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Last active September 10, 2016 14:55
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Swift 3 DispatchQueue
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DispatchQueue.md 
DispatchQueue.main.async {
    // execute in main thread
}


DispatchQueue.global(qos: .background).async {
    // execute in background thread
}


DispatchQueue.main.asyncAfter(deadline: .now() + 3, execute: {
    // wait three seconds
}
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