Swift实战

swift学习也快有一个月了。文章也写了不少。今天来发布一个小ＤＥＭＯ。当操刀练手了。

主要写一个小控件，实现功能是类拟IPHONE手机打开AppStore 中的详细信息中的内容，先显示一部分，点击更多时，再加载完成。

目前只对单文本字体作处理，对于富文本的并不行。因此作为swift的操刀之作，还算是处女作吧。。。。。

源码：

整个控件的源码在:http://download.csdn.net/detail/fengsh998/7552229

其中这个“更多“的位置可以自行调整，当点击更多时，就会展示全部：

核心代码：

[cpp]view plaincopy 
   
 //morebtn
 funcdrawMoreInRect(moreRect:CGRect)
 {
 varctx=UIGraphicsGetCurrentContext();
 CGContextSaveGState(ctx);
 
 varraduis=CGRectGetHeight(moreRect)/2.0
 varmaxX=CGRectGetMaxX(moreRect)
 varminX=CGRectGetMinX(moreRect)
 varmaxY=CGRectGetMaxY(moreRect)
 varminY=CGRectGetMinY(moreRect)
 
 CGContextMoveToPoint(ctx,minX,minY)
 CGContextAddArcToPoint(ctx,maxX,minY,maxY,raduis)
 CGContextAddArcToPoint(ctx,raduis)
 
  @H_502_101@ CGContextClosePath(ctx) ifselectedHightlight
 {
 CGContextSetRGBFillColor(ctx,29/255.0,158/255.0,245/255.0,1.0)
 }
else
 CGContextDrawPath(ctx,kCGPathFill)//根据坐标绘制路径
 CGContextRestoreGState(ctx)
 overridefuncdrawRect(rect:CGRect)
 
  @H_502_101@ varattributedString=NSMutableAttributedString(string:self.text) letlen=countElements(String(self.text))
 letfname=self.font.fontName
//StringconverttoCFString
 //letcfstr:CFString=reinterpretCast(fname.withCString(getenv))
 
  @H_502_101@ letmfont=self.font 
  @H_502_101@ varattributes=NSMutableDictionary() 
  @H_502_101@ attributes.setObject(mfont,forKey:kCTFontAttributeName) 
  @H_502_101@ attributedString.addAttributes(attributes,range:NSMakeRange(0,len)) 
  @H_502_101@ self.attributedText=attributedString; 
  @H_502_101@ varframesetter=CTFramesetterCreateWithAttributedString(attributedString) 
  @H_502_101@ varPath=CGPathCreateMutable() 
  @H_502_101@ varrectWidth=self.bounds.size.width 
  @H_502_101@ CGPathAddRect(Path,nil,CGRectMake(0,rectWidth,CGFLOAT_MAX)) 
  @H_502_101@ varframe=CTFramesetterCreateFrame(framesetter,CFRangeMake(0,0),Path,nil) 
  @H_502_101@ varrows=CTFrameGetLines(frame) 
  @H_502_101@ iflethasRows=rows?//获取frame中的行数
 varnumberOfLines=CFArrayGetCount(rows)
//println("rows=\(numberOfLines)")
 
  @H_502_101@ varfontLineHeight=self.font.lineHeight 
  @H_502_101@ vartextOffset=self.font.ascender 
  @H_502_101@ varctx=UIGraphicsGetCurrentContext() CGContextSaveGState(ctx)
//距左上位置设置
 CGContextTranslateCTM(ctx,0)
 CGContextSetTextMatrix(ctx,CGAffineTransformMakeScale(1,-1))
forvarlineNumber=0;lineNumber<numberOfLines;lineNumber++
 
  @H_502_101@ varonlyline=CFArrayGetValueAtIndex(rows,lineNumber) varflush:Double=0.0
 varonlycline:CTLine=reinterpretCast(onlyline)
 varpenOffset=CTLineGetPenOffsetForFlush(onlycline,flush,rect.size.width)
 CGContextSetTextPosition(ctx,penOffset,textOffset);
//println("第\(lineNumber)行\(onlycline)")
//获取第onlycline行中的字形数
//varnums=CTLineGetGlyphCount(onlycline)
//println("本行的字符数\(nums)")
ifletmp=morepoint
 
  @H_502_101@ varposline=mp.row varposclm=mp.column
 varbool_lastline=(posline==numberOfLines-1)?true:false
iflineNumber==posline&&!self.expand
 vartruncatedString=NSAttributedString(string:"\u2026")
 vartoken=CTLineCreateWithAttributedString(truncatedString)
 
  @H_502_101@ varrange=CTLineGetStringRange(onlycline) varmaxlengthInline=range.length
 posclm=min(posclm,maxlengthInline)
//获取onlycline中一黄有几个CTRun,一般情况下，一行中只有一个CTRun
 varruns=CTLineGetGlyphRuns(onlycline)
 varrunsNums=CFArrayGetCount(runs)
 varrw=0.0
 varrh=0.0
 varrowx=0.0
 varrowy=0.0
ifrunsNums>0
//将COpaquePointer转为CTRun
 varrun:CTRun=reinterpretCast(CFArrayGetValueAtIndex(runs,0))
//println("run=\(run)")
 varrunrange=CFRange(location:0,length:(posclm==0)?1:posclm)
//println("runrange=\(runrange.length)")
 varrunsrect=CTRunGetImageBounds(run,ctx,runrange)
//println("runsrect=\(runsrect)")
 rw=min(runsrect.size.width,rectWidth-40)
 rh=runsrect.size.height
 rowx=runsrect.origin.x
 rowy=runsrect.origin.y
 varnewline=CTLineCreateTruncatedLine(onlycline,rw,CTLineTruncationType.End,token)
 CTLineDraw(newline,ctx)
 varlinerect=CGRectMake(rowx,rowy,153); background-color:inherit; font-weight:bold">ifnewline
 
  @H_502_101@ linerect=CTLineGetImageBounds(newline,ctx) }
//println("本行文字占的rect\(linerect)")
//rh=min(rh,16)
//rh=max(rh,10)
 rh=16.0
 
  @H_502_101@ moreBtnRect=CGRectMake(linerect.origin.x, linerect.origin.y-rh+3,40,rh)
 self.drawMoreInRect(moreBtnRect!)
 varmoretextrect=CGRectMake(moreBtnRect!.origin.x+rh/2+3,moreBtnRect!.origin.y+2,
 moreBtnRect!.size.width-rh,moreBtnRect!.size.height)
 varmoretext:NSString="更多"
 moretext.drawInRect(moretextrect,withFont:UIFont.systemFontOfSize(10))
break
 
  @H_502_101@ CTLineDraw(onlycline,248); line-height:18px; margin:0px!important; padding:0px 3px 0px 10px!important"> textOffset+=fontLineHeight }//endfor
 CGContextRestoreGState(ctx);
 varcontentRect=CGRectMake(self.frame.origin.x,self.frame.origin.y,self.bounds.size.width,round(textOffset-self.font.ascender))
//println("contentRect=\(contentRect)")
ifcontentRect.size.height>self.bounds.size.height
 
  @H_502_101@ dispatch_async(dispatch_get_main_queue(),{ self.viewFrameChangeBlock(self,contentRect)
 })
//endif
 }

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