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我想动态创建一个pdf。但是我有新页面的问题。

目前我正在编写一个文本块，如果该文本块不适合剩余的 Y 位置 - 我将整个文本块写在新页面上。但我想获取整个文本块，尽可能多地写入实际页面，然后将其余部分写在新页面上。有人知道如何根据矩形大小将文本拆分为矩形吗？

这就是代码： writeString ist 来自 CoreData 并且具有动态长度。

    func drawTextBlock(pdfFileName: String, writeString: NSString = " ", fontSize: CGFloat = 12.0, fontName: String = "Helvetica", textAlignment: NSTextAlignment = NSTextAlignment.Natural) {

    //Text attribute configuration
    let font = UIFont(name: fontName, size: fontSize)

    let textStyle = NSMutableParagraphStyle.defaultParagraphStyle().mutableCopy() as! NSMutableParagraphStyle
    textStyle.alignment = textAlignment

    let textFontAttributes = [
        NSFontAttributeName: font!,
        NSParagraphStyleAttributeName: textStyle
    ]
    let textSize = writeString.sizeWithAttributes(textFontAttributes)

    let linesNeeded = ceil(textSize.width / (myPageCalibration.pageWidth  - myPageCalibration.xOffsetLeft - myPageCalibration.xOffsetRight))


    if remainingSpaceY >= (textSize.height * linesNeeded) {
        //draw text in rectangle
        writeString.drawInRect(CGRectMake(myPageCalibration.xOffsetLeft, myPageCalibration.yOffsetUp + currentPositionY, myPageCalibration.pageWidth - myPageCalibration.xOffsetLeft - myPageCalibration.xOffsetRight, (textSize.height * linesNeeded )), withAttributes: textFontAttributes)

        //calc remainingSpace
        currentPositionY = CGFloat(linesNeeded * textSize.height) + currentPositionY
        remainingSpaceY = remainingSpaceY - (textSize.height * linesNeeded)
    }
    else {
        //next page
        UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 595, 842), nil);
        remainingSpaceY = myPageCalibration.pageHeight - myPageCalibration.yOffsetDown - myPageCalibration.yOffsetUp
        currentPositionY = 0

        drawTextBlock(pdfFileName, writeString: writeString, fontSize: fontSize, fontName: fontName, textAlignment: textAlignment)
    }
}
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