iOS 任意切割图片

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iOS 任意切割图片

自定义圆形

通过一个镂空的模板选中想要切割的部分, 然后生成图片

必要的属性,  和蒙版 以及要切割的图片. (胖迪)

    var imageview = UIImageView.init()
    var bezeier : UIBezierPath!
    var maskView : UIView!
    var circlepath : UIBezierPath!
    var shaplayer : CAShapeLayer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.white
        self.view.addSubview(imageview)
        self.imageview.frame = self.view.bounds
        self.imageview.image = UIImage.init(named: "rb02.jpg")
        
        
        maskView = UIView.init()
        maskView.frame = self.view.frame
                self.imageview.addSubview(maskView)
        maskView.backgroundColor = UIColor.gray
        maskView.alpha = 0.8
        addrightBtn()
    }

生成圆形选中区域的方法 circle()

    func cicle() {
        
        self.bezeier = UIBezierPath.init(rect: self.imageview.frame)
        
        self.circlepath = UIBezierPath.init(arcCenter: CGPoint.init(x: 150, y: 300), radius: 100, startAngle: 0, endAngle: CGFloat(Double.pi * 2.0), clockwise: false)
        self.bezeier.append(self.circlepath)
        
        shaplayer = CAShapeLayer.init()
        
        shaplayer.path = self.bezeier.cgPath
        maskView.layer.mask = shaplayer
        
    }
    

效果图

重写界面touchmove 方法,  将镂空的圆可以移动.

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        
                self.bezeier.removeAllPoints()
        
                let p = touches.first?.location(in: self.view)
                self.bezeier = UIBezierPath.init(rect: self.imageview.frame)
        
                self.circlepath =  UIBezierPath.init(arcCenter: p!, radius: 100, startAngle: 0, endAngle: CGFloat(Double.pi * 2.0), clockwise: false)
                self.bezeier.append(self.circlepath)
                shaplayer.path = self.bezeier.cgPath
    }

生成图片的方法

    func addrightBtn() {
        let btn:UIBarButtonItem = UIBarButtonItem.init(title: "生成", style: .plain, target: self, action: #selector(btnaction))
        
        self.navigationItem.rightBarButtonItem = btn
    }
    @objc func btnaction() {
        UIGraphicsBeginImageContextWithOptions(self.imageview.frame.size, false, 1)
        
                let bezier = self.circlepath
        
//        let bezier = self.bezeier
        
        bezier?.addClip()

        let image = UIImage.init(named: "rb02.jpg")
        image?.draw(in: self.imageview.frame)
        
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        self.imageview.image = newImage
        UIGraphicsEndImageContext()
        
    }

效果图

自定义曲线抠图

重写touchmove 绘制滑动曲线

        let p = touches.first?.location(in: self.view)
        if self.bezeier == nil {
            self.bezeier = UIBezierPath.init()
        }
        if self.bezeier.isEmpty {
            self.bezeier.move(to: p!)
        }
        if shaplayer == nil {
            shaplayer = CAShapeLayer.init()
        }
        self.bezeier.addLine(to: p!)
        shaplayer.path = self.bezeier.cgPath
        shaplayer.fillColor = nil
        shaplayer.lineWidth = 3
        shaplayer.strokeColor = UIColor.red.cgColor

        self.imageview.layer.addSublayer(shaplayer)

生成图片的方法, 封闭曲线选择自定的bezier 而不是 那个 circle

    @objc func btnaction() {
        UIGraphicsBeginImageContextWithOptions(self.imageview.frame.size, false, 1)
        
        
        /// 拿到圆圈的封闭区域
//        let bezier = self.circlepath;
        
        /// 拿到自定义曲线的封闭区域
        let bezier = self.bezeier
        
        bezier?.addClip()
        
        
        let image = UIImage.init(named: "rb02.jpg")
        image?.draw(in: self.imageview.frame)
        
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        
        
        self.imageview.image = newImage
        UIGraphicsEndImageContext()
        
    }

效果图