iOS 开发_UIImage毛玻璃效果（真正的毛玻璃~~）

【作者前言】：13年入圈，分享些本人工作中遇到的点点滴滴那些事儿，17年刚开始写博客，高手勿喷！以分享交流为主，欢迎各路豪杰点评改进！

1.应用场景：

Paste_Image.png

2.实现目标：

通过对图片的处理，实现毛玻璃效果，这里因为有些时候模糊程度是因具体需求变化的，所以把方法写活了，方便大家的调用。

3.代码说明：

方式一，推荐使用，效果比较好！Swift版本已更新！

#pragma mark -
#pragma mark - yp_blurryImage: withBlurLevel: 传入图片返回设置毛玻璃效果后的图片
/** Attention points:
① 需要引入#import <Accelerate/Accelerate.h>  
② 传入变量 blur 代表毛玻璃设置的程度，值越大越模糊 范围须在0-1中间,默认为0.5
*/
- (UIImage *)yp_blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur {
    if (blur < 0.f || blur > 1.f) {
        blur = 0.5f;
    }
    int boxSize = (int)(blur * 40);
    boxSize = boxSize - (boxSize % 2) + 1;
    CGImageRef img = image.CGImage;
    vImage_Buffer inBuffer, outBuffer;
    vImage_Error error;
    void *pixelBuffer;
    CGDataProviderRef inProvider = CGImageGetDataProvider(img);
    CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);
    inBuffer.width = CGImageGetWidth(img);
    inBuffer.height = CGImageGetHeight(img);
    inBuffer.rowBytes = CGImageGetBytesPerRow(img);
    inBuffer.data = (void*)CFDataGetBytePtr(inBitmapData);
    pixelBuffer = malloc(CGImageGetBytesPerRow(img) *
                         CGImageGetHeight(img));
    if(pixelBuffer == NULL)
        NSLog(@"No pixelbuffer");
    outBuffer.data = pixelBuffer;
    outBuffer.width = CGImageGetWidth(img);
    outBuffer.height = CGImageGetHeight(img);
    outBuffer.rowBytes = CGImageGetBytesPerRow(img);
    error = vImageBoxConvolve_ARGB8888(&inBuffer,
                                       &outBuffer,
                                       NULL,
                                       0,
                                       0,
                                       boxSize,
                                       boxSize,
                                       NULL,
                                       kvImageEdgeExtend);
    if (error) {
        NSLog(@"error from convolution %ld", error);
    }
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef ctx = CGBitmapContextCreate(
                                             outBuffer.data,
                                             outBuffer.width,
                                             outBuffer.height,
                                             8,
                                             outBuffer.rowBytes,
                                             colorSpace,
                                             kCGImageAlphaNoneSkipLast);
    CGImageRef imageRef = CGBitmapContextCreateImage (ctx);
    UIImage *returnImage = [UIImage imageWithCGImage:imageRef];
    //clean up
    CGContextRelease(ctx);
    CGColorSpaceRelease(colorSpace);
    free(pixelBuffer);
    CFRelease(inBitmapData);
    CGColorSpaceRelease(colorSpace);
    CGImageRelease(imageRef);
    return returnImage;
}

//使用时直接调用即可
UIImage * image = [UIImage imageNamed:@"wukong"];
self.blurryImageView.image = [self yp_blurryImage:image withBlurLevel:0.1];

方式二，代码简洁，效果欠佳

//创建毛玻璃
UIBlurEffect * blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
UIVisualEffectView * effe = [[UIVisualEffectView alloc] initWithEffect:blur];
//毛玻璃大小与所需要添加毛玻璃效果的大小一致
effe.frame = CGRectMake(0,0,self.blurryImageView.frame.size.width - 100,self.blurryImageView.frame.size.width - 100);
effe.layer.masksToBounds = YES;
effe.layer.cornerRadius = 5;
//透明度为1时，毛玻璃程度为最明显
effe.alpha = 0.5;
//把要添加的视图加到毛玻璃上
[self.blurryImageView addSubview:effe];

两种方法均设置为0.5时的效果如下图

Paste_Image.png

💕有的朋友需要方法一的swift版本，抽空翻译了一版，支持最新Swift4语法

注意：需要导入 Accelerate，即： #import Accelerate

func yp_burryImage(image:UIImage, blur:CGFloat) -> UIImage {
        let blur = (blur < 0.0 || blur > 1.0) ? 0.5 : blur;
        var boxSize = Int(blur * 40)
        boxSize = boxSize - (boxSize % 2) + 1
        let cgImg = image.cgImage
        var inBuffer = vImage_Buffer()
        var outBuffer = vImage_Buffer()
        var pixelBuffer: UnsafeMutableRawPointer
        let inProvider = cgImg?.dataProvider
        let inBitmapData = inProvider?.data
        inBuffer.width = vImagePixelCount((cgImg?.width)!)
        inBuffer.height = vImagePixelCount((cgImg?.height)!)
        inBuffer.rowBytes = (cgImg?.bytesPerRow)!
        inBuffer.data = UnsafeMutableRawPointer(mutating: CFDataGetBytePtr(inBitmapData))
        //手动申请内存---
        pixelBuffer = malloc((cgImg?.bytesPerRow)! * (cgImg?.height)!)
        outBuffer.data = pixelBuffer
        outBuffer.width = vImagePixelCount((cgImg?.width)!)
        outBuffer.height = vImagePixelCount((cgImg?.height)!)
        outBuffer.rowBytes = (cgImg?.bytesPerRow)!
        var error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, nil, vImagePixelCount(0), vImagePixelCount(0), UInt32(boxSize), UInt32(boxSize), nil, vImage_Flags(kvImageEdgeExtend))
        
        if error != kvImageNoError {
            error = vImageBoxConvolve_ARGB8888(&inBuffer,&outBuffer, nil, vImagePixelCount(0), vImagePixelCount(0),UInt32(boxSize), UInt32(boxSize), nil, vImage_Flags(kvImageEdgeExtend))
            if (kvImageNoError != error)
            {
                error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, nil, vImagePixelCount(0), vImagePixelCount(0), UInt32(boxSize), UInt32(boxSize), nil, vImage_Flags(kvImageEdgeExtend))
            }
        }

        let colorSpace = CGColorSpaceCreateDeviceRGB()
        let ctx = CGContext(data: outBuffer.data, width: Int(outBuffer.width), height: Int(outBuffer.height), bitsPerComponent: 8, bytesPerRow: outBuffer.rowBytes, space: colorSpace, bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue)
        let imageRef = ctx!.makeImage()
        let returnImage = UIImage.init(cgImage: imageRef!)
        //clean up --- 清理内存
        free(pixelBuffer)
        
        return returnImage
    }