Parse Ios 8 File Selector

< p > the new iOS 8 file selector allows users to select files from the sandbox of an application by looking at other applications or storage providers that are compatible with iCloud functions.

This function will be the optional function of developers. They can decide whether to let other applications access their application files.

The only way for an application to find files outside its sandbox is the file selector, so users can always control whether to authorize access and edit documents, and manually select files (like plug-ins that must be activated by users).

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< p > file selector will be equipped with four different types of file operations: open, mobile, import and export.

According to apple, open and mobile is obviously different from traditional iOS file processing, because they will allow applications to access files from sandboxes of other applications, allowing users to edit files in one place without creating unnecessary copies.

This is a profound change in Apple's sandbox mode.

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< p > in real terms, this means that if developers support this function, Pages can edit the same file created by other word processing applications, or the third party iOS text editor can open and modify a TXT file created and stored in iCloud in Mac native text editor.

When Apple announced this function, developers were delighted.

For developers, one of the troublesome problems of iOS is data portability. Therefore, apple now releases data constraints, allowing access to the same file among applications, making progress for developers and users.

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Applications with < p > iOS 8 can also copy files to new paths without changing the source files.

The import and export modes mentioned above are similar to iOS's old mode in menu opening, but the improvement of iOS 7 no longer forces users to leave the application they are currently using.

The import and export mode will simply create copies to the inside or outside of the application, but will not involve any application switching.

Another advantage of the import and export mode is that applications that do not support iCloud document storage will be able to import files from iCloud supported applications to generate offline copies of files.

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In P > in the technical documentation of the beta, apple emphasizes that developers will have to consider the file management pattern they want in the a href= "http://? Www.sjfzxm.com/news/index_c.asp" > /a > application, because the user may not need all the functions, and the subtle differences between the import and export patterns may be confusing.

According to apple, most users want flexible document management operations, and developers should emphasize "simple import and export operations".

Moreover, even if application switching is reduced, the import and export mode will still create an extra copy of the file, consuming extra storage space and making it difficult to process individual documents in multiple applications.

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< p > at the WWDC developer seminar, Apple engineers pointed out that < a href= "http:// www.sjfzxm.com/news/index_c.asp" > iCloud Drive < /a > the possibility of editing files from other applications will make users happy and bring better user experience.

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< p > it is important to note that although file processing and file operations have changed, Apple has not abandoned sandbox mode or allowed blind entry into the sandbox of applications.

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< p > as mentioned above, the file selector will be the only way for users to access the documents outside the application sandbox, and also the only way for developers to set up the scope of their applications.

In addition, applications that access documents from external applications can not easily bypass the sandbox to access the file: instead, the application will store a reference to a file, including the safe range URL granted to file access.

The concept of URL with security range is not new. It is the same as Apple's OS X usage technology, and also allows applications to access files outside their sandbox.

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< p > all these measures emphasize that apple still supports the a href= "http:// www.sjfzxm.com/news/index_c.asp" > iOS /a > sandbox mode, but they are willing to give users more flexibility to adopt the technology they first developed for OS X, while giving the system a user-friendly interface.

In Apple's view, applications are still not widely accessible to other application databases, but document based iOS 8 applications will be able to use document selectors.

Therefore, although two word processors can collaboratively open and move a single text file, Twitter clients may not be able to access any photos or preferences stored in another social networking application.

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< p > the rules set up by apple for iOS 8 document processing are similar to the extended components: both parties have to go through specific activation points, and they will support not abandoning sandbox.

For documents, Apple has added some additional restrictions: applications will not be able to write new files outside their sandbox, and if one application attempts to open and move another document supporting iCloud Drive applications, iCloud support will be required.

For new files, you will not be able to open App A, and then create a new file directly in App B: if two applications support this function, App A will need to write the file to a temporary location and then move it to App B.

For end-users, the difference may be small, but it is important for developers.

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