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Swift: How to create a background thread

Background Threads let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT dispatch_async(dispatch_get_global_queue(priority, 0)) {     // do...

Background Threads

let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
dispatch_async(dispatch_get_global_queue(priority, 0)) {
    // do some task

    dispatch_async(dispatch_get_main_queue()) {
        // update some UI

    }
}

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