IOS 图文新闻文章样式

//在实现图文混排的功能之前，首先往项目中添加一个继承自UIView 父类的子类CTImageView.swift。使用该类的draw方法，并在该方法中使 用Core Text框架渲染富文本， 1 let picWidth = CGFloat(200.0) 2 let picHeight = CGFloat(133.0) 3 UIColor.brown.setFill() 4 UIRectFill(rect) 5 var ctRunCallback = CTRunDelegateCallbacks(version： kCTRunDelegateVersion1, dealloc： { (refCon) -> Void in 6 }, getAscent：{ ( refCon) -> CGFloat in 7 return picHeight 8 }, getDescent：{ (refCon) -> CGFloat in 9 return 0 10 }) { (refCon) -> CGFloat in 11 return picWidth 12 } 13 var picture = “coffee “ 14 let ctRunDelegate = CTRunDelegateCreate(&ctRunCallback, &picture) 15 let placeHolder = NSMutableAttributedString(string：” “) 16 placeHolder.addAttribute(kCTRunDelegateAttributeName as String, value：ctRunDelegate！, range： NSMakeRange(0, 1)) 17 placeHolder.addAttribute(“pictureName”, value： picture, range：NSMakeRange(0, 1)) 18 let article = “咖啡（coffee）是采用经过烘焙的咖啡豆所 制作出来\n\n的饮料，通常为热饮，但也有 作为冷饮的冰咖啡。 咖啡是人类社会流行范围最为广泛的饮料之一，也是重要经济作 物。在繁忙的工作生活 之余，我们可以去尝试做自己的咖啡。” 19 let attributedStr = NSMutableAttributedString(string： article) 20 attributedStr.insert(placeHolder, at：27) 21 attributedStr.addAttribute(kCTUnderlineStyleAttributeName as String, value：NSNumber(value：1), range： NSRange(location：0, length：attributedStr.length)) 22 let framesetter = CTFramesetterCreateWithAttributedString(attributedStr) 23 let path = UIBezierPath(rect：rect) 24 let ctFrame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, attributedStr.length), path.cgPath, nil) 25 26 let crtContext = UIGraphicsGetCurrentContext() 27 crtContext！.textMatrix = CGAffineTransform.identity 28 crtContext？.scaleBy(x：1.0, y：-1.0) 29 crtContext？.translateBy(x：0, y： self.bounds.size.height * -1) 30 CTFrameDraw(ctFrame, crtContext！) 31 let ctLines = CTFrameGetLines(ctFrame) as NSArray 32 var originsOfLines = CGPoint 33 for _ in 0..<ctLines.count{ 34 originsOfLines.append(CGPoint.zero) 35 } 36 let range：CFRange = CFRangeMake(0, 0) 37 CTFrameGetLineOrigins(ctFrame, range, &originsOfLines) 38 for i in 0..<ctLines.count 39 { 40 let ctLineOrigin = originsOfLines[i] 41 let ctRuns = CTLineGetGlyphRuns(ctLines[i] as！ CTLine) as NSArray 42 43 for ctRun in ctRuns 44 { 45 let ctAttributes = CTRunGetAttributes(ctRun as！ CTRun) as NSDictionary 46 let pictureName = ctAttributes.object(forKey：“pictureName”) 47 if pictureName！= nil 48 { 49 let offset = CTLineGetOffsetForStringIndex(ctLines[i] as！CTLine, CTRunGetStringRange(ctRun as！ CTRun).location, nil) 50 let picturePosX = ctLineOrigin.x + offset 51 52 let pictureFrame = CGRect(x：picturePosX, y： ctLineOrigin.y, width：picWidth, height： picHeight) 53 let image = UIImage(named：pictureName as！String) 54 crtContext？.draw((image？.cgImage)！, in： pictureFrame) 55 } 56 } 57 }

//在viewcontrol.swift 1 let imageView = CTImageView() 2 imageView.frame = CGRect(x：20, y：80, width：280, height：280) 3 self.view.addSubview(imageView)