iOS->将2个UIImageView保存到cameraRoll

发布于 2024-11-25 07:49:42 字数 269 浏览 1 评论 0原文

我有两层 UIImageView，上面一层是部分透明的，第二层是“背景”。我想将它们保存起来，就像用户从前面看到它们一样，放入相机卷中以供用户使用。问题是这样写：

if(gridUpperLayer == transparent) {drawGridLowerLayer} 
else {drawGridUpperLayer}

会非常慢（而且我不知道如何实现它）。有人知道如何以更快的方式做到这一点吗？最好是有例子，但我将不胜感激^^ 干杯并提前感谢您！

原文

i have two layers of UIImageView, upper one is partly transparent, second in is 'background'. I want to save them both like user see them from front into cameraRoll for user's use. The problem is writing it in way:

if(gridUpperLayer == transparent) {drawGridLowerLayer} 
else {drawGridUpperLayer}

will be very slow (and i dont know how to implement it). Anybody has idea how to do it in faster way..? Best would be with example but i would be grateful for anything ^^
Cheers and thank you in advance!

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鹿港巷口少年归 2024-12-02 07:49:42

您可以通过将 CALayer 渲染为包含这两个图像的 UIView 的图像来实现此目的。以下代码如下所示：

UIGraphicsBeginImageContext(containerView.frame.size);
[containerView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *anImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

//将图像保存到磁盘

You can do this by rendering the CALayer into an image for the UIView that contains both of the images. The following code would look like:

UIGraphicsBeginImageContext(containerView.frame.size);
[containerView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *anImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

//save anImage to disk

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