ios图片变模糊（ios怎么拍出模糊的照片）

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

ios图片变模糊（ios怎么拍出模糊的照片） -

2. 代码

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 #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, 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]; //clean up cgcontextrelease(ctx); cgcolorspacerelease(colorspace); free(pixelbuffer); cfrelease(inbitmapdata); cgcolorspacerelease(colorspace); cgimagerelease(imageref); return returnimage; } @end