如何以固定宽度获取 NSAttributedString 的高度 [英] How to get height for NSAttributedString at a fixed width
问题描述
我想在固定宽度的框中绘制一些 NSAttributedStrings，但是在计算绘制时它们将占用的正确高度时遇到了麻烦.到目前为止，我已经尝试过:
I want to do some drawing of NSAttributedStrings in fixed-width boxes, but am having trouble calculating the right height they'll take up when drawn. So far, I've tried:
调用
- (NSSize) size，但结果没有用(为此目的)，因为它们会给出字符串所需的任何宽度.
Calling
- (NSSize) size, but the results are useless (for this purpose), as they'll give whatever width the string desires.
调用 - (void)drawWithRect:(NSRect)rect options:(NSStringDrawingOptions)options 用一个矩形形状为我想要的宽度和 NSStringDrawingUsesLineFragmentOrigin 在选项，与我在绘图中使用的完全一样.结果……难以理解；当然不是我要找的.(正如许多地方所指出的，包括this Cocoa-Dev 线程).
Calling - (void)drawWithRect:(NSRect)rect options:(NSStringDrawingOptions)options with a rect shaped to the width I want and NSStringDrawingUsesLineFragmentOrigin in the options, exactly as I'm using in my drawing. The results are ... difficult to understand; certainly not what I'm looking for. (As is pointed out in a number of places, including this Cocoa-Dev thread).
创建一个临时的 NSTextView 并执行:[[tmpView textStorage] setAttributedString:aString];
[tmpView setHorizontallyResizable:NO];
[tmpView sizeToFit];
当我查询 tmpView 的框架时，宽度仍然是所需的，并且高度通常是正确的......直到我得到更长的字符串时，它通常是所需大小的一半.(似乎没有达到最大尺寸:一帧高 273.0(约 300 太短)，另一帧是 478.0(只有 60 左右太短)).
Creating a temporary NSTextView and doing:
[[tmpView textStorage] setAttributedString:aString];
[tmpView setHorizontallyResizable:NO];
[tmpView sizeToFit];
When I query the frame of tmpView, the width is still as desired, and the height is often correct ... until I get to longer strings, when it's often half the size that's required. (There doesn't seem to be a max size being hit: one frame will be 273.0 high (about 300 too short), the other will be 478.0 (only 60-ish too short)).
如果有其他人解决了这个问题，我将不胜感激.
I'd appreciate any pointers, if anyone else has managed this.
推荐答案
答案是使用- (void)drawWithRect:(NSRect)rect options:(NSStringDrawingOptions)options
但是你传入的 rect 在你想要无限的维度上应该有 0.0(呃，这很有意义).示例 此处.
The answer is to use
- (void)drawWithRect:(NSRect)rect options:(NSStringDrawingOptions)options
but the rect you pass in should have 0.0 in the dimension you want to be unlimited (which, er, makes perfect sense). Example here.
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