#import <UIKit/UIKit.h>#import <Accelerate/Accelerate.h>#import <QuartzCore/QuartzCore.h>@interface UIImage (Blur)// 0.0 to 1.0- (UIImage*)blurredImage:(CGFloat)blurAmount;@end#import "UIImage+Blur.h"@implementation UIImage (Blur)- (UIImage*)blurredImage:(CGFloat)blurAmount{    if (blurAmount < 0.0 || blurAmount > 1.0) {        blurAmount = 0.5;    }        int boxSize = (int)(blurAmount * 40);    boxSize = boxSize - (boxSize % 2) + 1;        CGImageRef img = self.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));        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) {        error = vImageBoxConvolve_ARGB8888(&outBuffer, &inBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);        if (!error) {            error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);        }    }        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();        CGContextRef ctx = CGBitmapContextCreate(outBuffer.data,                                             outBuffer.width,                                             outBuffer.height,                                             8,                                             outBuffer.rowBytes,                                             colorSpace,                                             (CGBitmapInfo)kCGImageAlphaNoneSkipLast);        CGImageRef imageRef = CGBitmapContextCreateImage (ctx);        UIImage *returnImage = [UIImage imageWithCGImage:imageRef];        CGContextRelease(ctx);    CGColorSpaceRelease(colorSpace);        free(pixelBuffer);    CFRelease(inBitmapData);        CGColorSpaceRelease(colorSpace);    CGImageRelease(imageRef);        return returnImage;}@end

// 使用 

  UIImage *image = [[UIImage imageNamed:@"xxxx.png"] blurredImage:0.6];