我正在尝试将UIImageView
的图像属性设置为我使用CoreImage
模糊的图像。该代码与未经过滤的图像完美配合,但是当我将背景图像设置为过滤后的图像时,contentMode
似乎停止为UIImageView
工作 - 而不是填充方面,图像会垂直拉伸。除了在代码中设置contentMode
之外,我还在故事板上设置它,但结果是一样的。
我正在使用Swift 2 / Xcode 7。
func updateBackgroundImage(image: UIImage) {
backgroundImage.contentMode = .ScaleAspectFill
backgroundImage.layer.masksToBounds = true
backgroundImage.image = blurImage(image)
}
func blurImage(image: UIImage) -> UIImage {
let imageToBlur = CIImage(image: image)!
let blurfilter = CIFilter(name: "CIGaussianBlur")!
blurfilter.setValue(10, forKey: kCIInputRadiusKey)
blurfilter.setValue(imageToBlur, forKey: "inputImage")
let resultImage = blurfilter.valueForKey("outputImage") as! CIImage
let croppedImage: CIImage = resultImage.imageByCroppingToRect(CGRectMake(0, 0, imageToBlur.extent.size.width, imageToBlur.extent.size.height))
let blurredImage = UIImage(CIImage: croppedImage)
return blurredImage
}
为什么使用CIImage
进行过滤导致我的图片忽略contentMode
,如何解决此问题?
答案 0 :(得分:6)
解决方案是替换你的行:
let blurredImage = UIImage(CIImage: croppedImage)
这两行:
let context = CIContext(options: nil)
let blurredImage = UIImage (CGImage: context.createCGImage(croppedImage, fromRect: croppedImage.extent))
所以你的完整blurImage函数看起来像这样:
func blurImage(image: UIImage) -> UIImage {
let imageToBlur = CIImage(image: image)!
let blurfilter = CIFilter(name: "CIGaussianBlur")!
blurfilter.setValue(10, forKey: kCIInputRadiusKey)
blurfilter.setValue(imageToBlur, forKey: "inputImage")
let resultImage = blurfilter.valueForKey("outputImage") as! CIImage
let croppedImage: CIImage = resultImage.imageByCroppingToRect(CGRectMake(0, 0, imageToBlur.extent.size.width, imageToBlur.extent.size.height))
let context = CIContext(options: nil)
let blurredImage = UIImage (CGImage: context.createCGImage(croppedImage, fromRect: croppedImage.extent))
return blurredImage
}