图片合成，部分截屏，不规则图片

项目介绍：

图片合成，部分截屏，不规则图片，简单实用

主要代码如下：
[Objective-C] 查看源文件 复制代码

class ViewController: UIViewController {
    @IBOutlet weak var changeImgButton: UIButton!
    var showImg: UIImage? {
        didSet {
            if showImg != nil {
               self.view.layer.contents = showImg?.CGImage
            }
        }
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.setShowImg()
        self.view.bringSubviewToFront(self.changeImgButton)
    }
    
    func setShowImg() {
        let img1 = UIImage.init(named: "big")
        let img2 = UIImage.init(named: "small")
        showImg = self.createImage(Image1: img1!, Image2: img2!)
    }
    
    @IBAction func changeImg(sender: UIButton) {
        sender.selected = !sender.selected
        if sender.selected {
            showImg = self.imageAtFrame(CGRectMake(0, 0, 200, 200))
        }
        else {
            self.setShowImg()
            self.anomalyPictture(Image: showImg!)
        }
    }
    
    func createImage(Image1 image1: UIImage,Image2 image2: UIImage) -> UIImage{
        print(image1.size)
        print(self.view.bounds)
        UIGraphicsBeginImageContext(image1.size)
        image1.drawInRect(CGRectMake(0, 0, image1.size.width, image1.size.height))
        image2.drawInRect(CGRectMake(20, 20, 100, 100))
        let resultImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return resultImage!
    }
  /*
    截图
    */
    func imageAtFrame(frame: CGRect) -> UIImage {
        UIGraphicsBeginImageContext(self.view.bounds.size)
        let context = UIGraphicsGetCurrentContext()
        //将下面两行去掉全屏截图
        CGContextSaveGState(context)
        UIRectClip(frame)
        //
        self.view.layer.renderInContext(context!)
        let newImg = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return newImg
    }
    
    func anomalyPictture(Image image: UIImage) {
        let maskLayer = CAShapeLayer.init()
        maskLayer.path = UIBezierPath.init(ovalInRect: CGRectMake(0, 0, 200, 300)).CGPath
        maskLayer.fillColor = UIColor.greenColor().CGColor
        maskLayer.strokeColor = UIColor.orangeColor().CGColor
        maskLayer.lineWidth = 10
        let contentLayer = CALayer.init()
        contentLayer.mask = maskLayer
        contentLayer.bounds = CGRectMake(0, 0, 200, 300)
        contentLayer.position = CGPointMake(self.view.center.x, self.view.center.y)
        contentLayer.backgroundColor = UIColor.redColor().CGColor
        contentLayer.contents = image.CGImage
        self.view.layer.addSublayer(contentLayer)
    }
}

DEMO下载：

TestPictures.zip
(908.68 KB, 下载次数: 276)

2016-7-12 16:29 上传
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