CODEWITHSUNDEEP
iosswiftuiscrollviewuicollectionviewloading
Josip Bogdan
Josip Bogdan

Reputation: 588

Screen showing too slowly

I initialized my screen and all the elements in viewDid load, hidden them and set to reveal them after parsing JSON, I have a collectionView in a scrollView inside which I synchronically load elements that I dowloaded. Downloading and parsing JSON takes less than a sec, but for my screen to show up it takes a lot, but funny thing is when I try to scroll the screen it appears instantly, so I think that something is up with either scrollView or collectionView that I am not aware of. Anyone had a similar situation?

collectionView.dataSource = self is in the .hidden = false function

there is a lot of code, I am not sure that it would be very helpful.

Upvotes: 0

Views: 33

Answers (2)

Josip Bogdan
Josip Bogdan

Reputation: 588

for swift it worked by wraping the func that unhides the elements just after parsing JSON with: 

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
            dispatch_async(dispatch_get_main_queue()) {
                self.loadScreen()
            }
        })

thanx iremk for the objective c eqvivalent :)

Upvotes: 0

iremk
iremk

Reputation: 677

Try creating a new function to update your view's hidden elements and then call it like : 

[self performSelectorOnMainThread:@"your-selector" withObject:nil waitUntilDone:YES]

Because in async calls view updates won't be affective time-to-time.

I hope this helps!

Upvotes: 1

Related Questions