Swift现实

笔者：fengsh998原文地址：http://blog.csdn.net/fengsh998/article/details/34540623转载请注明出处假设认为文章对你有所帮助，请通过留言或关注微信公众帐号fengsh998来支持我。谢谢！

swift学习也快有一个月了。文章也写了不少。今天来公布一个小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 中的具体信息中的内容，先显示一部分，点击很多其它时，再载入完毕。

眼下仅仅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。。。

。。

源代码：

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

效果：





当中这个“很多其它“的位置能够自行调整。当点击很多其它时，就会展示所有：



核心代码：

//more btn
func drawMoreInRect(moreRect:CGRect)
{
var ctx = UIGraphicsGetCurrentContext();
CGContextSaveGState(ctx);

var raduis = CGRectGetHeight(moreRect) / 2.0

var maxX = CGRectGetMaxX(moreRect)
var minX = CGRectGetMinX(moreRect)
var maxY = CGRectGetMaxY(moreRect)
var minY = CGRectGetMinY(moreRect)

CGContextMoveToPoint(ctx,minX,minY)
CGContextAddArcToPoint(ctx,maxX,minY,maxX,maxY,raduis)
CGContextAddArcToPoint(ctx,maxX,maxY,minX,maxY,raduis)
CGContextAddArcToPoint(ctx,minX,maxY,minX,minY,raduis)
CGContextAddArcToPoint(ctx,minX,minY,maxX,minY,raduis)

CGContextClosePath(ctx)
if selectedHightlight
{
CGContextSetRGBFillColor(ctx, 29/255.0, 158/255.0, 245/255.0, 1.0)
}
else
{
CGContextSetRGBFillColor(ctx, 104/255.0, 202/255.0, 248/255.0, 1.0)
}

CGContextDrawPath(ctx, kCGPathFill) //依据坐标绘制路径
CGContextRestoreGState(ctx)
}

override func drawRect(rect:CGRect)
{
var attributedString = NSMutableAttributedString(string: self.text)
let len = countElements(String(self.text))

let fname = self.font.fontName

//String convert to CFString
//let cfstr : CFString = reinterpretCast(fname.withCString(getenv))

let mfont = self.font

var attributes = NSMutableDictionary()

attributes.setObject(mfont,forKey:kCTFontAttributeName)

attributedString.addAttributes(attributes,range:NSMakeRange(0,len))

self.attributedText = attributedString;

var framesetter = CTFramesetterCreateWithAttributedString(attributedString)

var Path = CGPathCreateMutable()

var rectWidth = self.bounds.size.width

CGPathAddRect(Path, nil ,CGRectMake(0,0,rectWidth,CGFLOAT_MAX))

var frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0,0), Path, nil)

var rows = CTFrameGetLines(frame)

if let hasRows = rows?
{
//获取frame中的行数
var numberOfLines = CFArrayGetCount(rows)
//println("rows = \(numberOfLines)")

var fontLineHeight = self.font.lineHeight

var textOffset = self.font.ascender

var ctx = UIGraphicsGetCurrentContext()
CGContextSaveGState(ctx)
//距左上位置设置
CGContextTranslateCTM(ctx, 0, 0)
CGContextSetTextMatrix(ctx, CGAffineTransformMakeScale(1,-1))

for var lineNumber=0; lineNumber<numberOfLines; lineNumber++
{
var onlyline = CFArrayGetValueAtIndex(rows, lineNumber)
var flush : Double = 0.0

var onlycline :CTLine = reinterpretCast(onlyline)

var penOffset = 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
//var nums = CTLineGetGlyphCount(onlycline)
//println("本行的字符数\(nums)")

if let mp = morepoint
{
var posline = mp.row
var posclm = mp.column

var bool_lastline = (posline == numberOfLines - 1) ? true : false

if lineNumber == posline && !self.expand
{
var truncatedString = NSAttributedString(string: "\u2026")
var token = CTLineCreateWithAttributedString(truncatedString)

var range = CTLineGetStringRange(onlycline)
var maxlengthInline = range.length

posclm = min(posclm,maxlengthInline)

//获取onlycline中一黄有几个CTRun, 普通情况下。一行中仅仅有一个CTRun
var runs = CTLineGetGlyphRuns(onlycline)
var runsNums = CFArrayGetCount(runs)

var rw = 0.0
var rh = 0.0
var rowx = 0.0
var rowy = 0.0
if runsNums > 0
{
//将COpaquePointer 转为CTRun
var run :CTRun = reinterpretCast(CFArrayGetValueAtIndex(runs, 0))
//println("run = \(run)")
var runrange = CFRange(location: 0,length:(posclm == 0) ?

1 : posclm )
//println("runrange = \(runrange.length)")
var runsrect = 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
}

var newline = CTLineCreateTruncatedLine(onlycline, rw, CTLineTruncationType.End, token)
CTLineDraw(newline, ctx)

var linerect = CGRectMake(rowx,rowy,0,0)
if newline
{
linerect = CTLineGetImageBounds(newline,ctx)
}
//println("本行文字占的rect\(linerect)")

//rh = min(rh,16)
//rh = max(rh,10)
rh = 16.0

moreBtnRect = CGRectMake(linerect.origin.x,
linerect.origin.y - rh + 3,40,rh)

self.drawMoreInRect(moreBtnRect!)

var moretextrect = CGRectMake(moreBtnRect!.origin.x + rh/2+3, moreBtnRect!.origin.y+2,
moreBtnRect!.size.width - rh, moreBtnRect!.size.height)
var moretext : NSString = "很多其它"
moretext.drawInRect(moretextrect, withFont: UIFont.systemFontOfSize(10))

break
}
}

CTLineDraw(onlycline, ctx)

textOffset += fontLineHeight
}//end for

CGContextRestoreGState(ctx);

var contentRect = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.bounds.size.width, round(textOffset-self.font.ascender))

//println("contentRect = \(contentRect)")
if contentRect.size.height > self.bounds.size.height
{
dispatch_async(dispatch_get_main_queue(), {
self.viewFrameChangeBlock(self,contentRect)
})
}

}//end if
}