer.isHidden = true } btnview.center = buttonCenter // restore button center } else { let location = panGesture.location(in: view) // get pan location btnview.center = location // set button to where finger is } } func createCircleWithBounds(bounds: CGRect, Position position: CGPoint, StrokeColor color: UIColor, LineWidth lineWidth: CGFloat) -> CAShapeLayer { //let shapelayer = CAShapeLayer.layer let shapelayer = CAShapeLayer() shapelayer.strokeColor = color.cgColor shapelayer.fillColor = UIColor.clear.cgColor shapelayer.path = UIBezierPath(roundedRect: bounds, cornerRadius: bounds.width / 2).cgPath shapelayer.bounds = bounds shapelayer.position = position shapelayer.lineCap = kCALineCapButt shapelayer.lineWidth = lineWidth return shapelayer } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. }
}
Swift 4.1版本@Kjuly的回答
在Swift中您可以使用CGMutablePath
代码示例：
let combinedPath = CGMutablePath() combinedPath.addPath(path1) combinedPath.addPath(path2) .... combinedPath.addPath(path_n) myLayer.path = combinedPath