Loading annotations from url using background thread. Pins doesn't show before moving or scaling mapView

Question

I load annotations from url using background thread. Pins doesn\'t show before I move or scale mapView. How can I update my view?

My viewDidAppear

- (voi         


        

Answer 1

You are updating the UI from a non UI - Thread this will not work

You will have to call segments of code that update your ui inside the UIThread Block as following:

For example

[mapView removeAnnotations:annotationsOnMap];

must be called in UI-Thread

   dispatch_async(dispatch_get_main_queue(), ^{
        //Update UI if you have to
        [mapView removeAnnotations:annotationsOnMap];
    });

Please note that you have to call all your UI updates inside the main_queue thread

   dispatch_async(dispatch_get_main_queue(), ^{
        //All UI updating code must come here
    });