从 UIView 制作 UIImage 但不在主线程中

发布于 2024-10-15 23:40:54 字数 650 浏览 2 评论 0原文

我正在使用众所周知的模式从 UIView 创建 UIImage：

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

现在，我的问题是我有一个非常复杂的视图，上面有很多子视图，所以这个转换过程大约需要3+(!!!)秒。

我尝试将其分叉到另一个在后台运行的线程中，它确实提高了性能。

唯一的问题是，据我所知，不允许在主线程之外制作与 UI 相关的内容。

我错了吗？这完全没问题吗？或者 - 如果我是对的 - 可以采取什么措施来提高性能？有没有其他方法可以在不同的线程中使用但效果相同？

多谢！

原文

I'm using the well-known pattern to create an UIImage from an UIView:

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

Now, my problem is that i have a very complex view with a lot of subviews on it, so this process of conversion takes about 3+(!!!) seconds.

I tried forking it into another thread that run in the background and it really did improve the performance.

The only problem is that as can I remember, it is not allowed to make UI related stuff not in the main thread.

Am I wrong and this is perfectly fine?
Or - if i'm right - what can be done to improve performance? is there any other method that i can use in a different thread but does the same work?

Thanks a lot!

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