Getting error [UIImage extent]: unrecognized selector sent to instance - ios

Question

I'm trying to apply a radial blur to my UIImageView but when I try this I get the error
[UIImage extent]: unrecognized selector sent to instance
The code I'm using is from the example on:
https://developer.apple.com/documentation/coreimage/selectively_focusing_on_an_image
let h = bgImage.image!.size.height
let w = bgImage.image!.size.width
guard let radialMask = CIFilter(name:"CIRadialGradient") else {
return
}
let imageCenter = CIVector(x:0.55 * w, y:0.6 * h)
radialMask.setValue(imageCenter, forKey:kCIInputCenterKey)
radialMask.setValue(0.2 * h, forKey:"inputRadius0")
radialMask.setValue(0.3 * h, forKey:"inputRadius1")
radialMask.setValue(CIColor(red:0, green:1, blue:0, alpha:0),
forKey:"inputColor0")
radialMask.setValue(CIColor(red:0, green:1, blue:0, alpha:1),
forKey:"inputColor1")
guard let maskedVariableBlur = CIFilter(name:"CIMaskedVariableBlur") else {
return
}
maskedVariableBlur.setValue(bgImage.image, forKey: kCIInputImageKey)
maskedVariableBlur.setValue(10, forKey: kCIInputRadiusKey)
maskedVariableBlur.setValue(radialMask.outputImage, forKey: "inputMask")
let selectivelyFocusedCIImage = maskedVariableBlur.outputImage/
In which bgImage is a UIImageView
What am I doing wrong here?

Answer 1

You need
guard let image = maskedVariableBlur?.image, cgimg = image.CGImage else {
print("imageView doesn't have an image!")
return
}
as
let coreImage = CIImage(CGImage:cgimg)
maskedVariableBlur.setValue(coreImage, forKey: kCIInputImageKey)
expects a CIImage not a UIImage

Answer 2

I see two issues
- One is your explicitly unwrapping the optional.
let h = bgImage.image!.size.height
let w = bgImage.image!.size.width
Please use guard here to avoid unexpected crashes
Second issue is bgImage.image!.size.height. Here you should be using bgImage.image.CIImage.size or something like #image.CIImage.size.
Please refer below similar post. I hope this should help
Unrecognized selector sent to UIImage?