UIBlurEffect * blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark]; UIVisualEffectView * effe = [[UIVisualEffectView alloc]initWithEffect:blur];
http://www.ithao123.cn/content-8310026.html
ios8 毛玻璃效果
原文：http://www.cnblogs.com/wxm5558/p/6868918.html
