Quartz 2d / Core Graphics：绘制某些文本的正确方法是什么？ [英] Quartz 2d / Core Graphics: What is the right way to draw some text?

问题描述

我已经有一段时间了，在石英2d中似乎有很多方法可以解决这个问题：

I've been at this for awhile, it seems that there's many ways to go about this in quartz 2d:

1）使用核心图形方法绘制文本。 ..

1) Draw text using core graphics methods...

CGContextSelectFont
CGContextSetRGBFillColor
CGContextShowTextAtPoint

等等，这是非常低的水平。

and on and on, which is horribly low level.

2）使用NSString drawAtPoint

2) using NSString drawAtPoint

（到目前为止，我喜欢的方法）

(so far the method I like)

NSString* text = @"Hello";
[text drawAtPoint:point withFont:font];

3）使用UILabel

3) using UILabel

I'我在某处阅读过此书，但不太确定是否可行。但我认为在drawRect中实例化UILabel会非常昂贵，因为drawRect可能被称为无数次。

I've read this somewhere but not too sure if this is possible. but I'm thinking that instantiating a UILabel within drawRect would be pretty costly as drawRect probably gets called a zillion times. ??

我现在可以2。（使用NSString drawAtPoint），但是我想得到一些意见。再次，我试图在drawRect（我将视图子类化）中创建文本，因为我同时也在绘制图形和文本，正确的方法是什么？

I'm doing ok with 2. (using NSString drawAtPoint) for the moment but I wanted to get some opinions. Again, I'm trying to create text within drawRect (I subclassed a view) because I'm also drawing shapes along with text, what is the right way?

谢谢

推荐答案

＃1不支持国际字符。因此，如果使用它来绘制用户输入的文本，请不要使用它。

#1 doesn't support international characters. So, don't use it if you use it to draw texts inputted by a user.

因此，请使用＃2，除非您绝对确保文本仅包含标准ASCII字符。

So, please use #2 unless you're absolutely sure that the text only contains standard ASCII characters.

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