Question

我正在尝试根据用户在选择器上选择的值调整图像大小。

为此目的，我目前使用以下代码：

- (UIImage *)scaleImage:(UIImage *)image toSize:(CGSize)targetSize {  

    CGRect frame;
    UIImage * newImage;
    newImage = image;

        frame = frontImageView.frame;
        frame.size.width = targetSize.width;
        frame.size.height = targetSize.height;
        frontImageView.frame = frame;



    // the pixels will be painted to this array




    CGImageRef imageRef = [newImage CGImage]; (APP crash at this point)
    CGFloat height = targetSize.height;
    CGFloat Width = targetSize.width;
    CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);


    pixels = (uint32_t *) malloc(targetSize.width * targetSize.height * sizeof(uint32_t));

    // clear the pixels so any transparency is preserved
    memset(pixels, 0, Width * height * sizeof(uint32_t));

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();


    alphaInfo = kCGImageAlphaNoneSkipLast;

    CGContextRef bitmap =  CGBitmapContextCreate(pixels, Width, height, 8, Width * sizeof(uint32_t), colorSpace, 
                                                          kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedLast);

    CGContextDrawImage(bitmap, CGRectMake(0, 0, Width, height), imageRef);
    CGImageRef ref = CGBitmapContextCreateImage(bitmap);

    UIImage *result = [UIImage imageWithCGImage:ref];

    CGContextRelease(bitmap);
    CGImageRelease(ref);
    CGImageRelease(newImage);
    return result;  






}

如果我调整图像大小，第一次（例如25％）没有崩溃。但之后，错误“exec_BAD_Access”发生崩溃。我该如何解决这个问题？

如何解决错误“EXC_BAD_ACCESS”

0 个答案: