将UIImage和UIBezierPath合并为1个UIImage

Question

我的视图中有UIImage和DrawView作为子视图。绘制视图响应触摸并创建UIBezierPath以在图像上绘制。当用户接受他们的更改时，我需要将创建的基础UIImage和任何UIBezierPath合并为一个UIImage。

Answer 1

将UIBazierPath作为DrawView的公共财产，并在用户从DrawView内抽取时继续更新。当用户点击“接受”按钮时，使用以下代码只需在上下文中创建UIImageContext和绘制两者，sourceImage和bezierPath。最后，在resultImage中对上下文中绘制的内容进行处理。

UIBezierPath *path = drawView.Path // Your Bezier Path in DrawView
UIImage *sourceImage = sourceImageView.image; // Your Source Image from ImageView.
UIImage *resultImage = nil;
UIGraphicsBeginImageContext(sourceImage.size);
[sourceImage drawInRect:(CGRect){CGPointZero, sourceImage.size}];
[path stroke]; //Fill or Stroke path as you need.
[path fill];

resultImage = UIGraphicsGetImageFromCurrentImageContext(); //taking the merged result from context, in a new Image. This is your required image.

UIGraphicsEndImageContext();

//Use resultImage as you want.