objective-c - 一个过滤器正在重置另一个过滤器。不能同时应用它们

Question

我在一张图像上使用了 2 个滤镜。这个问题很容易理解，如果我移动一个 slider ，滤镜将正常应用，但当我移动另一个 slider 时，图片将重置为原始 _tempImage。 我尝试将 _justNowImage.image = QuickFilteredImage; 替换为 _tempImage = QuickFilteredImage;，但结果是过滤器变得疯狂。

谢谢

   - (IBAction)sharpenSliderChanged:(id)sender
    {   
        GPUImageSharpenFilter *sharpenFilter = [[GPUImageSharpenFilter alloc] init];
        [sharpenFilter setSharpness:sharpenSlider.value];
        UIImage *quickFilteredImage = [sharpenFilter imageByFilteringImage: _tempImage];
        _justNowImage.image = quickFilteredImage;
    }

    - (IBAction)exposureSliderChanged:(id)sender
    {
        GPUImageExposureFilter *exposureFilter = [[GPUImageExposureFilter alloc] init];
        [exposureFilter setExposure:exposureSlider.value];
        UIImage *quickFilteredImage = [exposureFilter imageByFilteringImage: _tempImage];
        _justNowImage.image = quickFilteredImage;
    }

Answer 1

    UIImage *quickFilteredImage = [exposureFilter imageByFilteringImage: _tempImage];

您仅对原始图像应用不同的滤镜......即 _tempImage

将这些行添加到两个方法的末尾

_tempImage = quickFilteredImage