iphone - 如何在swift上添加圆形蒙版在相机上

现在我是斯威夫特的新手，但我想学习如何在相机上添加圆形面具斯威夫特。
现在我使用的是xcode7.2.1和swift 2.1，但我不知道这一点。
我正在使用https://github.com/imaginary-cloud/CameraManager作为第三方库来开发这个摄像头应用程序。
在这里，我想在相机上添加我的自定义圆形蒙版。
我想知道谁能帮我弄到这个！
谢谢

最佳答案

UIImagePickerController有一个cameraOverlayView属性，您可以使用该属性提供一个自定义视图，该视图将用作覆盖。下面的示例创建一个正方形的覆盖视图。用它做实验，得到你想要的。

@IBAction func takePhoto(sender: AnyObject) {

    if !UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera){
        return
    }

    var imagePicker = UIImagePickerController()
    imagePicker.delegate = self
    imagePicker.sourceType = UIImagePickerControllerSourceType.Camera;

    //Create camera overlay
    let pickerFrame = CGRectMake(0, UIApplication.sharedApplication().statusBarFrame.size.height, imagePicker.view.bounds.width, imagePicker.view.bounds.height - imagePicker.navigationBar.bounds.size.height - imagePicker.toolbar.bounds.size.height)
    let squareFrame = CGRectMake(pickerFrame.width/2 - 200/2, pickerFrame.height/2 - 200/2, 200, 200)
    UIGraphicsBeginImageContext(pickerFrame.size)

    let context = UIGraphicsGetCurrentContext()
    CGContextSaveGState(context)
    CGContextAddRect(context, CGContextGetClipBoundingBox(context))
    CGContextMoveToPoint(context, squareFrame.origin.x, squareFrame.origin.y)
    CGContextAddLineToPoint(context, squareFrame.origin.x + squareFrame.width, squareFrame.origin.y)
    CGContextAddLineToPoint(context, squareFrame.origin.x + squareFrame.width, squareFrame.origin.y + squareFrame.size.height)
    CGContextAddLineToPoint(context, squareFrame.origin.x, squareFrame.origin.y + squareFrame.size.height)
    CGContextAddLineToPoint(context, squareFrame.origin.x, squareFrame.origin.y)
    CGContextEOClip(context)
    CGContextMoveToPoint(context, pickerFrame.origin.x, pickerFrame.origin.y)
    CGContextSetRGBFillColor(context, 0, 0, 0, 1)
    CGContextFillRect(context, pickerFrame)
    CGContextRestoreGState(context)

    let overlayImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext();

    let overlayView = UIImageView(frame: pickerFrame)
    overlayView.image = overlayImage
    imagePicker.cameraOverlayView = overlayView
    self.presentViewController(imagePicker, animated: true, completion: nil)

}

关于iphone - 如何在swift上添加圆形蒙版在相机上，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/35662840/