xcode NSString sizeWithAttributes: 内容矩形
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原文地址: http://stackoverflow.com/questions/1992950/
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NSString sizeWithAttributes: content rect
提问by Alexandre Cassagne
How do I get a NSString's size as if it drew in an NSRect. The problem is when I try -[NSString sizeWithAttributes:], it returns an NSSize as if it had infinite width. I want to give a maximum width to the method. Is there any way of doing so? (BTW: Mac OS, not iPhone OS)
我如何获得 NSString 的大小，就像它是在 NSRect 中绘制的一样。问题是当我尝试 -[NSString sizeWithAttributes:] 时，它返回一个 NSSize，就好像它有无限宽度一样。我想为该方法提供最大宽度。有没有办法这样做？（顺便说一句：Mac 操作系统，而不是 iPhone 操作系统）
Thanks, Alex
谢谢，亚历克斯
回答by Alexandre Cassagne
float heightForStringDrawing(NSString *myString, NSFont *myFont,
float myWidth)
{
NSTextStorage *textStorage = [[[NSTextStorage alloc] initWithString:myString] autorelease];
NSTextContainer *textContainer = [[[NSTextContainer alloc] initWithContainerSize:NSMakeSize(myWidth, FLT_MAX)] autorelease];
;
NSLayoutManager *layoutManager = [[[NSLayoutManager alloc] init] autorelease];
[layoutManager addTextContainer:textContainer];
[textStorage addLayoutManager:layoutManager];
[textStorage addAttribute:NSFontAttributeName value:myFont
range:NSMakeRange(0, [textStorage length])];
[textContainer setLineFragmentPadding:0.0];
(void) [layoutManager glyphRangeForTextContainer:textContainer];
return [layoutManager
usedRectForTextContainer:textContainer].size.height;
}
It was in the docs after all. Thank you Joshua anyway!
毕竟它在文档中。无论如何，谢谢约书亚！
回答by ma11hew28
I revised Alexandre Cassagne's answerfor iOS with ARC enabled.
我在启用 ARC 的情况下修改了Alexandre Cassagne对 iOS的回答。
CGSize ACMStringSize(NSString *string, UIFont *font, CGSize size)
{
NSTextStorage *textStorage = [[NSTextStorage alloc] initWithString:string];
[textStorage addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, [textStorage length])];
NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:size];
textContainer.lineFragmentPadding = 0;
[layoutManager addTextContainer:textContainer];
[textStorage addLayoutManager:layoutManager];
return [layoutManager usedRectForTextContainer:textContainer].size;
}
回答by ingconti
for OSX cocoa/Swift 4: (using a custom NSview, to show also how to draw)
对于 OSX cocoa/Swift 4：（使用自定义 NSview，还展示如何绘制）
//
// CustomView.swift
// DrawMyString
//
// Created by ing.conti on 19/10/2018.
// Copyright ? 2018 com.ingconti. All rights reserved.
//
import Cocoa
class CustomView: NSView {
override func draw(_ dirtyRect: NSRect) {
super.draw(dirtyRect)
let s : NSString = "AA BB CC DD EE FF"
let W = 50
let size = NSSize(width: W, height: 100)
let boundingRectWithSize = s.boundingRect(with: size, options: .usesLineFragmentOrigin, attributes: [:])
let r = NSRect(origin: CGPoint(x: 20, y: 30), size: boundingRectWithSize.size)
s.draw(in: r, withAttributes: [:])
r.frame()
}
}
(we also draw border, to see it)
（我们也画边框，看看吧）
回答by Joshua Nozzi
I believe your only option here is NSLayoutManager and asking for a union of the used rects for a given glyph range.
我相信你在这里唯一的选择是 NSLayoutManager 并要求为给定的字形范围合并使用的矩形。
