如何让Odoo 9使用S3存储桶来存储二进制文件？(How to make Odoo 9 use an S3 bucket to store binary files?)

 根据您之前的问题，我假设图像视图是此自定义视图对象的子视图。 您需要在此类中维护可变数组的路径。 在touchesBegan:withEvent:初始化它，并关闭touchesEnded:withEvent:的路径。 将路径推入阵列。 在每个触摸事件（开始，移动，结束）时，调用一个方法，在将触摸点添加到路径后更新图像视图的图像。 
 
 更新图像将涉及创建空图像上下文，然后在触摸它们时迭代阵列中的所有路径和当前路径。 完成绘制后，从上下文生成图像对象并将其设置为图像。 在我们注意到每条路径的属性可能不同之前，我们会非常直截了当 要处理这个问题，你应该为路径创建一个容器类，它将保存路径的属性。 将此类的对象推送到数组中的每个路径而不是路径本身。 这样您就可以维护视图的状态。 

Based on your earlier question, I am assuming that the image view is a subview of this custom view object. You will need to maintain a mutable array of paths in this class. Initialize it at touchesBegan:withEvent: and close the path at touchesEnded:withEvent:. Push the path into the array. At every touch event (began, moved, ended), call a method that updates the image view's image after adding the touch point to the path.
 
Updating the image will involve creating an empty image context and then iterating over all paths in your array and the current path while stroking them. Once you're done drawing, generate the image object from the context and set it to the image. Pretty straightforward until we notice that each path might differ in attributes. To deal with this you should create a container class for the path which will hold the attributes about the path. Push an object of this class for every path into the array rather than the path itself. This way you can maintain state for your view.