图片的高斯模糊处理

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//使用图片初始化

UIImageView *imm = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 220)];

[imm setImage:[UIImage imageNamed:@"2.jpg"]];

[self.view addSubview:imm];

//添加模糊

UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];

UIVisualEffectView *effectview = [[UIVisualEffectView alloc] initWithEffect:blur];

effectview.frame = CGRectMake(0, 0, imm.frame.size.width, 220);

[imm addSubview:effectview];

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效果图