IOS 文字轨迹path

最新推荐文章于 2024-04-11 01:40:12 发布

原创最新推荐文章于 2024-04-11 01:40:12 发布 · 1k 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#ios #path

IOS 专栏收录该内容

12 篇文章

订阅专栏

这篇博客介绍了如何在iOS中将字符串转化为BezierPath，通过CoreText创建CTFont对象，然后利用NSAttributedString来构建带字体属性的字符串，最终获取文字的路径。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

@implementation NSString (Glyphs)

-(UIBezierPath*)bezierPathWithFont:(UIFont*)font {
CTFontRef ctFont = CTFontCreateWithName((__bridge CFStringRef)font.fontName, font.pointSize, NULL);
//
NSAttributedString attributed = [[NSAttributedString alloc] initWithString:self attributes:[NSDictionary dictionaryWithObject:(__bridge id)ctFont forKey:(__bridge NSString)kCTFontAttributeName]];
CFRelease(ctFont);

CGMutablePathRef letters = CGPathCreateMutable();
CTLineRef line = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)attributed);
CFArrayRef runArray = CTLineGetGlyphRuns(line);
for (CFIndex runIndex = 0; runIndex < CFArrayGetCount(runArray); runIndex++)
{
    CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, runIndex);
    CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName);

    for (CFIndex runGlyphIndex = 0; runGlyphIndex < CTRunGetGlyphCount(run); runGlyphIndex++)
    {
        CFRange thisGlyphRange = CFRangeMake(runGlyphIndex, 1);
        CGGlyph glyph;
        CGPoint position;
        CTRunGetGlyphs(run, thisGlyphRange, &glyph);
        CTRunGetPositions(run, thisGlyphRange, &position);

        CGPathRef letter = CTFontCreatePathForGlyph(runFont, glyph, NULL);
        CGAffineTransform t = CGAffineTransformMakeTranslation(position.x, position.y);
        CGPathAddPath(letters, &t, letter);
        CGPathRelease(letter);
    }
}

UIBezierPath *path = [UIBezierPath bezierPathWithCGPath:letters];
CGRect boundingBox = CGPathGetBoundingBox(letters);
CGPathRelease(letters);
CFRelease(line);

// The path is upside down (CG coordinate system)
[path applyTransform:CGAffineTransformMakeScale(1.0, -1.0)];
[path applyTransform:CGAffineTransformMakeTranslation(0.0, boundingBox.size.height)];

return path;

}

@end