iOS实现背景高斯模糊效果

废话不多说，实现简单的高斯模糊的效果代码：

  uiview *bgview= [[uiviewalloc]initwithframe:self.view.frame];
//  bgview.backgroundcolor = [uicolor blackcolor];
//  bgview.alpha = 0.9;
  bgview.tag =10086;
  [self.viewaddsubview:bgview];
  uiblureffect *blur = [uiblureffecteffectwithstyle:uiblureffectstylelight];
  uivisualeffectview *effectview = [[uivisualeffectviewalloc] initwitheffect:blur];
  effectview.frame =self.view.frame;
  [bgview addsubview:effectview];

这写代码只是简单的实现高斯模糊。关于消除，把它remove就行了。

关于图片的高斯模糊，首先拿到图片：

cicontext *context = [cicontext contextwithoptions:nil]; 
  ciimage *inputimage = [[ciimage alloc] initwithimage:[uiimage imagenamed:@"1.png"]]; 
  // create gaussian blur filter 
  cifilter *filter = [cifilter filterwithname:@"cigaussianblur"]; 
  [filter setvalue:inputimage forkey:kciinputimagekey]; 
  [filter setvalue:[nsnumber numberwithfloat:10.0] forkey:@"inputradius"]; 
  // blur image 
  ciimage *result = [filter valueforkey:kcioutputimagekey]; 
  cgimageref cgimage = [context createcgimage:result fromrect:[result extent]]; 
  uiimage *image = [uiimage imagewithcgimage:cgimage]; 
  cgimagerelease(cgimage); 
  self.mainimageview.image = image; 

以上所述是小编给大家介绍的ios实现背景高斯模糊效果，希望对大家有所帮助