将NSString绘制为UIImage [英] Drawing NSString to UIImage

问题描述

我有一个NSString对象。
我想将它写入现有的UIImage对象。
UIImage对象已经有一些与之关联的图像。
我想将字符串写入同一图像。
我如何实现它？

I have a NSString object. I want to write it to existing UIImage object. UIImage object already has some image associate with it. I want to write string to same image. How do i achieve it?

推荐答案

编辑：
以下是实现编辑的基本步骤UIImage并在其上写文字。

Following are basic step to achieve to edit an UIImage and write text on it.

1. 从UIImage获取CGImage。


2. 渲染CGImage在上下文中。


3. 在同一个上下文中渲染要写入的文本。


4. 获取上下文的位图并使其成为CGImage。


5. 从CGImage获取UIImage ....

1. Get CGImage from UIImage.
2. Render CGImage On context.
3. Render Text you want to write on the same context.
4. Get Bitmap of context and make CGImage out of that.
5. Get UIImage from CGImage....

显示文本和标签并显示更容易在图像视图上。
并且答案已经存在。

It would be much easier to show text on and label and show that on image view. And answer for that are already there.

然后将其更新为文件或在屏幕上显示....

Then Update it to file or show it on the screen....

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