What's the best way to find the user's Documents directory on an iPhone?

问题

I'm reading Erica Sadun's iPhone Developer's Cookbook, and ran into a question.

She says in the book that the way to find the user's Documents directory is with the code:

[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];

but that seems slightly brittle, and dissimiliar to the normal Mac way of doing it, which would be:

NSSearchPathForDirectoriesInDomains(NSDocumentsDirectory, NSUserDomainMask, YES);

Are there any particular reasons to use one over the other?

回答1:

Objc:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)

Swift:

var paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)

You'll want the first element of the returned array.

回答2:

Here is the code that I use in my framework.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

回答3:

You should consider using the NSFileManager methods which return URLs, which are the preferred format.

let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as NSURL

This method is intended to locate known and common directories in the system.

An array of NSURL objects identifying the requested directories. The directories are ordered according to the order of the domain mask constants, with items in the user domain first and items in the system domain last.

回答4:

I use this

NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *zipLocalPath = [documentPath stringByAppendingString:fileName];

回答5:

In swift v3, I used the following snippet

var paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)

来源：https://stackoverflow.com/questions/272544/whats-the-best-way-to-find-the-users-documents-directory-on-an-iphone