以下方法尝试将高斯模糊应用于图像。然而它没有做任何事情。你能告诉我出了什么问题吗?如果你也知道它出错的原因,那也会有所帮助。我正在尝试了解CALayers和quartzcore。
由于
-(void)updateFavoriteRecipeImage{
[self.favoriteRecipeImage setImageWithURL:[NSURL URLWithString:self.profileVCModel.favoriteRecipeImageUrl] placeholderImage:[UIImage imageNamed:@"miNoImage"]];
//Set content mode
[self.favoriteRecipeImage setContentMode:UIViewContentModeScaleAspectFill];
self.favoriteRecipeImage.layer.masksToBounds = YES;
//Blur the image
CALayer *blurLayer = [CALayer layer];
CIFilter *blur = [CIFilter filterWithName:@"CIGaussianBlur"];
[blur setDefaults];
blurLayer.backgroundFilters = [NSArray arrayWithObject:blur];
[self.favoriteRecipeImage.layer addSublayer:blurLayer];
[self.favoriteRecipeImage setAlpha:0];
//Show image using fade
[UIView animateWithDuration:.3 animations:^{
//Load alpha
[self.favoriteRecipeImage setAlpha:1];
[self.favoriteRecipeImageMask setFrame:self.favoriteRecipeImage.frame];
}];
}
答案 0 :(得分:5)
documentation of the backgroundFilters
property说:
特别注意事项
iOS中的图层不支持此属性。
从iOS 6.1开始,没有公共API可以将实时过滤器应用于iOS上的图层。您可以编写代码以将基础图层绘制到CGImage
,然后将滤镜应用于该图像并将其设置为图层的背景,但这样做有点复杂并且不是“实时”(它不会更新如果基础层发生变化,则自动进行。)
答案 1 :(得分:1)
尝试以下内容:
CIImage *inputImage = [[CIImage alloc] initWithImage:[UIImage imageNamed:@"test.png"]] ;
CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"] ;
[blurFilter setDefaults] ;
[blurFilter setValue:inputImage forKey:@"inputImage"] ;
[blurFilter setValue: [NSNumber numberWithFloat:10.0f] forKey:@"inputRadius"];
CIImage *outputImage = [blurFilter valueForKey: @"outputImage"];
CIContext *context = [CIContext contextWithOptions:nil];
self.bluredImageView.image = [UIImage imageWithCGImage:[context createCGImage:outputImage fromRect:outputImage.extent]];