不确定如何使用CICrop

时间:2015-08-11 15:34:11

标签: ios swift filter camera crop

我尝试使用CICrop裁剪图像,但是当我尝试裁剪时,它会因此错误消息而崩溃:

  

因未捕获的异常终止应用' NSUnknownKeyException',   原因:' [setValue:forUndefinedKey:]:这个类   密钥不符合密钥值编码   CIAttributeTypeRectangle'   ***第一次抛出调用堆栈:(0x1847fc2d8 0x1964c80e4 0x1847fbf5c 0x184e34a4c 0x185635480 0x10005e554 0x10005eb7c 0x1892a9398   0x189292474 0x1892a8d34 0x1892a89c0 0x1892a1efc 0x189275120   0x1895162b8 0x189273634 0x1847b4240 0x1847b34e4 0x1847b1594   0x1846dd2d4 0x18e1336fc 0x1892daf40 0x10006481c 0x196b72a08)   libc ++ abi.dylib:以未捕获的类型异常终止   NSException

这是我的代码:

@IBAction func CropButton(sender: UIButton)
{
   let CropBoxHeight = CGFloat(200)
   let CropBoxWidth = CGFloat(200)          
   let Rectangle = CIVector(x: view.center.x, y: view.center.y, z: 200, w: 200)
   let filter = CIFilter(name: "CICrop")
   let inputImage = CIImage(image: originalImage)

   let ciContext = CIContext(options: nil)

   filter.setDefaults()
   filter.setValue(inputImage, forKey: kCIInputImageKey)
   filter.setValue(Rectangle, forKey: kCIAttributeTypeRectangle)

   let originalOrientation: UIImageOrientation = imageView.image!.imageOrientation
   let originalScale = imageView.image!.scale

   let cgImage = ciContext.createCGImage(filter.outputImage, fromRect: inputImage.extent())

    imageView.image = UIImage(CGImage: cgImage, scale: originalScale, orientation: originalOrientation)!
}

它崩溃了这一行:         filter.setValue(Rectangle, forKey: kCIAttributeTypeRectangle)

1 个答案:

答案 0 :(得分:5)

您似乎需要使用

filter.setValue(Rectangle, forKey: "inputRectangle")

而不是

filter.setValue(Rectangle, forKey: kCIAttributeTypeRectangle)

这可以在official documentation中找到。但是,我无法找到此密钥的任何内置常量。