Checking for success/failure in NSURLSession completion handlers
Checking for success/failure in NSURLSession completion handlers
- Subject: Checking for success/failure in NSURLSession completion handlers
- From: Daryle Walker <email@hidden>
- Date: Mon, 30 Mar 2015 02:54:21 -0400
This is inspired by me incorrectly checking the result of NSFileManager's "- moveItemAtURL: toURL: error:” method. This call is within a block function in a call of NSURLSession’s "- downloadTaskWithURL: completionHandler:”. Said completion handler has a prototype of "void (^)(NSURL *location, NSURLResponse *response, NSError*error)”. Am I supposed to check for success by seeing whether or not “error” is nil, or if whether or not “location” (and/or “response”) is NOT nil?
Unlike some older APIs, NSURLSession’s method arguments that are block pointers do not have those inner functions’ parameters and/or return values fully explained. The URL Loading System Programming Guide does not explain what’s expected of those blocks either. File a bug?
—
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT mac DOT com
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