[绍棠] 高斯模糊效果汇总

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一. iOS7之前

创建一个UIToolbar实例,设置它的frame或者也可以通过添加约束

然后UIToolbar有一个属性:barStyle,设置对应的枚举值来呈现毛玻璃的样式,最后再添加到需要进行毛玻璃效果的view上即可.

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/*
毛玻璃的样式(枚举)
UIBarStyleDefault = ,
UIBarStyleBlack = ,
UIBarStyleBlackOpaque = , // Deprecated. Use UIBarStyleBlack
UIBarStyleBlackTranslucent = , // Deprecated. Use UIBarStyleBlack and set the translucent property to YES
*/
UIImageView *bgImgView = [[UIImageView alloc] initWithFrame:self.view.bounds];
bgImgView.image = [UIImage imageNamed:@"huoying.jpg"];
[self.view addSubview:bgImgView];
UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(, , bgImgView.frame.size.width*., bgImgView.frame.size.height)];
toolbar.barStyle = UIBarStyleBlackTranslucent;
[bgImgView addSubview:toolbar];

二. iOS8

实例化UIBlurEffect并设置毛玻璃的样式,然后再通过UIVisualEffectView的构造方法将UIBlurEffect的实例添加上去最后设置frame或者是通过添加约束, 将effectView添加到要实现了毛玻璃的效果的view控件上,效果图和上面的一样.

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UIImageView *bgImgView = [[UIImageView alloc] initWithFrame:self.view.bounds];
bgImgView.image = [UIImage imageNamed:@"huoying.jpg"];
bgImgView.contentMode = UIViewContentModeScaleAspectFill;
//[bgImgView setImageToBlur: [UIImage imageNamed:@"huoying.jpg"] blurRadius: completionBlock:nil];
bgImgView.userInteractionEnabled = YES;
[self.view addSubview:bgImgView];
/*
毛玻璃的样式(枚举)
UIBlurEffectStyleExtraLight,
UIBlurEffectStyleLight,
UIBlurEffectStyleDark
*/
UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];
effectView.frame = CGRectMake(, , bgImgView.frame.size.width*., bgImgView.frame.size.height);
[bgImgView addSubview:effectView];

三. 导入

#import <Accelerate/Accelerate.h>

+(UIImage *)boxblurImage:(UIImage *)image withBlurNumber:(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;

//从CGImage中获取数据

CGDataProviderRef inProvider =CGImageGetDataProvider(img);

CFDataRef inBitmapData =CGDataProviderCopyData(inProvider);

//设置从CGImage获取对象的属性

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,

outBuffer.rowBytes,

colorSpace,

kCGImageAlphaNoneSkipLast);

CGImageRef imageRef =CGBitmapContextCreateImage (ctx);

UIImage *returnImage = [UIImageimageWithCGImage:imageRef];

//clean up

CGContextRelease(ctx);

CGColorSpaceRelease(colorSpace);

free(pixelBuffer);

CFRelease(inBitmapData);

CGColorSpaceRelease(colorSpace);

CGImageRelease(imageRef);

return returnImage;

}

调用

self.imageView=[[UIImageViewalloc]initWithFrame:CGRectMake(0,300,SCREENWIDTH,100)];

self.imageView.contentMode=UIViewContentModeScaleAspectFill;

self.imageView.image=[UIImageboxblurImage:[UIImageimageNamed:@"Person"]withBlurNumber:0.5];

self.imageView.clipsToBounds=YES;

[self.viewaddSubview:self.imageView]

github地址: https://github.com/happycoco/UIimageBlur

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