Question

我试图使用CGBitmapContextCreate＆amp ;;来缩放图像。 CGContextDrawImage和我遇到了一些我无法理解的错误。

继承我的代码

    let ciImage = CIImage(image: imageView.image)
    let cgImage = convertCIImageToCGImage(ciImage)
    let width = 50
    let height = (width / CGImageGetWidth(cgImage)) * CGImageGetHeight(cgImage)
    let bitsPerComponent = CGImageGetBitsPerComponent(cgImage)
    let bytesPerRow = CGImageGetBytesPerRow(cgImage)
    let colorSpace = CGImageGetColorSpace(cgImage)
    let bitmapInfo = CGImageGetBitmapInfo(cgImage)
    let context = CGBitmapContextCreate(nil, width, height, bitsPerComponent, bytesPerRow, colorSpace, bitmapInfo)


    CGContextSetInterpolationQuality(context, kCGInterpolationHigh)

    CGContextDrawImage(context, CGRect(origin: CGPointZero, size: CGSize(width: CGFloat(width), height: CGFloat(height))), cgImage)


    scaledImage = UIImage(CGImage: CGBitmapContextCreateImage(context)!)!

我即将收到错误

<Error>: CGContextSetInterpolationQuality: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

我知道为什么会出现这个错误？

使用CGBitmapContextCreate＆amp; amp; scalling图像的问题CGContextDrawImage

0 个答案: