如何在NSView中旋转文本?(Mac OS，可可，Swift) [英] How to rotate text in NSView? (Mac OS, Cocoa, Swift)

问题描述

我是Mac OS 10.11(不是iOS)的Cocoa/Swift应用程序的新手.我创建了一个 NSView ，其大小为 A4 纸，并使用 drawRect()中的 NSString.drawAtPoint 绘制了一些简单的线条和一些文本.到目前为止，一切正常.

I am new to Cocoa/Swift applications for Mac OS 10.11 (Not iOS). I created an NSView with the size of A4 paper, drew some simple lines and some text using NSString.drawAtPoint within drawRect(). So far it works.

但是，有时我需要将几个字符旋转90度，并且一些文本需要在X或Y方向上缩放.那是我不知道怎么做的地方.请有人能告诉我如何实现这些目标吗?

However, from time to time, I need a few characters to be turned 90 degrees, and some text needs to be scaled at X, or Y direction. That is where I don't know how to do it. Please can someone tell me how to achieve these?

非常感谢.

推荐答案

您可以使用 NSAffineTransform .这段代码绘制了一个顺时针旋转90度的大写字母"A":

You can use NSAffineTransform. This code draws a capital "A" rotated 90 degrees clockwise:

[NSGraphicsContext saveGraphicsContext]; // save current affine transform
[[[NSAffineTransform transform] rotateByDegrees:90] concat];
[@"A" drawAtPoint:point withAttributes:@{}];
[NSGraphicsContext restoreGraphicsContext]; // restore original transform

请注意， rotateByDegrees 会围绕原点旋转图形上下文.如果要围绕其他点旋转，则需要添加几个平移.这个 concat 是一个围绕 rotatePoint 旋转的变换:

Note that rotateByDegrees rotates the graphics context around the origin point. If you want to rotate around some other point, you need to add a couple of translations. This concats a transform that rotates around rotatePoint:

NSAffineTransform *transform = [NSAffineTransform transform];
[transform translateXBy:rotatePoint.x yBy:rotatePoint.y];
[transform rotateByDegrees:90];
[transform translateXBy:-rotatePoint.x yBy:-rotatePoint.y];
[transform contat];

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