调整drawRect中绘制的矩形的大小 [英] Resizing a rectangle drawn in drawRect

问题描述

我有两个 UIViews 。我的目标是绘制包含这些 UIView 的最小矩形。我想用框架绘制一个矩形，我将从中获取

I have two UIViews. My aim is to draw the smallest rectangle which contains both these UIViews. I thought to draw a rectangle using the frame which I'll get out of

CGRectUnion（view1.frame，view2.frame）;

但当我移动两个 UIView 中的任何一个时，我需要更新框架大纲矩形。

But when I move any of the two UIViews, I need to update the frame of the outlining rectangle.

我以为我可以这样做：

1）调整以前绘制的矩形的大小。

1) Resizing the previously drawn rectangle.

（或）

2）删除先前绘制的矩形并绘制一个新矩形。

2) Deleting the previously drawn rectangle and drawing a new one.

问题在于，我不知道如何获取先前绘制的矩形的实例。所以，我不知道如何更新或删除它..

The problem is that, I don't know how to get the instance of the previously drawn rectangle. So, I don't know how to update or delete it..

你们中的任何人都可以帮忙吗？
这个问题还有其他解决办法吗？

Can any of you guys help? Is there any other solution to this problem?

推荐答案

也许您可以在.h文件中声明以下内容：

Perhaps you can declare the following in your .h file:

CGRect *transformingRect;

这样做应该保留矩形及其属性，只要它所在的任何视图控制器都是可见的，加载。这样你就可以有一个方法来调整同一个绘制的rect的大小。只要你需要调整它就可以调用它。

Doing so should retain the rectangle and its properties so long as whatever view controller this is in is visible and loaded. This way you can have a method that resizes the same drawn rect. You would simply call this whenever you need to resize it.

-(void)resizeRect {
     transformingRect = CGRectUnion(view1.frame, view2.frame);
}

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