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In iOS basically we perform the background thread operation using GCD & OPeration, OPerationQueue.
In GCD there is DispatchGroup for handling the work is completed or not (different DispatchWorkItem ). In Operation, there is no kind of facility for this we have to create KVO
to manage all things. here we have taken the example of 2 Operation each Operation is downloading the image.
Please follow these steps:
Notes: It will add all the operations in the queue.
Note: here op1 & op2 is separate completion of the operation.
Write this code in your class.
Now: Here we have implemented KVO to check whether the Queue contains operation or not.
Complete Code :
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