用它的孩子渲染 UIView [英] Rendering UIView with its children

问题描述

我有一个 UIView，它有一个图像和一些按钮作为它的子视图.我想使用 renderInContext 或其他方法获取它的快照"图像.

I have a UIView that has an image and some buttons as its subviews. I'd like to get a "snapshot" image of it using renderInContext, or other method.

[clefView.layer renderInContext:mainViewContentContext];

如果我将它传递给我的 UIView(如上所述)，那么我会得到一个空白位图.没有孩子被渲染到位图中.

If I pass it my UIView (as above) then I get a blank bitmap. None of the children are rendered into the bitmap.

如果我将作为图像的子视图传递给它，那么我将获得该位图的图像，并且不出所料，没有它的兄弟姐妹(按钮).

If I pass it the child view that is the image, then I get an image of that bitmap, and, unsurprisingly, none of its siblings (buttons).

我有点希望 renderInContext 能够获取图像和所有可见的子元素并将其渲染为位图.有没有人有任何想法如何做到这一点?

I was sort of hoping that renderInContext would take the image and all it's visible children and render it into a bitmap. Has anyone have any ideas how to do this?

推荐答案

试试这个:

UIGraphicsBeginImageContext(clefView.bounds.size);
[clefView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

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