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我想用CGPDFContextCreateWithURL创建一个简单的pdf,但是当我显示PDF时它是空白的。我的代码:使用CGPDFContextCreateWithURL时PDF是空白页
我drawSuperPDF()函数
func drawSuperPDF(filename: String) {
let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
let pdfFileName = documentsURL.URLByAppendingPathComponent(filename)
let fullPath = pdfFileName.path!
let url = NSURL(fileURLWithPath: fullPath)
var mediaBox:CGRect = CGRectMake(0, 0, 612, 792)
let myPDFContext = CGPDFContextCreateWithURL(url, &mediaBox, nil)
drawHeaders()
CGPDFContextEndPage(myPDFContext)
}
我drawHeaders()和drawHeaderText()函数
func drawHeaders() {
drawHeaderText(CGPoint(x: 30, y: 10), headerText: "Hello World:", underline: true)
drawHeaderText(CGPoint(x: 30, y: 25), headerText: "Hello World:", underline: true)
drawHeaderText(CGPoint(x: 30, y: 40), headerText: "Hello World:", underline: true)
drawHeaderText(CGPoint(x: 30, y: 70), headerText: "Hello World:", underline: true)
}
func drawHeaderText(point: CGPoint, headerText: String, underline: Bool) {
let drawingPoint = CGPoint(x: point.x, y: point.y)
if underline {
var multipleAttributes = [String : NSObject]()
multipleAttributes[NSFontAttributeName] = UIFont.boldSystemFontOfSize(12)
multipleAttributes[NSUnderlineStyleAttributeName] = NSUnderlineStyle.StyleSingle.rawValue
headerText.drawAtPoint(drawingPoint,
withAttributes: multipleAttributes)
} else {
let font = UIFont.systemFontOfSize(12)
headerText.drawAtPoint(drawingPoint,
withAttributes: [NSFontAttributeName : font])}
}
最后,我showPDFFile()
func showPDFFile() {
let fileName = "test4.pdf"
let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
let pdfFileName = documentsURL.URLByAppendingPathComponent(fileName)
let fullPath = pdfFileName.path!
let webView : UIWebView = UIWebView(frame: CGRectMake(0, 0, self.view.frame.width, self.view.frame.height))
let url : NSURL = NSURL(fileURLWithPath: fullPath)
let request : NSURLRequest = NSURLRequest(URL: url)
webView.scalesPageToFit = true
webView.loadRequest(request)
self.view.addSubview(webView)
}
您正在调用“CGPDFContextEndPage”,但不是BeginPage调用。如果在开始绘制页面之前没有必要,我会很惊讶。 –
感谢David,我添加了CGPDFContextBeginPage(myPDFContext,零) ,现在我可以使用核心图形绘制简单的图形,但无法绘制文本 - 非常令人沮丧。 – Tom
:)不能拥有一切。我会把它写成答案。请批准它为正确的,并提出一个新的问题的文字,可能是你做错了文本调用,但应该很容易发现。 –