高斯模糊滤镜逆转：iOS

发布时间：2020-12-14 19:23:23 所属栏目：百科来源：网络整理

导读：我有一个高斯模糊,我正在为一个应用程序做. //Get a UIImage from the UIView UIGraphicsBeginImageContext(self.view.bounds.size); [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurren

我有一个高斯模糊,我正在为一个应用程序做.

//Get a UIImage from the UIView
    UIGraphicsBeginImageContext(self.view.bounds.size);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //Blur the UIImage
    CIImage *imageToBlur = [CIImage imageWithCGImage:viewImage.CGImage];
    CIFilter *gaussianBlurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
    [gaussianBlurFilter setValue:imageToBlur forKey:@"inputImage"];
    [gaussianBlurFilter setValue:[NSNumber numberWithFloat:2] forKey:@"inputRadius"];
    CIImage *resultImage = [gaussianBlurFilter valueForKey:@"outputImage"];
    UIImage *endImage = [[UIImage alloc] initWithCIImage:resultImage];

    //Place the UIImage in a UIImageView
    newView = [[UIImageView alloc] initWithFrame:self.view.bounds];
    newView.image = endImage;
    [self.view addSubview:newView];

它工作得很好,但我希望能够将其反转并使视图恢复正常.

我怎么能这样做,因为试图简单地从它的超视图中移除模糊的视图不起作用.我也尝试过将各种属性设置为零而没有运气.

解决方法

在属性中保留指向viewImage的指针

@property (nonatomic,strong) UIImage* originalImage;

然后

UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

加

self.originalImage = viewImage;

要还原您的图像：

newView.image = self.originalImage;

当你应用模糊时它不会改变viewImage ..你创建了一个单独的CIImage,它变得模糊,你从模糊的CIImage中创建一个新的UIImage.

（编辑：李大同）

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