iOS图像模糊效果与类别
我正在尝试使用类别添加模糊效果iOS图像模糊效果与类别,ios,objective-c-category,uiblureffect,Ios,Objective C Category,Uiblureffect,我正在尝试使用类别添加模糊效果 + (UIImage *)blurImageWithImage:(UIImage*) imageName withView:(UIView*)view { UIImage *sourceImage = imageName; CIImage *inputImage = [CIImage imageWithCGImage:sourceImage.CGImage]; // Apply Affine-Clamp filter to stretch the image s
+ (UIImage *)blurImageWithImage:(UIImage*) imageName withView:(UIView*)view {
UIImage *sourceImage = imageName;
CIImage *inputImage = [CIImage imageWithCGImage:sourceImage.CGImage];
// Apply Affine-Clamp filter to stretch the image so that it does not
// look shrunken when gaussian blur is applied
CGAffineTransform transform = CGAffineTransformIdentity;
CIFilter *clampFilter = [CIFilter filterWithName:@"CIAffineClamp"];
[clampFilter setValue:inputImage forKey:@"inputImage"];
[clampFilter setValue:[NSValue valueWithBytes:&transform objCType:@encode(CGAffineTransform)] forKey:@"inputTransform"];
// Apply gaussian blur filter with radius of 30
CIFilter *gaussianBlurFilter = [CIFilter filterWithName: @"CIGaussianBlur"];
[gaussianBlurFilter setValue:clampFilter.outputImage forKey: @"inputImage"];
[gaussianBlurFilter setValue:@10 forKey:@"inputRadius"];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [context createCGImage:gaussianBlurFilter.outputImage fromRect:[inputImage extent]];
// Set up output context.
UIGraphicsBeginImageContext(view.frame.size);
CGContextRef outputContext = UIGraphicsGetCurrentContext();
// Invert image coordinates
CGContextScaleCTM(outputContext, 1.0, -1.0);
CGContextTranslateCTM(outputContext, 0, view.frame.size.height);
// Draw base image.
CGContextDrawImage(outputContext, view.frame, cgImage);
// Apply white tint
CGContextSaveGState(outputContext);
CGContextSetFillColorWithColor(outputContext, [UIColor colorWithWhite:1 alpha:0.2].CGColor);
CGContextFillRect(outputContext, view.frame);
CGContextRestoreGState(outputContext);
// Output image is ready.
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return outputImage; }
然后我在UIView中调用此函数,如下所示:
UIImage *image = [UIImage imageNamed:@"xxx"]
UIImageView *page = [[UIImageView alloc] initWithImage:[UIImage blurImageWithImage:image withView:self]];
如果我直接在类中添加此函数,它会工作,但如果我在UIImage类别中添加,则不会工作。我之前也遇到过同样的问题。但非常感谢我得到了解决方案
+ (UIImage *)blurImageWithImage:(UIImage*) imageName withView:(UIView*)view {
UIImage *sourceImage = imageName;
CIImage *inputImage = [CIImage imageWithCGImage:sourceImage.CGImage];
// Apply Affine-Clamp filter to stretch the image so that it does not
// look shrunken when gaussian blur is applied
CGAffineTransform transform = CGAffineTransformIdentity;
CIFilter *clampFilter = [CIFilter filterWithName:@"CIAffineClamp"];
[clampFilter setValue:inputImage forKey:@"inputImage"];
[clampFilter setValue:[NSValue valueWithBytes:&transform objCType:@encode(CGAffineTransform)] forKey:@"inputTransform"];
// Apply gaussian blur filter with radius of 30
CIFilter *gaussianBlurFilter = [CIFilter filterWithName: @"CIGaussianBlur"];
[gaussianBlurFilter setValue:clampFilter.outputImage forKey: @"inputImage"];
[gaussianBlurFilter setValue:@10 forKey:@"inputRadius"];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [context createCGImage:gaussianBlurFilter.outputImage fromRect:[inputImage extent]];
// Set up output context.
UIGraphicsBeginImageContext(view.frame.size);
CGContextRef outputContext = UIGraphicsGetCurrentContext();
// Invert image coordinates
CGContextScaleCTM(outputContext, 1.0, -1.0);
CGContextTranslateCTM(outputContext, 0, view.frame.size.height);
// Draw base image.
CGContextDrawImage(outputContext, view.frame, cgImage);
// Apply white tint
CGContextSaveGState(outputContext);
CGContextSetFillColorWithColor(outputContext, [UIColor colorWithWhite:1 alpha:0.2].CGColor);
CGContextFillRect(outputContext, view.frame);
CGContextRestoreGState(outputContext);
// Output image is ready.
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return outputImage; }
请按照步骤操作。确保模糊图像功能正常工作。
1) 在类别中,添加实例方法而不是类方法。
前
2) 在VC中导入类别
3) 使用类别,例如
UIImage *image = [UIImage imageNamed:@"xxx"]
UIImageView *page = [[UIImageView alloc] initWithImage:[image blurImageWithImage:image withView:self]];
让我知道这个解决方案对您很有效。原来问题是我在进行上下文翻译时忘记添加“-”。 所以我最终要做的是创建一个类方法 接口:
+ (UIImage *)blurImageWithImageName:(NSString*) imageName withView:(UIView*)view;
实施:
+ (UIImage *)blurImageWithImageName:(NSString*) imageName withView:(UIView*)view {
UIImage *sourceImage = [UIImage imageNamed:imageName];
CIImage *inputImage = [CIImage imageWithCGImage:sourceImage.CGImage];
// Apply Affine-Clamp filter to stretch the image so that it does not
// look shrunken when gaussian blur is applied
CGAffineTransform transform = CGAffineTransformIdentity;
CIFilter *clampFilter = [CIFilter filterWithName:@"CIAffineClamp"];
[clampFilter setValue:inputImage forKey:@"inputImage"];
[clampFilter setValue:[NSValue valueWithBytes:&transform objCType:@encode(CGAffineTransform)] forKey:@"inputTransform"];
// Apply gaussian blur filter with radius of 30
CIFilter *gaussianBlurFilter = [CIFilter filterWithName: @"CIGaussianBlur"];
[gaussianBlurFilter setValue:clampFilter.outputImage forKey: @"inputImage"];
[gaussianBlurFilter setValue:@10 forKey:@"inputRadius"];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [context createCGImage:gaussianBlurFilter.outputImage fromRect:[inputImage extent]];
// Set up output context.
UIGraphicsBeginImageContext(view.frame.size);
CGContextRef outputContext = UIGraphicsGetCurrentContext();
// Invert image coordinates
CGContextScaleCTM(outputContext, 1.0, -1.0);
CGContextTranslateCTM(outputContext, 0, -view.frame.size.height);
// Draw base image.
CGContextDrawImage(outputContext, view.frame, cgImage);
// Apply white tint
CGContextSaveGState(outputContext);
CGContextSetFillColorWithColor(outputContext, [UIColor colorWithWhite:1 alpha:0.2].CGColor);
CGContextFillRect(outputContext, view.frame);
CGContextRestoreGState(outputContext);
// Output image is ready.
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return outputImage;
}
这是可行的,但显然我还有另一个问题。无论如何谢谢你!