如何将蒙版应用于保存图像（swift3）
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【中文标题】如何将蒙版应用于保存图像（swift3）【英文标题】：How to apply mask to a save image (swift3) 【发布时间】：2017-04-04 14:20:36 【问题描述】：我的代码执行以下操作：
-
拍照并在图像视图中显示。
在照片库中使用 cgrect 以自定义大小保存图像视图。
但是我的问题是掩码没有被转移到l?.draw(in: CGRect(x: 10, y: 240.5, width: 435 , height: 435), blendMode: .normal, alpha: 1.0)。我要做的就是保存带有蒙版的照片。
import UIKit
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate
var screenView: UIImageView!
var image1 = UIImage(named: "w")
var image3 = UIImage(named: "w")
var image2 = UIImage(named: "w")
func cropImageIntoQuarterSquare(image: UIImage) -> UIImage?
let originalImageSize: CGSize = image.size
let smallImageSize = CGSize(width: (originalImageSize.width + 40), height: (originalImageSize.height + 40))
UIGraphicsBeginImageContext(smallImageSize)
image.draw(at: CGPoint.zero)
let imageResult = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return imageResult
var currentImageView: UIImageView?
@IBOutlet var photoDispaly: UIImageView!
override func viewDidLoad()
super.viewDidLoad()
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
self.currentImageView?.image = image
self.dismiss(animated: true)
func saveImage(image1: UIImage, image2: UIImage, image3: UIImage) -> UIImage?
screenView = UIImageView()
let newSize = CGSize(width: 900, height: 1200)
UIGraphicsBeginImageContextWithOptions(newSize, false, 0)
defer UIGraphicsEndImageContext()
UIColor.black.setFill()
UIBezierPath(rect: CGRect(origin: .zero, size: newSize)).fill()
UIGraphicsGetImageFromCurrentImageContext()
let l = photoDispaly.image
let image = photoDispaly.image
let maskingImage = UIImage(named: "mask5")
photoDispaly.image = maskImage(image: image!, mask: maskingImage!)
photoDispaly.autoresizingMask = [.flexibleWidth, .flexibleHeight, .flexibleBottomMargin, .flexibleRightMargin, .flexibleLeftMargin, .flexibleTopMargin]
photoDispaly.contentMode = .scaleAspectFit // OR .scaleAspectFill
photoDispaly.clipsToBounds = true
l?.draw(in: CGRect(x: 10, y: 240.5, width: 435 , height: 435), blendMode: .normal, alpha: 1.0)
let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
screenView.frame = CGRect(x:0, y: 0, width: self.view.frame.width, height: self.view.frame.height)
self.view.addSubview(screenView)
return newImage
@IBAction func takePhot(_ sender: Any)
self.currentImageView = self.photoDispaly
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera)
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.camera;
imagePicker.allowsEditing = false
self.present(imagePicker, animated: true, completion: nil)
func maskImage(image:UIImage, mask:(UIImage))->UIImage
let imageReference = image.cgImage
let maskReference = mask.cgImage
let imageMask = CGImage(maskWidth: maskReference!.width,
height: maskReference!.height,
bitsPerComponent: maskReference!.bitsPerComponent,
bitsPerPixel: maskReference!.bitsPerPixel,
bytesPerRow: maskReference!.bytesPerRow,
provider: maskReference!.dataProvider!, decode: nil, shouldInterpolate: true)
let maskedReference = imageReference!.masking(imageMask!)
let maskedImage = UIImage(cgImage:maskedReference!)
return maskedImage
func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer)
if let error = error
return
else
return
@IBAction func savePhoto(_ sender: Any)
guard let croppedImage = cropImageIntoQuarterSquare(image: image2!),
let combinedImage = saveImage(image1: image1!, image2: croppedImage, image3: croppedImage) else
return
UIImageWriteToSavedPhotosAlbum(combinedImage, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
【问题讨论】：
快速提示：将 cmets 添加到您的代码中以帮助其他人了解它应该做什么（也可以帮助您了解哪些是不在做您认为应该做的事情）。此外，如果您显示您尝试使用的“面具”图像以及您期望的结果，这将有所帮助。 我发现代码必须在 funccropImageIntoQuarterSquare 中 【参考方案1】：import UIKit
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate
var screenView: UIImageView!
var image1 = UIImage(named: "w")
var image3 = UIImage(named: "w")
var image2 = UIImage(named: "w")
func cropImageIntoQuarterSquare(image: UIImage) -> UIImage?
let image = photoDispaly.image
let maskingImage = UIImage(named: "mask5")
photoDispaly.image = maskImage(image: image!, mask: maskingImage!)
photoDispaly.autoresizingMask = [.flexibleWidth, .flexibleHeight, .flexibleBottomMargin, .flexibleRightMargin, .flexibleLeftMargin, .flexibleTopMargin]
photoDispaly.contentMode = .scaleAspectFit // OR .scaleAspectFill
photoDispaly.clipsToBounds = true
let originalImageSize: CGSize = image!.size
let smallImageSize = CGSize(width: (originalImageSize.width + 40), height: (originalImageSize.height + 40))
UIGraphicsBeginImageContext(smallImageSize)
image?.draw(at: CGPoint.zero)
let imageResult = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return imageResult
var currentImageView: UIImageView?
@IBOutlet var photoDispaly: UIImageView!
override func viewDidLoad()
super.viewDidLoad()
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
self.currentImageView?.image = image
self.dismiss(animated: true)
func saveImage(image1: UIImage, image2: UIImage, image3: UIImage) -> UIImage?
screenView = UIImageView()
let newSize = CGSize(width: 900, height: 1200)
UIGraphicsBeginImageContextWithOptions(newSize, false, 0)
defer UIGraphicsEndImageContext()
UIColor.black.setFill()
UIBezierPath(rect: CGRect(origin: .zero, size: newSize)).fill()
UIGraphicsGetImageFromCurrentImageContext()
let l = photoDispaly.image
l?.draw(in: CGRect(x: 10, y: 240.5, width: 435 , height: 435), blendMode: .normal, alpha: 1.0)
let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
screenView.frame = CGRect(x:0, y: 0, width: self.view.frame.width, height: self.view.frame.height)
self.view.addSubview(screenView)
return newImage
@IBAction func takePhot(_ sender: Any)
self.currentImageView = self.photoDispaly
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera)
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.camera;
imagePicker.allowsEditing = false
self.present(imagePicker, animated: true, completion: nil)
func maskImage(image:UIImage, mask:(UIImage))->UIImage
let imageReference = image.cgImage
let maskReference = mask.cgImage
let imageMask = CGImage(maskWidth: maskReference!.width,
height: maskReference!.height,
bitsPerComponent: maskReference!.bitsPerComponent,
bitsPerPixel: maskReference!.bitsPerPixel,
bytesPerRow: maskReference!.bytesPerRow,
provider: maskReference!.dataProvider!, decode: nil, shouldInterpolate: true)
let maskedReference = imageReference!.masking(imageMask!)
let maskedImage = UIImage(cgImage:maskedReference!)
return maskedImage
func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer)
if let error = error
return
else
return
@IBAction func savePhoto(_ sender: Any)
guard let croppedImage = cropImageIntoQuarterSquare(image: image1!),
let combinedImage = saveImage(image1: image1!, image2: croppedImage, image3: croppedImage)
else
return
UIImageWriteToSavedPhotosAlbum(combinedImage, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
【讨论】：
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