CODEWITHSUNDEEP
objective-ccocoa
xanadu6291
xanadu6291

Reputation: 931

Application does not respond

I have a method which encodes selected songs on iTunes to mp3 using lame. Now I'm calling it from IBAction named "Encode". While encoding, Application fails into not responding state. And when encode is finished, Application come back. I would like to solve this not responding state. Would you teach me how should I approach?

Upvotes: 0

Views: 95

Answers (2)

Michael Knudsen
Michael Knudsen

Reputation: 629

You need to dispatch it on a thread different from the main thread. Otherwise it will block the main thread which is where the GUI part of your app runs.

Here is one example of how to do it. Be careful, though, if you want to modify variables outside the block. You might want to look up the __block keyword.

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{

    // INSERT CODE HERE

});

Upvotes: 1

tilo
tilo

Reputation: 14169

I guess you are doing the encoding on the main thread and this is why your application becomes unresponsive. You may want to read articles about threading and concurrency in order to solve your problem.

There is also an introduction on raywenderlich.com called "Multithreading and Grand Central Dispatch on iOS for Beginners Tutorial".

Upvotes: 3

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