가우시안 블러는 엑스 코드에 감동 지역에서만 필터 Apply (적용)

Question

여기에 전체 만이 필터를 설립 모든 이미지

//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]; 

내가 흐림 이미지의 터치 영역에만 필터 적용됩니다 clases 검색 한

에 대한 가우시안 필터에 불과하다 영상. 이 같은

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ ... } 
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{ ... } 
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{ ... } 

Answer 1

Juste는 작동합니다 :

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    //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]; 
} 

그리고 다른 방법 :