高斯模糊
需要引入<Accelerate/Accelerate.h>類凛捏,一般封裝到image的分類中吞瞪,以便使用箩朴,下面是代碼岗喉,其中blur為模糊程度
#import <Accelerate/Accelerate.h>
/**
高斯模糊
@param image image
@param blur (0 - 1 之間)
@return image
*/
+(UIImage *)boxblurImage:(UIImage *)image withBlurNumber:(CGFloat)blur
{
if (blur < 0.f || blur > 1.f) {
blur = 0.5f;
}
int boxSize = (int)(blur * 100); //100為最大模糊程度
boxSize = boxSize - (boxSize % 2) + 1;
CGImageRef img = image.CGImage;
vImage_Buffer inBuffer, outBuffer;
vImage_Error error;
//從CGImage中獲取數(shù)據(jù)
CGDataProviderRef inProvider = CGImageGetDataProvider(img);
CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);
//設(shè)置從CGImage獲取對(duì)象的屬性
void *pixelBuffer;
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)
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];
//清除;
CGContextRelease(ctx);
CGColorSpaceRelease(colorSpace);
free(pixelBuffer);
CFRelease(inBitmapData);
CGImageRelease(imageRef);
return returnImage;
}
&毛玻璃效果
毛玻璃效果實(shí)現(xiàn)有很多種,大致都是用蒙版的方式實(shí)現(xiàn)如toolbar去做蒙版炸庞,但是由于toolbar的表現(xiàn)不太好钱床,在對(duì)接的地方會(huì)出現(xiàn)白邊,所以我用iOS8出現(xiàn)的模糊處理類去做蒙版
//需要做模糊效果的圖片
UIImageView *testView = [[UIImageView alloc]initWithFrame:self.view.bounds];
[self.view addSubview:testView];
//實(shí)現(xiàn)模糊效果
UIBlurEffect *blurEffrct =[UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
//毛玻璃視圖
UIVisualEffectView *visualEffectView = [[UIVisualEffectView alloc]initWithEffect:blurEffrct];
visualEffectView.frame = self.view.bounds;
//設(shè)置透明度
visualEffectView.alpha = 0.9;
[self.view addSubview:visualEffectView];
切記testView和蒙版的順序不要放反了