用户对问题“用CGPaths和CAShapeLayers动画绘制字母”的回答

用CGPaths和CAShapeLayers动画绘制字母

var path = UIBezierPath()
    var unichars = [UniChar]("J".utf16)
    var glyphs = [CGGlyph](count: unichars.count, repeatedValue: 0)
    let gotGlyphs = CTFontGetGlyphsForCharacters(font, &unichars, &glyphs, unichars.count)
    if gotGlyphs {
        let cgpath = CTFontCreatePathForGlyph(font, glyphs[0], nil)
         path = UIBezierPath(CGPath: cgpath!)
    }

 let layer = CAShapeLayer()
   layer.position = //CGPoint
    layer.bounds = //CGRect()
    view.layer.addSublayer(layer)
    layer.path = path.CGPath
    layer.lineWidth = 5.0
    layer.strokeColor = UIColor.blackColor().CGColor
    layer.fillColor = UIColor.clearColor().CGColor
    layer.geometryFlipped = true
    layer.strokeStart = 0.0
    layer.strokeEnd = 1.0
    let anim = CABasicAnimation(keyPath: "strokeEnd")
    anim.duration = 8.0
    anim.fromValue = 0.0
    anim.toValue = 1.0
    layer.addAnimation(anim, forKey: nil)

let word = "Test"
let path = UIBezierPath()
let spacing: CGFloat = 50
var i: CGFloat = 0
for letter in word.characters {
    let newPath = getPathForLetter(letter)
    let actualPathRect = CGPathGetBoundingBox(path.CGPath)
    let transform = CGAffineTransformMakeTranslation((CGRectGetWidth(actualPathRect) + min(i, 1)*spacing), 0)
    newPath.applyTransform(transform)
    path.appendPath(newPath)
}

func getPathForLetter(letter: Character) -> UIBezierPath {
    var path = UIBezierPath()
    let font = CTFontCreateWithName("HelveticaNeue", 64, nil)
    var unichars = [UniChar]("\(letter)".utf16)
    var glyphs = [CGGlyph](count: unichars.count, repeatedValue: 0)
    let gotGlyphs = CTFontGetGlyphsForCharacters(font, &unichars, &glyphs, unichars.count)
    if gotGlyphs {

用CGPaths和CAShapeLayers动画绘制字母

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