文件选择用遇到的坑

简介

iOS8.0+之后有开放了对共享目录的文件浏览编辑等操作

• UIDocumentPickerViewController ios8.0+
• UIDocumentBrowserViewController ios11.0+ 两种方式。

UIDocumentPickerViewController

//
init(documentTypes allowedUTIs: [String], in mode: UIDocumentPickerMode)

• UIDocumentPickerMode

import //复制导入沙盒中
open //共享目录打开
exportToService
moveToService

官方给的文档说直接首前两个。

• documentTypes
  所以支持的类型，这里是官方地址

 let vc = UIDocumentPickerViewController(documentTypes: ["public.content","public.text"], in: .open)
         vc.delegate = self
            vc.modalPresentationStyle = .fullScreen
            vc.allowsMultipleSelection = true//ios11之后 加入多选功能
            self.present(vc, animated: true, completion: nil)

* 此处必须是present方法 如果navigationController?.pushViewController(vc, animated: true) 选中文件不会出发代理事件，不知原因，这是我遇到的一个坑。

• UIDocumentPickerDelegate

• documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL)
  ios8.0 ios11废弃
• documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL])
  iOS11.0+ 选中文件后，文件的地址。

*需要注意的是，URL的权限不能直接访问共享文件的内容，需要申请权限，操作完成释放权限

• url.tartAccessingSecurityScopedResource() 申请权限，BOOL
• url.stopAccessingSecurityScopedResource() 释放

UIDocumentBrowserViewController

实例化的方法基本一样

 let vc = UIDocumentBrowserViewController(forOpeningFilesWithContentTypes: ["public.content","public.text","public.source-code","public.image","public.audiovisual-content","com.adobe.pdf","com.apple.keynote.key","com.microsoft.word.doc","com.microsoft.excel.xls","com.microsoft.powerpoint.ppt"])
            
            vc.modalPresentationStyle = .fullScreen
            vc.delegate = self
            navigationController?.pushViewController(vc, animated: true)

代理相对简单 就不多做说明了

UIDocumentPickerViewController遇到了一个坑，目前还没有解决：同样的代码，Dome中显示正常，项目中，导航栏的返回图标于返回文字重叠。