问题
The Situation
In my app, I am currently downloading an mp3 file (to docs directory) using [NSData dataWithContentsOfURL:URL], a method that works fine, but ties down the CPU, dissallowing screen updates of download status. So, I want to download using a different method so that I can update the screen WHILE downloading to alert the user that the download has begun.
Question
How do I set up my viewController to use NSURLRequest or NSURLConnection to download an mp3 file? (please give source)
回答1:
Use "NSURLConnection asynchronously" search for the term and you'll find source. Or just NSURLConnection.
For example:
NSURLConnection NSURLRequest proxy for asynchronous web service calls
来源：https://stackoverflow.com/questions/2204010/how-to-use-nsurlrequest-nsurlconnection-to-download-an-mp3-file-to-app