Async Block in Objective-C
Run an operation on the background then update the main UI thread.
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
//do your work in the background here
dispatch_async(dispatch_get_main_queue(), ^{
//tell the main UI thread here
});
});Written by Raúl Raja
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