如何获得固定宽度的NSAttributedString的高度 [英] How to get height for NSAttributedString at a fixed width
问题描述
我想在固定宽度框中做一些NSAttributedStrings的绘图，但是我无法计算绘制时它们会占用的正确高度。到目前为止，我尝试了：
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
Calling
- (NSSize) size, but the results are useless (for this purpose), as they'll give whatever width the string desires.
调用，但是结果是无用的（为了这个目的） - （void）drawWithRect：（NSRect）rect选项：（NSStringDrawingOptions）选项使用一个rect形状到我想要的宽度和 NSStringDrawingUsesLineFragmentOrigin ，正如我在我的画中使用。结果是...难以理解;肯定不是我想要的。 （正如在许多地方指出的，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).
创建临时NSTextView并执行：
[[tmpView textStorage] setAttributedString：aString];
[tmpView setHorizontallyResizable：NO];
[tmpView sizeToFit];
当我查询tmpView的框架，宽度仍然是所需的，高度通常是正确的...直到我得到更长的字符串，当它通常是一半所需的尺寸。 （似乎没有最大尺寸被击中：一帧将是273.0高（约300太短），另一个将是478.0（只有60-ish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)).
如果任何其他人管理这个指令，我会感激任何指针。
I'd appreciate any pointers, if anyone else has managed this.
推荐答案
使用
- （void）drawWithRect：（NSRect）rect options：（NSStringDrawingOptions） / code>
，但传入的 rect 应该在您想要的无限维度上（0.0，感）。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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