我想在用户输入数据后从textview生成pdf。 textview包含段落和归属文本。 我跟着了 this procedure
我的代码是：
func createPdf() {
createPDFNamed("test")
}
func getPDFPath(_ name: String) -> String {
let newPDFName = "\(name).pdf"
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
let documentsDirectory = paths[0]
let pdfPath: String = (documentsDirectory as String).appending(newPDFName);
print(pdfPath)
return pdfPath
}
func createPDFNamed(_ name: String) {
let text = myTextView.text
let currentText: CFAttributedString = CFAttributedStringCreate(nil, (text as CFString?), nil)
if currentText != nil {
let framesetter: CTFramesetter = CTFramesetterCreateWithAttributedString(currentText)
if framesetter != nil {
let pdfFileName: String = getPDFPath(name)
UIGraphicsBeginPDFContextToFile(pdfFileName, CGRect.zero, nil)
var currentRange: CFRange! = CFRangeMake(0, 0)
var currentPage: Int = 0
var done = false
repeat {
UIGraphicsBeginPDFPageWithInfo(CGRect(x: 0, y: 0, width: 612, height: 792), nil)
currentPage += 1
drawPageNbr(currentPage)
currentRange = renderPagewithTextRange(currentRange, andFramesetter: framesetter)
if currentRange.location == CFAttributedStringGetLength((currentText as? CFAttributedString)) {
done = true
}
} while !done
UIGraphicsEndPDFContext()
}
else {
print("Could not create the framesetter needed to lay out the atrributed string.")
}
}
else {
print("Could not create the attributed string for the framesetter")
}
}
func renderPagewithTextRange(_ currentRange: CFRange, andFramesetter framesetter: CTFramesetter) -> CFRange {
var currentRange: CFRange! = CFRangeMake(0, 0)
let currentContext: CGContext? = UIGraphicsGetCurrentContext()
currentContext?.textMatrix = .identity
let frameRect = CGRect(x: 72, y: 72, width: 468, height: 648)
let framePath: CGMutablePath = CGMutablePath()
framePath.addRect(frameRect, transform: .identity)
let frameRef: CTFrame = CTFramesetterCreateFrame(framesetter, currentRange, framePath, nil)
currentContext?.translateBy(x: 0, y: 792)
currentContext?.scaleBy(x: 1.0, y: -1.0)
CTFrameDraw(frameRef, currentContext!)
currentRange = CTFrameGetVisibleStringRange(frameRef)
currentRange.location += currentRange.length
currentRange.length = 0 as? CFIndex ?? CFIndex()
return currentRange
}
func drawPageNumber(_ pageNum: Int) {
let pageString = "Page \(Int(pageNum))"
let theFont = UIFont.systemFont(ofSize: 12)
let pageStringSize: CGSize = pageString.size(withAttributes: [.font: UIFont.systemFont(ofSize: 17.0)])
let stringRect = CGRect(x: ((612.0 - pageStringSize.width) / 2.0), y: 720.0 + ((72.0 - pageStringSize.height) / 2.0), width: pageStringSize.width, height: pageStringSize.height)
let paragraphStyle = NSParagraphStyle.default.mutableCopy() as? NSMutableParagraphStyle
paragraphStyle?.lineBreakMode = .byTruncatingTail
paragraphStyle?.alignment = .right
let attributes = [NSAttributedStringKey.font: theFont, .paragraphStyle: paragraphStyle as Any] as [NSAttributedStringKey : Any]
pageString.draw(in: stringRect, withAttributes: attributes)
}
pdf生成并且永远不会结束，即使它达到2Gb文件大小。但不是开放。你能否告诉我在完成pdf生成方面的错误？也是在pdf创建之后，想通过邮件发送 提前致谢
编辑：
如果我将代码更改为while done它会停止但只打印一页。如果我改为while !done，它会继续生成pdf。过去两天搜索并没有找到任何解决方案。此外，pdf仅打印黑色。我想将这些属性反映到pdf。任何建议。
if (currentRange.location == CFAttributedStringGetLength(currentText)){
done = true
}
} while done
UIGraphicsEndPDFContext()
}
else {
print("Could not create the framesetter needed to lay out the atrributed string.")
}
}
else {
print("Could not create the attributed string for the framesetter")
}
}