Multithreading compile issue [duplicate]

Question

I am write a subclass of UITableViewCell to loading some image from internet but when using dispatch_async it won't work imageUITableViewCell

class imageTableViewCell: UITableViewCell

private func updateCell() { dispatch_async(dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0)) { } }

error: cannot convert value of type 'qos_class_t' to expected argument type 'Int' fix-it replace "QOS_CLASS_USER_INITIATED" with Int(QOS_CLASS_USER_INITIATED)

can't figure out why,any idea will be appreciate

What wrong with that ? just replace it and then see what it wanted here! — Abhishek Mitra
– Abhishek Mitra, Commented Jun 1, 2017 at 13:35
You have to tell us more. What's not working? Do you have any error after or before compilation? Show some code. — Michał Kwiecień
– Michał Kwiecień, Commented Jun 1, 2017 at 13:40
@AbhishekMitra after replace four times it still won't compile and Xcode give up — jin
– jin, Commented Jun 1, 2017 at 13:48
@MichałKwiecień the code and compiler error are posted on picture just click the imageTableViewCell, I will post the text version asap — jin
– jin, Commented Jun 1, 2017 at 13:52

Michał Kwiecień · Accepted Answer · 2017-06-01 14:02:37Z

0

DispatchQueue.global(qos: .background).async { //fetch something DispatchQueue.main.async { //update UI } }

answered Jun 1, 2017 at 14:02

Michał Kwiecień

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brimstone Over a year ago

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