nsoperation

Wait until swift for loop with asynchronous network requests finishes executing

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I would like a for in loop to send off a bunch of network requests to firebase, then pass the data to a new view controller once the the method finishes executing. Here is my code: var datesArray = [String: AnyObject]() for key in locationsArray { let ref = Firebase(url: “http://myfirebase.com/” + “\(key.0)”) ref.observeSingleEventOfType(.Value, withBlock: … Read more

NSOperation vs Grand Central Dispatch

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I’m learning about concurrent programming for iOS. So far I’ve read about NSOperation/NSOperationQueue and GCD. What are the reasons for using NSOperationQueue over GCD and vice versa? Sounds like both GCD and NSOperationQueue abstract away the explicit creation of NSThreads from the user. However the relationship between the two approaches isn’t clear to me so … Read more