一个过滤器正在重置另一个。不能同时适用它们

Question

我在一张图片上使用了2个滤镜。这个问题很容易理解，如果我移动一个滑块，滤镜将会很好地应用，但是当我移动另一个滑块时，图片将重置为原始_tempImage。 我尝试用_justNowImage.image = quickFilteredImage;替换_tempImage = quickFilteredImage;，但结果是一个疯狂的过滤器。

由于

   - (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];

您只对原始图片应用了不同的过滤器..i.e _tempImage

将这些行添加到两个方法的末尾

_tempImage = quickFilteredImage