//添加一个图片

    UIImageView *imageview = [[UIImageView alloc]init];

    imageview.frame = CGRectMake(10, 100, 300, 300);

    

    imageview.contentMode = UIViewContentModeScaleAspectFit;

    

    imageview.userInteractionEnabled = YES;

    

    imageview.image = [UIImage imageNamed:@"3.jpg"];

    

    [self.view addSubview:imageview];

    

    //模糊效果代码

   UIBlurEffect *errect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight];

    UIVisualEffectView *ectView = [[UIVisualEffectView alloc]initWithEffect:errect];

    ectView.alpha = 0.6;

    

   ectView.frame = CGRectMake(0, 0, imageview.frame.size.width/2, 300);

    

    

    [imageview addSubview:ectView];

    

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

    

    btn.frame =CGRectMake(10,50, 100, 40);

    [btn setTitle:@"btn"forState:UIControlStateNormal];

    [ectView.contentView addSubview:btn];

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