UIBlurEffect*blur = [UIBlurEffecteffectWithStyle:UIBlurEffectStyleDark];

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

effectview.frame= [[UIScreenmainScreen]bounds];

effectview.contentView.backgroundColor= [UIColorgreenColor];

effectview.contentView.alpha=0.1;

//    UIImage *image = [self  imageWithCaputureView:blackView];

UIView*view = [[UIViewalloc]initWithFrame:CGRectMake(0,0,375,600)];

[viewaddSubview:effectview];

UIButton*button = [UIButtonbuttonWithType:UIButtonTypeCustom];

button.backgroundColor= [UIColorredColor];

[buttonsetTitle:@"我是一个按钮"forState:0];

button.frame=CGRectMake(10,100,100,50);

[viewaddSubview:button];

//    self.imageview = view;

[self.viewinsertSubview:viewbelowSubview:redView];