如何將圖像拉伸成自定義形狀（swift3）

Question

下面的代碼列表會裁剪圖像。我希望圖像能夠變形/拉伸，而不是在形狀上裁剪。所有的圖像內容仍然在變換後的圖像中。它只會看起來不同。

extension UIImageView { 
func addMask(_ bezierPath: UIBezierPath) { 
    let pathMask = CAShapeLayer() 
    pathMask.path = bezierPath.cgPath 
    layer.mask = pathMask 
} 
    } 


    let myPicture = UIImage(data: try! Data(contentsOf: URL(string:"https://scontent-iad3-1.xx.fbcdn.net/v/t31.0-8/14196150_10207770295835716_3510332720585393213_o.jpg?oh=fdb525410602f40f4735991b713e9c50&oe=596688E5")!))! 
    let iv = UIImageView(image: myPicture) 

    let bezierPath = UIBezierPath() 
    bezierPath.move(to: iv.center) 
    bezierPath.addLine(to: CGPoint(x: iv.frame.maxX, y: 0)) 
    bezierPath.addLine(to: CGPoint(x: iv.frame.maxX, y: iv.frame.maxY)) 
    bezierPath.addLine(to: CGPoint(x: 0, y: iv.frame.maxY)) 
    bezierPath.addLine(to: .zero) 
    bezierPath.close() 

iv.addMask(bezierPath) 

Answer 1

在這個線程看看：

Warp \ bend effect on a UIView?

有討論了幾個解決方案，包括使用核心圖像過濾器，或建立自己的「網經」用OpenGL。

還有Brad Larson open source framework GPUImage on Github。您可能可以使用該框架構建過濾器來執行您想要的操作。

Answer 2

時，你必須顯示你可以使用圖像濾芯或者你可以嘗試圖像屏蔽這種類型的圖像..

圖像核心過濾：秀：

https://www.appcoda.com/core-image-introduction

https://code.tutsplus.com/tutorials/ios-sdk-apply-photo-filters-with-core-image-in-swift--cms-27142 

圖像遮蔽：

https://www.innofied.com/implementing-image-masking-in-ios/

我是盡我best..to提供solution..that是簡單的圖像

是面具形象是GIF類型的圖像

代碼寫

override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 
     let image = UIImage(named: "image.gif") 
     let maskingImage = UIImage(named: "mask-image.gif") 
     imageView.image = maskImage(image: image!, mask: maskingImage!) 
    } 

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 
} 

最終結果