iOS图片模糊效果的实现方法

本文为大家分享了ios图片模糊效果的三种实现方式，供大家参考，具体内容如下

1.实现效果依次如图：原图、ios8效果、core image效果、 vimage 效果

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2. 代码

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#import "viewcontroller.h"

#import <accelerate/accelerate.h>

@interface viewcontroller ()

@end

@implementation viewcontroller

- (void)viewdidload {

[super viewdidload];

self.view.backgroundcolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"background"]];

// [self ios8blurimageimplement];

// [self coreimageimplement];

[self vimageimplement];

}

// ios8 使用系统自带的处理方式

- (void)ios8blurimageimplement {

uiblureffect *beffect = [uiblureffect effectwithstyle:uiblureffectstylelight];

uivisualeffectview *view = [[uivisualeffectview alloc] initwitheffect:beffect];

view.frame = self.view.bounds;

[self.view addsubview:view];

}

// 使用coreimage实现图片模糊

- (void)coreimageimplement{

cicontext *context = [cicontext contextwithoptions:nil];

nserror *error = nil;

nsstring *filepath = [[nsbundle mainbundle] pathforresource:@"background" oftype:@"png"];

nsdata *imagedata = [nsdata datawithcontentsoffile:filepath options:nsdatareadinguncached error:&error];

//nsdata *imagedata = [nsdata datawithcontentsoffile:@"background.png"];

ciimage *image = [ciimage imagewithdata:imagedata];

cifilter *filter = [cifilter filterwithname:@"cigaussianblur"];

[filter setvalue:image forkey:kciinputimagekey];

[filter setvalue:@2.0f forkey:@"inputradius"];

ciimage *result = [filter valueforkey:kcioutputimagekey];

cgimageref outimage = [context createcgimage:result fromrect:[result extent]];

uiimage *bluerimage = [uiimage imagewithcgimage:outimage];

uiimageview *imageview = [[uiimageview alloc] initwithimage:bluerimage];

imageview.frame = self.view.bounds;

[self.view addsubview:imageview];

}

// 使用vimage api实现图片模糊

// ios5.0中新增了vimage api可以使用，它属于accelerate.framework，所以如果你要使用它要在工程中加入这个framework。模糊算法使用的是vimageboxconvolve_argb8888这个函数。

- (void)vimageimplement {

uiimage *image = [uiimage imagenamed:@"background"];

uiimage *blurimage = [self blurryimage:image withblurlevel:0.5];

self.view.backgroundcolor = [uicolor colorwithpatternimage:blurimage];

}

- (uiimage *)blurryimage:(uiimage *)image withblurlevel:(cgfloat)blur {

if (blur < 0.f || blur > 1.f) {

blur = 0.5f;

}

int boxsize = (int)(blur * 100);

boxsize = boxsize - (boxsize % 2) + 1;

cgimageref img = image.cgimage;

vimage_buffer inbuffer, outbuffer;

vimage_error error;

voidvoid *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,

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;

}

@end

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。

iOS图片模糊效果的实现方法

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