CODEWITHSUNDEEP
objective-cfor-loopnsmutablearray
sharkyenergy
sharkyenergy

Reputation: 4183

good solution to store a specific list of values?

I use following code to retrive the upload order of files. The files must be uploaded in this specific order and cannot be uploaded simultaneously. Therefor I cannot put my code in this for-loop because it would hang the thread. 

    NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"order" ascending:YES];
NSArray *sortedArray = [agenciescontroller.arrangedObjects sortedArrayUsingDescriptors:[NSArray arrayWithObject:sort]];

for (NSManagedObject *a in sortedArray)
{
    for (NSMutableDictionary *d in imagescontroller.arrangedObjects)
    {
        if ([[NSString stringWithFormat:@"%@",[d valueForKey:[a valueForKey:@"agency"]]] isEqualToString: @"1"])
        {

            ///////////////////////////UPLOAD FILES HERE/////////////////////////////
            checkedchecks += 1;
            NSLog(@"Uploading %@ to %@", [d valueForKey:@"filename"], [a valueForKey:@"agency"]);
        }
    }
}

My idea was to use this for loop to populate a NSMutableArray or NSMutableDictionaries holding the precise list of files to upload and then go trough this list one by one. Is this a wise idea or is there a better solution? Also keep in mind that once the file is uploaded, I have to update a value inside the mutable dictionary in the foor loop. Where I check for a value = "1" that specific value has to be set to 0 once the upload is finished.

Upvotes: 0

Views: 54

Answers (1)

anon
anon

Reputation:

Use a NSOperationQueue where you set the maxConcurrentOperationCount property to 1. Then add one NSOperation per upload in your existing loop.

To update the value in your dictionary you can add a completion block to your NSOperation objects. Just make sure to use the necessary synchronization when updating the value since the completion block will run on some background thread.

Upvotes: 1

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