TextPath-Swift

gistfile1.txt

func p_setupTextLayer(text: String) -> CAShapeLayer {
        var letters = CGPathCreateMutable()
        
        let font = CTFontCreateWithName("Helvetica-Bold", 72, nil)
        let attrs = [kCTFontAttributeName: font]
        var attrString = NSAttributedString(string: text, attributes: attrs)
        let line = CTLineCreateWithAttributedString(attrString)
        let runArray = CTLineGetGlyphRuns(line)
        
        
        var run: CTRun = reinterpretCast(CFArrayGetValueAtIndex(runArray, 0))
        
        
        var runFont: CTFont = reinterpretCast(CFDictionaryGetValue(CTRunGetAttributes(run), reinterpretCast(kCTFontAttributeName)))
        
        for runGlyphIndex in 0 ..< CTRunGetGlyphCount(run){
            var thisGlyphRange = CFRangeMake(runGlyphIndex, 1)
            var glyph = CGGlyph()
            var position = CGPointZero
            
            CTRunGetGlyphs(run, thisGlyphRange, &glyph)
            CTRunGetPositions(run, thisGlyphRange, &position)
            
            
            let letter = CTFontCreatePathForGlyph(runFont, glyph, nil)
            var t = CGAffineTransformMakeTranslation(position.x, position.y)
            
            CGPathAddPath(letters, &t, letter);
        }
        
        var path = UIBezierPath()
        path.moveToPoint(CGPointZero)
        path.appendPath(UIBezierPath(CGPath: letters))
        
        
        let layer = CAShapeLayer()
        layer.frame = CGRectMake(10, 10, 180, 100)
        layer.backgroundColor = nil
        layer.geometryFlipped = true
        layer.path = path.CGPath
        layer.strokeColor = UIColor.whiteColor().CGColor
        layer.fillColor = nil
        layer.lineWidth = 3.0
        layer.lineJoin = kCALineJoinBevel
        
        return layer
    }