PDF文件未显示

Question

这是我的代码

func createPdfFromView(aView: UIView, saveToDocumentsWithFileName fileName: String)
{
    let pdfData = NSMutableData()
    UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil)
    UIGraphicsBeginPDFPage()

    guard let pdfContext = UIGraphicsGetCurrentContext() else { return }

    aView.layer.renderInContext(pdfContext)
    UIGraphicsEndPDFContext()

    if let documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first {
        let documentsFileName = documentDirectories + "/" + fileName
        print(documentsFileName)
        let saved = pdfData.writeToFile(documentsFileName, atomically: true)
        print("Saved \(saved)")
    }
}

它成功保存了我的文件。现在我想查看我的pdf文件。所以从app商店安装了adobe acrobat。 Adobe Acrobat应用程序未显示我的pdf文件。我想用adobe acrobat查看我的pdf