UIImageView contentMode在模糊效果应用程序后无法正常工作

Question

我正在尝试将a的图像属性设置为UIImageView我正在模糊的图像CoreImage.代码与未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似乎停止工作UIImageView- 而不是填充方面,图像将垂直拉伸.除了设置contentMode代码,我还在故事板上设置它,但结果是相同的.

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
}

为什么过滤CIImage导致我的图像被忽略contentMode,我该如何解决这个问题？

Answer 1

解决方案是更换您的线路:

let blurredImage = UIImage(CIImage: croppedImage)

有这两行:

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
}