[IOS 开发] 为UIImage 绘制 毛玻璃效果

为uiimage 绘制 毛玻璃效果

 

//给Image增加- (UIImage *)applyBlurRadius:(CGFloat)radius toImage:(UIImage *)image{    if (radius < 0)    {       radius = 0;    }        CIContext *context = [CIContext contextWithOptions:nil];        CIImage *inputImage = [CIImage imageWithCGImage:image.CGImage];        // Setting up gaussian blur    CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];        [filter setValue:inputImage forKey:kCIInputImageKey];         [filter setValue:[NSNumber numberWithFloat:radius] forKey:@"inputRadius"];        CIImage *result = [filter valueForKey:kCIOutputImageKey];        CGImageRef cgImage = [context createCGImage:result fromRect:[inputImage extent]];        UIImage *returnImage = [UIImage imageWithCGImage:cgImage];        CGImageRelease(cgImage);        return returnImage;}//把view转换成Image-(UIImage *)convertViewToImage{    UIGraphicsBeginImageContext(self.bounds.size);    [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();        return image;}