swift 如何在相机上添加圆形遮罩

Question

现在我是 swift 新手，但我想学习如何在 swift 中的相机上添加圆形遮罩。现在我正在使用 Xcode7.2.1，swift 2.1，但我对此一无所知。我正在通过使用 https://github.com/imaginary-cloud/CameraManager 作为第三方库来开发这个相机应用程序。在这里，我想在相机上添加我的自定义圆形遮罩。我想知道谁能帮我得到这个！谢谢

Answer 1

UIImagePickerController 有一个 cameraOverlayView 属性，您可以使用它来提供将充当叠加层的自定义视图。下面的示例创建了一个正方形的叠加视图。试用它以获得您想要的。

@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)

}

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