ios - 如何截取 UIView 的屏幕截图并使用它具有模糊背景？

Question

我有一个 View Controller ，它由一个容器 View 组成，容器 View 是 ImageView 上方屏幕大小的一半，最初是隐藏的。容器嵌入了 tableView。我有一个按钮，点击它会显示容器 View ，第二次点击它会隐藏。当容器 View 打开时，背景 View 应该是模糊的。对于那个模糊 View ，我想截取屏幕截图图像具有背景的原始 View 位置的屏幕截图并对其进行模糊处理。 这个我试过了

- (UIImage *) imageWithView:(UIView *)view
 {
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque,     [[UIScreen mainScreen] scale]);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    _imageView.image = [UIImage imageNamed:@"img"];
    return img;
 }


- (IBAction)clickToBlur:(id)sender {

    [self imageWithView:_imageView];
    _imageView.image = [UIImage imageNamed:@"img"];


    if (!UIAccessibilityIsReduceTransparencyEnabled()) {
        self.view.backgroundColor = [UIColor clearColor];
        UIBlurEffect *blurEffect = [UIBlurEffect       effectWithStyle:UIBlurEffectStyleLight];
        UIVisualEffectView *blurEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect  ];
        blurEffectView.frame = self.view.bounds;
        blurEffectView.backgroundColor = [[UIColor whiteColor]colorWithAlphaComponent:0.6];
        blurEffectView.frame = CGRectMake(0, 28, 375, 554);
        blurEffectView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

        [self.view addSubview:blurEffectView];
    } else {
        self.view.backgroundColor = [UIColor blackColor];
    }
}

Answer 1

制作自定义 View ，然后拍摄屏幕截图并将其固定在该 View 上，并使您的 View 背景模糊

截图代码:

- (UIImage *) screenshot {

     CGSize size = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height);

     UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);

     CGRect rec = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
     [self.view drawViewHierarchyInRect:rec afterScreenUpdates:YES];

     image = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();
     return image;
 }