相关疑难解决方法(0)

我有一个UIImage是UIImageOrientationUp(纵向),我想通过90度逆时针旋转(景观).我不想用CGAffineTransform.我想要UIImage实际转移位置的像素.我正在使用一段代码(如下所示),最初是为了调整大小UIImage来执行此操作.我将目标大小设置为当前大小UIImage但是我得到一个错误:

(错误):CGBitmapContextCreate:无效数据字节/行:对于8个整数位/组件,3个组件,kCGImageAlphaPremultipliedLast,应该至少为1708.

(每当我提供SMALLER尺寸作为目标尺寸BTW时,我都不会收到错误).如何UIImage在保留当前尺寸的同时仅使用核心图形功能旋转我的90度CCW？

-(UIImage*)reverseImageByScalingToSize:(CGSize)targetSize:(UIImage*)anImage
{
    UIImage* sourceImage = anImage; 
    CGFloat targetWidth = targetSize.height;
    CGFloat targetHeight = targetSize.width;

    CGImageRef imageRef = [sourceImage CGImage];
    CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
    CGColorSpaceRef colorSpaceInfo = CGImageGetColorSpace(imageRef);

    if (bitmapInfo == kCGImageAlphaNone) {
        bitmapInfo = kCGImageAlphaNoneSkipLast;
    }

    CGContextRef bitmap;

    if (sourceImage.imageOrientation == UIImageOrientationUp || sourceImage.imageOrientation == UIImageOrientationDown) {
        bitmap = CGBitmapContextCreate(NULL, targetHeight, targetWidth, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo);

    } else {


        bitmap = CGBitmapContextCreate(NULL, targetWidth, …

该函数应该获取图像并将其转换为数据，然后将数据转换回图像。当我使用图像库中的图像或以横向模式拍摄照片时，效果很好。但是，当我以肖像模式拍摄照片时，图像在转换回图像时将会旋转和拉伸。有什么办法可以防止这种情况发生吗？

func pixelCalculator (){
    let image = originalImage

    let height = Int((image.size.height))
    print(height)
    let width = Int((image.size.width))

    let bitsPerComponent = Int(8)
    let bytesPerRow = 4 * width
    let colorSpace = CGColorSpaceCreateDeviceRGB()
    let rawData = UnsafeMutablePointer<RGBAPixel>.allocate(capacity: (width * height))
    let bitmapInfo: UInt32 = CGBitmapInfo.byteOrder32Big.rawValue | CGImageAlphaInfo.premultipliedLast.rawValue
    let CGPointZero = CGPoint(x: 0, y: 0)
    let rect = CGRect(origin: CGPointZero, size: (image.size))



    let imageContext = CGContext(data: rawData, width: width, height: height, bitsPerComponent: bitsPerComponent, bytesPerRow: bytesPerRow, space: colorSpace, bitmapInfo: bitmapInfo)

    imageContext?.draw(image.cgImage!, in: rect)

    let …