-(void)addViewWithWindows
{
self.contentView = [[UIImageView alloc]init];
self.contentView.frame = self.window.frame;
UIImage *image = [UIImage captureWithView:[self.window.subviews lastObject]];
self.contentView.image = [self blurryImage:image withBlurLevel:0.18];
UIWindow *window = [UIApplication sharedApplication].windows[0];
[window addSubview:self.contentView];
}

-(UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur
{
if (blur <0.f || blur > 1.f)
{
blur = 0.5f;
}
//判断曝光度
int boxSize = (int)(blur * 100);//放大100 小数点后面2位有效
boxSize = boxSize - (boxSize % 2) + 1;//如果是偶数 变奇数
CGImageRef img = image.CGImage;//获取图片指针
vImage_Buffer inBuffer,outBuffer;//获取缓冲区
vImage_Error error;//一个错误类，调用画图函数的时候调用
void pixelBuffer;
CGDataProviderRef inprovider = CGImageGetDataProvider(img);//放回一个数组图片
CFDataRef inbitmapData = CGDataProviderCopyData(inprovider);//拷贝数据
inBuffer.width = CGImageGetWidth(img);//放回位图的宽度
inBuffer.height = CGImageGetHeight(img);//放回位图的高度
inBuffer.rowBytes = CGImageGetBytesPerRow(img);//算出位图的字节
inBuffer.data = (void)CFDataGetBytePtr(inbitmapData);//填写图片信息
pixelBuffer = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));//创建一个空间
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(@"%zd",error);
}
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(outBuffer.data, outBuffer.width, outBuffer.height, 8, outBuffer.rowBytes, colorSpace, CGImageGetBitmapInfo(image.CGImage));
CGImageRef imageRef = CGBitmapContextCreateImage(ctx);
UIImage *returnImage = [UIImage imageWithCGImage:imageRef];
CGContextRelease(ctx);
CGColorSpaceRelease(colorSpace);
free(pixelBuffer);
CFRelease(inbitmapData);
CGColorSpaceRelease(colorSpace);
CGImageRelease(imageRef);
return returnImage;
}