When I first wrote my simple program using in-app purchase (I did not rewrite this app from C to Swift) when the user selects a purchase from the view controller this calls a simple purchase routine. If there are purchases it will update the state of the view controller's buyButton to allow a purchase. It also updates the productTitle and productDescription.
This used to work, but with the newer Xcode I am not allowed to change the state of the button from within the thread: "Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread."
How do I enable the button then? Is using dispatch_async the correct solution?
Below is the routine that is called from the paymentQueue:
- (void) productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response{
NSArray *products = response.products;
NSLog(@"in productsRequest");
myProduct = products;
if (products.count != 0)
{ _product = products[0];
//THIS IS WHAT IS CAUSING THE ISSUE ******* buyButton.enabled = YES;
_productTitle.text = _product.localizedTitle;
_productDescription.text = _product.localizedDescription; }
else{
_productTitle.text = @"Product not found"; }
products = response.invalidProductIdentifiers;
for (SKProduct *product in products) { NSLog(@"Product not found: %@", product); } }
Should I be doing something like this for the UI changes:
dispatch_async(dispatch_get_main_queue(), ^{
self->buyButton.enabled = YES;
self->_productTitle.text = self->_product.localizedTitle;
self->_productDescription.text = self->_product.localizedDescription;
});
