您好我打开pdf从文件到imageview,然后在图像视图我丢了别针,之后我想再次保存为pdf但它没有保存在iphone上的文件中
我也试过以下解决方案
https://stackoverflow.com/a/45001576/10804348
这是我的代码
import UIKit
import PDFKit
class PreviewViewController: UIViewController {
@IBOutlet private weak var imageView: UIImageView!
var image: UIImage?
override func viewDidLoad() {
super.viewDidLoad()
let longP = UILongPressGestureRecognizer(target: self, action: #selector(longPressed(sender:)))
self.imageView.addGestureRecognizer(longP)
imageView.isUserInteractionEnabled = true
imageView.image = image
}
@objc func longPressed(sender: UILongPressGestureRecognizer) {
print("longpressed")
let touchPoint = sender.location(in: self.imageView)
let xPOint = touchPoint.x
let yPoint = touchPoint.y
let buble = UIImageView(frame: CGRect(x: xPOint, y: yPoint, width: 20, height: 20))
buble.image = UIImage(named: "Pin")
imageView.addSubview(buble)
}
func createPDF(image: UIImage) -> NSData? {
let pdfData = NSMutableData()
let pdfConsumer = CGDataConsumer(data: pdfData as CFMutableData)!
var mediaBox = CGRect.init(x: 0, y: 0, width: image.size.width, height: image.size.height)
let pdfContext = CGContext(consumer: pdfConsumer, mediaBox: &mediaBox, nil)!
pdfContext.beginPage(mediaBox: &mediaBox)
pdfContext.draw(image.cgImage!, in: mediaBox)
pdfContext.endPage()
return pdfData
}
@IBAction func btnSaveTapped(_ sender: UIButton) {
let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let docURL = documentDirectory.appendingPathComponent("myFileName.pdf")
createPDF(image: image!)?.write(to: docURL, atomically: true)
print("Saved")
}
}
但我仍然无法在设备文件中保存为pdf,这里我附加屏幕截图所以你可以很容易理解
所以请告诉我这是正确的方法或我做错了请告诉我
使用此代码在FileManager
成功保存pdf文件。
@IBAction func btnSaveTapped(_ sender: UIButton) {
let fileManager = FileManager.default
do {
let documentDirectory = try fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor:nil, create:false)
let docURL = documentDirectory.appendingPathComponent("myFileName.pdf")
let myImage = UIImage(named: "Screen1")
print(docURL)
createPDF(image: myImage!)?.write(to: docURL, atomically: true)
} catch {
print(error)
}
}
请参阅文件管理器中的已保存文件
按照此步骤在路径上显示文件(使用模拟器运行时)
输出路径打印如
文件:///Users/atulparmar/Library/Developer/CoreSimulator/Devices/D8012A46-71C3-4A99-8D81-31890208EF03/data/Containers/Data/Application/506B9D5A-9FB0-4865-8F14-D2DB27495B05/Documents/myFileName.pdf
打开Finder - >转到 - >转到文件夹..过去的路径如下(快捷键⇧⌘G)
〜/资源库/开发/ CoreSimulator /设备/ D8012A46-71C3-4A99-8D81-31890208EF03 /数据/集装箱/数据/应用/ 506B9D5A-9FB0-4865-8F14-D2DB27495B05 /文档/ myFileName.pdf
如果您使用真实设备运行,那么您可以检查代码,查看此帖子以检查文件是否存在于设备How to check if a file exists in the Documents directory in Swift?
要在点击保存按钮时获取imageView的上下文,您可以更新create pdf函数,以便在点击按钮时将imageview图层渲染为pdf上下文。生成的pdf包含图像以及您添加的引脚:
func createPDF() -> NSData? {
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, imageView.bounds, nil)
UIGraphicsBeginPDFPage()
let pdfContext = UIGraphicsGetCurrentContext()
imageView.layer.render(in: pdfContext!)
UIGraphicsEndPDFContext()
return pdfData
}