模糊图像的特定部分（矩形，圆形）？
我想模糊矩形或圆形的图像。 谷歌search后，我发现很容易模糊整个图像，但很难模糊图像的特定部分（矩形，圆形）。 所以怎么可能？
提前致谢
只需将您的UIImageView属性名称设置为“imageView”，并在您的实现文件中添加以下四个具有相同序列的方法。 另外，将您的ImageView模式设置为“重绘”。 为给定的模糊效果添加UIImage类别或使用任何自定义类，它将为您工作。
方法1 – 裁剪图像
#pragma mark - Cropping the Image - (UIImage *)croppIngimageByImageName:(UIImage *)imageToCrop toRect:(CGRect)rect{ CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], rect); UIImage *cropped = [UIImage imageWithCGImage:imageRef]; CGImageRelease(imageRef); return cropped; }
方法2 – 合并两个图像
#pragma mark - Marge two Images - (UIImage *) addImageToImage:(UIImage *)img withImage2:(UIImage *)img2 andRect:(CGRect)cropRect{ CGSize size = CGSizeMake(imageView.image.size.width, imageView.image.size.height); UIGraphicsBeginImageContext(size); CGPoint pointImg1 = CGPointMake(0,0); [img drawAtPoint:pointImg1]; CGPoint pointImg2 = cropRect.origin; [img2 drawAtPoint: pointImg2]; UIImage* result = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return result; }
方法3 – RoundRect图像
#pragma mark - RoundRect the Image - (UIImage *)roundedRectImageFromImage:(UIImage *)image withRadious:(CGFloat)radious { if(radious == 0.0f) return image; if( image != nil) { CGFloat imageWidth = image.size.width; CGFloat imageHeight = image.size.height; CGRect rect = CGRectMake(0.0f, 0.0f, imageWidth, imageHeight); UIWindow *window = [[[UIApplication sharedApplication] windows] objectAtIndex:0]; const CGFloat scale = window.screen.scale; UIGraphicsBeginImageContextWithOptions(rect.size, NO, scale); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextBeginPath(context); CGContextSaveGState(context); CGContextTranslateCTM (context, CGRectGetMinX(rect), CGRectGetMinY(rect)); CGContextScaleCTM (context, radious, radious); CGFloat rectWidth = CGRectGetWidth (rect)/radious; CGFloat rectHeight = CGRectGetHeight (rect)/radious; CGContextMoveToPoint(context, rectWidth, rectHeight/2.0f); CGContextAddArcToPoint(context, rectWidth, rectHeight, rectWidth/2.0f, rectHeight, radious); CGContextAddArcToPoint(context, 0.0f, rectHeight, 0.0f, rectHeight/2.0f, radious); CGContextAddArcToPoint(context, 0.0f, 0.0f, rectWidth/2.0f, 0.0f, radious); CGContextAddArcToPoint(context, rectWidth, 0.0f, rectWidth, rectHeight/2.0f, radious); CGContextRestoreGState(context); CGContextClosePath(context); CGContextClip(context); [image drawInRect:CGRectMake(0.0f, 0.0f, imageWidth, imageHeight)]; UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return newImage; } return nil; }
方法4 – 触摸移动
#pragma mark - Touch Methods - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UIImage *croppedImg = nil; UITouch *touch = [touches anyObject]; CGPoint currentPoint = [touch locationInView:self.imageView]; double ratioW=imageView.image.size.width/imageView.frame.size.width ; double ratioH=imageView.image.size.height/imageView.frame.size.height; currentPoint.x *= ratioW; currentPoint.y *= ratioH; double circleSizeW = 30 * ratioW; double circleSizeH = 30 * ratioH; currentPoint.x = (currentPoint.x - circleSizeW/2<0)? 0 : currentPoint.x - circleSizeW/2; currentPoint.y = (currentPoint.y - circleSizeH/2<0)? 0 : currentPoint.y - circleSizeH/2; CGRect cropRect = CGRectMake(currentPoint.x , currentPoint.y, circleSizeW, circleSizeH); NSLog(@"x %0.0f, y %0.0f, width %0.0f, height %0.0f", cropRect.origin.x, cropRect.origin.y, cropRect.size.width, cropRect.size.height ); croppedImg = [self croppIngimageByImageName:self.imageView.image toRect:cropRect]; // Blur Effect croppedImg = [croppedImg imageWithGaussianBlur9]; // Contrast Effect // croppedImg = [croppedImg imageWithContrast:50]; croppedImg = [self roundedRectImageFromImage:croppedImg withRadious:4]; imageView.image = [self addImageToImage:imageView.image withImage2:croppedImg andRect:cropRect]; }
UIImage类别类
的UIImage + ImageBlur.h
#import <UIKit/UIKit.h> @interface UIImage (ImageBlur) - (UIImage *)imageWithGaussianBlur9; @end
的UIImage + ImageBlur.m
#import "UIImage+ImageBlur.h" @implementation UIImage (ImageBlur) - (UIImage *)imageWithGaussianBlur9 { float weight[5] = {0.1270270270, 0.1945945946, 0.1216216216, 0.0540540541, 0.0162162162}; // Blur horizontally UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale); [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height) blendMode:kCGBlendModeNormal alpha:weight[0]]; for (int x = 1; x < 5; ++x) { [self drawInRect:CGRectMake(x, 0, self.size.width, self.size.height) blendMode:kCGBlendModeNormal alpha:weight[x]]; [self drawInRect:CGRectMake(-x, 0, self.size.width, self.size.height) blendMode:kCGBlendModeNormal alpha:weight[x]]; } UIImage *horizBlurredImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); // Blur vertically UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale); [horizBlurredImage drawInRect:CGRectMake(0, 0, self.size.width, self.size.height) blendMode:kCGBlendModeNormal alpha:weight[0]]; for (int y = 1; y < 5; ++y) { [horizBlurredImage drawInRect:CGRectMake(0, y, self.size.width, self.size.height) blendMode:kCGBlendModeNormal alpha:weight[y]]; [horizBlurredImage drawInRect:CGRectMake(0, -y, self.size.width, self.size.height) blendMode:kCGBlendModeNormal alpha:weight[y]]; } UIImage *blurredImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); // return blurredImage; } @end
快乐编码….
在视图或图像视图中添加以下Pangesture
UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(imageTaped:)]; [panGesture setMaximumNumberOfTouches:1]; [self.view addGestureRecognizer:panGesture];
模糊图像的方法
- (void)imageTaped:(UIPanGestureRecognizer *)gestureRecognizer { CIContext *context = [CIContext contextWithOptions:nil]; CGPoint touchLocation = [gestureRecognizer locationInView:self.imgviewMain]; CGRect temp=CGRectMake(touchLocation.x-25, ((self.imgviewMain.frame.size.height-50) - touchLocation.y)+25, 50, 50); CIImage *inputImage0 = [[CIImage alloc] initWithImage:self.imgviewMain.image]; CIImage *inputImage = [[CIImage alloc] initWithImage:[UIImage imageWithCGImage:[context createCGImage:inputImage0 fromRect:temp]]]; CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"]; [blurFilter setDefaults]; [blurFilter setValue: inputImage forKey: @"inputImage"]; [blurFilter setValue: [NSNumber numberWithFloat:0.1] forKey:@"inputRadius"]; CIImage *outputImage = [blurFilter valueForKey: @"outputImage"]; UIImageView *imgtest=[[UIImageView alloc]init]; imgtest.image=[UIImage imageWithCGImage:[context createCGImage:outputImage fromRect:outputImage.extent]]; UIImage *image; UIImage *bottomImage = self.imgviewMain.image; image = imgtest.image; CGSize newSize = CGSizeMake(self.imgviewMain.frame.size.width, self.imgviewMain.frame.size.height); UIGraphicsBeginImageContext( newSize ); [bottomImage drawInRect:CGRectMake(0,0,768,1024)]; CGRect newRect2=CGRectMake(temp.origin.x,((self.imgviewMain.frame.size.height-50) - temp.origin.y), image.size.width, image.size.height); image=[self makeRoundedImage:image radius:10]; [image drawInRect:newRect2 blendMode:kCGBlendModeNormal alpha:0.5]; UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); self.imgviewMain.image=newImage; }
RoundedImage方法
-(UIImage *)makeRoundedImage:(UIImage *) image radius: (float) radius; { CALayer *imageLayer = [CALayer layer]; imageLayer.frame = CGRectMake(0, 0, image.size.width, image.size.height); imageLayer.contents = (id) image.CGImage; imageLayer.masksToBounds = YES; imageLayer.cornerRadius = radius; UIGraphicsBeginImageContext(image.size); [imageLayer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *roundedImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return roundedImage; }
我知道我晚了一点，但可能会帮助别人努力工作。
我最近需要实现它，我无法find关于这个特定的主题（特别是如何处理不同的UIImageView的规模types，如规模填充，中心等如何得到这个工作）在互联网上的信息。 所以我开发了一个小项目，完全符合你的期望。
