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

效果：

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 plain copy

1. //morebtn
2. funcdrawMoreInRect(moreRect:CGRect)
3. {
4. varctx=UIGraphicsGetCurrentContext();
5. CGContextSaveGState(ctx);
7. varraduis=CGRectGetHeight(moreRect)/2.0
8. varmaxX=CGRectGetMaxX(moreRect)
9. varminX=CGRectGetMinX(moreRect)
10. varmaxY=CGRectGetMaxY(moreRect)
11. varminY=CGRectGetMinY(moreRect)
13. CGContextMoveToPoint(ctx,minX,minY)
14. CGContextAddArcToPoint(ctx,maxX,minY,maxY,raduis)
15. CGContextAddArcToPoint(ctx,raduis)
16. CGContextClosePath(ctx)
17. ifselectedHightlight
18. {
19. CGContextSetRGBFillColor(ctx,29/255.0,158/255.0,245/255.0,1.0)
20. }
21. else
22. CGContextDrawPath(ctx,kCGPathFill)//根据坐标绘制路径
23. CGContextRestoreGState(ctx)
24. overridefuncdrawRect(rect:CGRect)
25. varattributedString=NSMutableAttributedString(string:self.text)
26. letlen=countElements(String(self.text))
27. letfname=self.font.fontName
28. //StringconverttoCFString
29. //letcfstr:CFString=reinterpretCast(fname.withCString(getenv))
30. letmfont=self.font
31. varattributes=NSMutableDictionary()
32. attributes.setObject(mfont,forKey:kCTFontAttributeName)
33. attributedString.addAttributes(attributes,range:NSMakeRange(0,len))
34. self.attributedText=attributedString;
35. varframesetter=CTFramesetterCreateWithAttributedString(attributedString)
36. varPath=CGPathCreateMutable()
37. varrectWidth=self.bounds.size.width
38. CGPathAddRect(Path,nil,CGRectMake(0,rectWidth,CGFLOAT_MAX))
39. varframe=CTFramesetterCreateFrame(framesetter,CFRangeMake(0,0),Path,nil)
40. varrows=CTFrameGetLines(frame)
41. iflethasRows=rows?
42. //获取frame中的行数
43. varnumberOfLines=CFArrayGetCount(rows)
44. //println("rows=\(numberOfLines)")
45. varfontLineHeight=self.font.lineHeight
46. vartextOffset=self.font.ascender
47. varctx=UIGraphicsGetCurrentContext()
48. CGContextSaveGState(ctx)
49. //距左上位置设置
50. CGContextTranslateCTM(ctx,0)
51. CGContextSetTextMatrix(ctx,CGAffineTransformMakeScale(1,-1))
52. forvarlineNumber=0;lineNumber<numberOfLines;lineNumber++
53. varonlyline=CFArrayGetValueAtIndex(rows,lineNumber)
54. varflush:Double=0.0
55. varonlycline:CTLine=reinterpretCast(onlyline)
56. varpenOffset=CTLineGetPenOffsetForFlush(onlycline,flush,rect.size.width)
57. CGContextSetTextPosition(ctx,penOffset,textOffset);
58. //println("第\(lineNumber)行\(onlycline)")
59. //获取第onlycline行中的字形数
60. //varnums=CTLineGetGlyphCount(onlycline)
61. //println("本行的字符数\(nums)")
62. ifletmp=morepoint
63. varposline=mp.row
64. varposclm=mp.column
65. varbool_lastline=(posline==numberOfLines-1)?true:false
66. iflineNumber==posline&&!self.expand
67. vartruncatedString=NSAttributedString(string:"\u2026")
68. vartoken=CTLineCreateWithAttributedString(truncatedString)
69. varrange=CTLineGetStringRange(onlycline)
70. varmaxlengthInline=range.length
71. posclm=min(posclm,maxlengthInline)
72. //获取onlycline中一黄有几个CTRun,一般情况下，一行中只有一个CTRun
73. varruns=CTLineGetGlyphRuns(onlycline)
74. varrunsNums=CFArrayGetCount(runs)
75. varrw=0.0
76. varrh=0.0
77. varrowx=0.0
78. varrowy=0.0
79. ifrunsNums>0
80. //将COpaquePointer转为CTRun
81. varrun:CTRun=reinterpretCast(CFArrayGetValueAtIndex(runs,0))
82. //println("run=\(run)")
83. varrunrange=CFRange(location:0,length:(posclm==0)?1:posclm)
84. //println("runrange=\(runrange.length)")
85. varrunsrect=CTRunGetImageBounds(run,ctx,runrange)
86. //println("runsrect=\(runsrect)")
87. rw=min(runsrect.size.width,rectWidth-40)
88. rh=runsrect.size.height
89. rowx=runsrect.origin.x
90. rowy=runsrect.origin.y
91. varnewline=CTLineCreateTruncatedLine(onlycline,rw,CTLineTruncationType.End,token)
92. CTLineDraw(newline,ctx)
93. varlinerect=CGRectMake(rowx,rowy,153); background-color:inherit; font-weight:bold">ifnewline
94. linerect=CTLineGetImageBounds(newline,ctx)
95. }
96. //println("本行文字占的rect\(linerect)")
97. //rh=min(rh,16)
98. //rh=max(rh,10)
99. rh=16.0
100. moreBtnRect=CGRectMake(linerect.origin.x,
101. linerect.origin.y-rh+3,40,rh)
102. self.drawMoreInRect(moreBtnRect!)
103. varmoretextrect=CGRectMake(moreBtnRect!.origin.x+rh/2+3,moreBtnRect!.origin.y+2,
104. moreBtnRect!.size.width-rh,moreBtnRect!.size.height)
105. varmoretext:NSString="更多"
106. moretext.drawInRect(moretextrect,withFont:UIFont.systemFontOfSize(10))
107. break
108. CTLineDraw(onlycline,248); line-height:18px; margin:0px!important; padding:0px 3px 0px 10px!important"> textOffset+=fontLineHeight
109. }//endfor
110. CGContextRestoreGState(ctx);
111. varcontentRect=CGRectMake(self.frame.origin.x,self.frame.origin.y,self.bounds.size.width,round(textOffset-self.font.ascender))
112. //println("contentRect=\(contentRect)")
113. ifcontentRect.size.height>self.bounds.size.height
114. dispatch_async(dispatch_get_main_queue(),{
115. self.viewFrameChangeBlock(self,contentRect)
116. })
117. //endif
118. }