我怎么能概述文字字体？ [英] How could I outline Text font?

问题描述

我想在其边框（轮廓）中显示另一种颜色的文字。
我正在尝试使用

I would like to display text with another color in it's border (outline). i'm trying to display a text in MapOverlayView using

[text drawAtPoint:CGPointMake(0,30) withFont:[UIFont fontWithName:@"Helvetica-Bold" size:(3 * MKRoadWidthAtZoomScale(zoomScale))] 

它工作正常，除了我需要显示文字轮廓。

it works fine except I need text to be displayed outlines.

推荐答案

是的，您可以借助<显示轮廓文本code> CGContextSetDrawingMode（CGContextRef，CGTextDrawingMode），虽然您可能需要调整一些数字和颜色以使其看起来不错。

Yes, you can display outlined text with the aid of CGContextSetDrawingMode(CGContextRef, CGTextDrawingMode), although you'll probably need to adjust some numbers and colors to make it look good.

使用kCGTextFillStroke似乎合乎逻辑，但这会使笔划压倒填充。如果你描边，然后填充，如下面的方块，你会得到可读文本背后的可见轮廓。

It make seem logical to use kCGTextFillStroke, but that can make the stroke overwhelm the fill. If you stroke, then fill, as in the block below, you get a visible outline behind readable text.

CGContextRef context = UIGraphicsGetCurrentContext();

CGPoint point = CGPointMake(0,30);
CGFloat fontSize = (3 * MKRoadWidthAtZoomScale(zoomScale));
UIFont *font = [UIFont fontWithName:@"Helvetica-Bold" size:fontSize];

// Draw outlined text.
CGContextSetTextDrawingMode(context, kCGTextStroke);
// Make the thickness of the outline a function of the font size in use.
CGContextSetLineWidth(context, fontSize/18);
CGContextSetStrokeColorWithColor(context, [[UIColor redColor] CGColor]);
[text drawAtPoint:point withFont:font];

// Draw filled text.  This will make sure it's clearly readable, while leaving some outline behind it.
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetFillColorWithColor(context, [[UIColor blueColor] CGColor]);
[text drawAtPoint:point withFont:font];

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