UI效果

模糊效果

- (UIImage *)takeSnapshotOfView:(UIView *)view
{
CGFloat reductionFactor = 1;
UIGraphicsBeginImageContext(CGSizeMake(view.frame.size.width/reductionFactor, view.frame.size.height/reductionFactor));
[view drawViewHierarchyInRect:CGRectMake(0, 0, view.frame.size.width/reductionFactor, view.frame.size.height/reductionFactor) afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return image;
}

- (UIImage *)blurWithCoreImage:(UIImage *)sourceImage
{
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:@30 forKey:@"inputRadius"];

CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [context createCGImage:gaussianBlurFilter.outputImage fromRect:[inputImage extent]];

// Set up output context.
UIGraphicsBeginImageContext(self.view.frame.size);
CGContextRef outputContext = UIGraphicsGetCurrentContext();
CGContextScaleCTM(outputContext, 1.0, -1.0);
CGContextTranslateCTM(outputContext, 0, -self.view.frame.size.height);

// Draw base image.
CGContextDrawImage(outputContext, self.view.frame, cgImage);

// Apply white tint
CGContextSaveGState(outputContext);
CGContextSetFillColorWithColor(outputContext, [UIColor colorWithWhite:1 alpha:0.2].CGColor);
CGContextFillRect(outputContext, self.view.frame);
CGContextRestoreGState(outputContext);

// Output image is ready.
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return outputImage;
}

- (UIImage *)blurWithGPUImage:(UIImage *)sourceImage
{
GPUImageGaussianBlurFilter *blurFilter = [[GPUImageGaussianBlurFilter alloc] init];
blurFilter.blurRadiusInPixels = 30.0;

//    GPUImageBoxBlurFilter *blurFilter = [[GPUImageBoxBlurFilter alloc] init];
//    blurFilter.blurRadiusInPixels = 20.0;

//    GPUImageiOSBlurFilter *blurFilter = [[GPUImageiOSBlurFilter alloc] init];
//    blurFilter.saturation = 1.5;
//    blurFilter.blurRadiusInPixels = 30.0;

return [blurFilter imageByFilteringImage: sourceImage];
}

UIImage+ImageEffect

- (UIImage *)blurWithImageEffects:(UIImage *)image
{
return [image applyBlurWithRadius:30 tintColor:[UIColor colorWithWhite:1 alpha:0.2] saturationDeltaFactor:1.5 maskImage:nil];
}