我是 iOS 新手。如何让我成为一个遵循字母“B”的 UIBezierPath。目标是沿着这条路径跟踪触摸。
提前致谢。
最佳答案
CoreText.framework提供获取word路径的方法
参见 http://www.codeproject.com/Articles/109729/Low-level-text-rendering
Ole Begemann 创建的代码示例。抱歉,我忘记了名为 AnimatedPath 的演示的下载地址。
CGMutablePathRef letters = CGPathCreateMutable();
CTFontRef font = CTFontCreateWithName(CFSTR("Helvetica-Bold"), 72.0f, NULL);
NSDictionary *attrs = [NSDictionary dictionaryWithObjectsAndKeys:
(id)font, kCTFontAttributeName,
nil];
NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:@"Hello World!"
attributes:attrs];
CTLineRef line = CTLineCreateWithAttributedString((CFAttributedStringRef)attrString);
CFArrayRef runArray = CTLineGetGlyphRuns(line);
// for each RUN
for (CFIndex runIndex = 0; runIndex < CFArrayGetCount(runArray); runIndex++)
{
// Get FONT for this run
CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, runIndex);
CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName);
// for each GLYPH in run
for (CFIndex runGlyphIndex = 0; runGlyphIndex < CTRunGetGlyphCount(run); runGlyphIndex++)
{
// get Glyph & Glyph-data
CFRange thisGlyphRange = CFRangeMake(runGlyphIndex, 1);
CGGlyph glyph;
CGPoint position;
CTRunGetGlyphs(run, thisGlyphRange, &glyph);
CTRunGetPositions(run, thisGlyphRange, &position);
// Get PATH of outline
{
CGPathRef letter = CTFontCreatePathForGlyph(runFont, glyph, NULL);
CGAffineTransform t = CGAffineTransformMakeTranslation(position.x, position.y);
CGPathAddPath(letters, &t, letter);
CGPathRelease(letter);
}
}
}
CFRelease(line);
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointZero];
[path appendPath:[UIBezierPath bezierPathWithCGPath:letters]];
CGPathRelease(letters);
CFRelease(font);
替换“Hello World!”与“你需要的词”。
关于遵循字体形状的 iOS UIBezierPath,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10599355/