DispatchQueue.init(label: , qos: , attributes: , autoreleaseFrequency: , target: )
How to write the parameters, I looked at the original notes for a long time，But I still can't write a serial queue
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What do you want to happen? – rbaldwin May 02 '18 at 07:49
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Did you manage to find the answer? – nr5 Oct 10 '18 at 11:30