ios实现毛玻璃效果-尊龙凯时

使用core image

//生成一张毛玻璃图片
- (uiimage *)blur:(uiimage *)theimage
{
    cicontext *context = [cicontextcontextwithoptions:nil];
    ciimage *inputimage = [ciimageimagewithcgimage:theimage.cgimage];

    cifilter *filter = [cifilterfilterwithname:@"cigaussianblur"];
    [filter setvalue:inputimageforkey:kciinputimagekey];
    [filter setvalue:[nsnumbernumberwithfloat:15.0]forkey:@"inputradius"];//其中数值是模糊度（3～30，越大越模糊）
    ciimage *result = [filtervalueforkey:kcioutputimagekey];

    cgimageref cgimage = [contextcreatecgimage:resultfromrect:[inputimageextent]];

    uiimage *returnimage = [uiimageimagewithcgimage:cgimage];
    cgimagerelease(cgimage);
    return returnimage;

}

系统方法，ios8以上

//方法一：系统方法，ios8及以上可用
    if (!uiaccessibilityisreducetransparencyenabled()) {
        uiblureffect *blureffect = [uiblureffecteffectwithstyle:uiblureffectstyledark];
        uivisualeffectview *blureffectview = [[uivisualeffectviewalloc]initwitheffect:blureffect];
        blureffectview.frame = _imageview.bounds;
        [_imageview addsubview:blureffectview];

}

上述两种方法可以配合使用，效果可以增加光亮度