Use GCD to concurrently download multiple images
A demo that includes a thread-safe singleton object used to concurrently download multiple images from Unsplash Source
Techniques/Frameworks used:
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GCD - sync/async concurrent
DispatchQueue
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GCD - async barrier
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GCD -
DispatchGroup
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GCD - async main queue and
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URLSession
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NotificaionCenter
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UICollectionTableViewController
,UITableViewController
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CALayer