objective-c - 一个过滤器正在重置另一个。不能同时申请

Question

我在一张图片上使用了 2 个滤镜。问题很容易理解，如果我移动一个滑块，过滤器将正常应用，但当我移动另一个滑块时，图片将重置为原始_tempImage. 我尝试过替换 _justNowImage.image = quickFilteredImage;，_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过滤器..即 _tempImage

将这些行添加到两种方法的末尾

_tempImage = quickFilteredImage