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POios UIAlertView: make alert wait for my response
 

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  1. POios UIAlertView: make alert wait for my response
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/3753154/make-uialertview-blocking">Make UIAlertView blocking</a> </p> </blockquote> <p>Been beating my head against the wall for hours on this one. </p> <p>Here's what I've got: OrderDetailsViewController is set as an UIAlertViewDelegate</p> <p>I've got a procedure that receives information back from a search form. It checks to see if the item is already on the order and if not continues adding the item(s). If it sees a duplicate, it pops up a UIAlertView asking what the user wants to do: there are 3 options, "Combine" - add the new qty to the old item, "Add" the duplicate as a separate line item, or "Cancel" throw the new item away. I need it to wait for an answer from the UIAlertView so that I can continue adding the dupe or throwing away the dupe -- the "Combine" is handled in the delegate, but I still need an answer for the main procedure.</p> <p>Here's what I have so far:</p> <pre><code> - (void)returnItemAndQty:(ProductsSearchController *)productsSearchController withItemsToAdd:(NSMutableArray *)itemsToAdd withQty:(NSDictionary *)qtyToAdd andClose:(BOOL)close { if ([itemsToAdd count] == 0) { return; } Items *items; for (int index = 0; index &lt; [itemsToAdd count]; index++) { items = [itemsToAdd objectAtIndex:index]; qtyAddedToOrder = [NSDecimalNumber decimalNumberWithString:[qtyToAdd objectForKey:items.ItemCode]]; NSLog(@"Item Code: %@", items.ItemCode); NSLog(@"Qty: %@", [qtyToAdd objectForKey:items.ItemCode]); NSError *error; //For handling duplicate items. . . duplicateItemDisposition = -1; //Reset the dispostion for normal operation if([self isItemOnOrder:items.ItemCode]) { int i = [self itemIsAlreadyOnOrder:itemAlreadyOnOrder withQty:qtyAddedToOrder]; if (i == COMBINE || i == CANCEL){ //either Cancel or Combine was pressed. items.Checked = NO; if (![items.managedObjectContext save:&amp;error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); } continue; } } //Add the new item or duplicate if that's what you want OrdersDetails *newOrderDetail = [NSEntityDescription insertNewObjectForEntityForName:@"OrdersDetails" inManagedObjectContext:self.managedObjectContext]; .//more code snipped, that handles the "ADD" or non-dupe . . </code></pre> <p>Here's where it tests for a duplicate. . .</p> <pre><code>- (BOOL)isItemOnOrder:(NSString *)itemCode { NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"OrdersDetails" inManagedObjectContext:managedObjectContext]; [request setEntity:entity]; NSSortDescriptor *sort = [[NSSortDescriptor alloc]initWithKey:@"Desc1" ascending:NO]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sort, nil]; [request setSortDescriptors:sortDescriptors]; [sort release]; [sortDescriptors release]; NSPredicate *pred = [NSPredicate predicateWithFormat:@"(ItemCode=%@ AND OrderID=%@)", itemCode, orders.OrderID]; [request setPredicate:pred]; NSError *error; NSMutableArray *mutableFetchResults = [[managedObjectContext executeFetchRequest:request error:&amp; error] mutableCopy]; [request release]; if (mutableFetchResults == nil) { itemAlreadyOnOrder = nil; return NO; }else if ([mutableFetchResults count] &gt; 0){ itemAlreadyOnOrder = [mutableFetchResults objectAtIndex:0]; return YES; }else{ itemAlreadyOnOrder = nil; return NO; } } </code></pre> <p>Here's where it sees that a dupe exists and the UIAlertview delegate with it. . .</p> <pre><code>- (int) itemIsAlreadyOnOrder:(OrdersDetails *)existingOrderDetail withQty:(NSDecimalNumber *)qty { if (existingOrderDetail == nil) { return -1; } UIAlertView *duplicateAlert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"Duplicate Item %@ found.",existingOrderDetail.ItemCode] message:@"Tap Combine to combine the items, Tap Add to add the duplicate item or Tap Cancel to discard the duplicate" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Combine", @"Add", nil]; [duplicateAlert show]; return duplicateItemDisposition; [duplicateAlert release]; } - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { // Cancel = 0, Combine = 1, Add = 2 if (buttonIndex == CANCEL){ duplicateItemDisposition = CANCEL; }else if (buttonIndex == COMBINE){ duplicateItemDisposition = COMBINE; NSDecimalNumber *existingQty = [[NSDecimalNumber alloc] initWithDecimal:[itemAlreadyOnOrder.Qty decimalValue]]; NSDecimalNumber *existingPrice = itemAlreadyOnOrder.Price; NSDecimalNumber *newQty = [existingQty decimalNumberByAdding:qtyAddedToOrder]; itemAlreadyOnOrder.ExtPrice = [newQty decimalNumberByMultiplyingBy:existingPrice]; [existingQty release]; NSError *error; if (![itemAlreadyOnOrder.managedObjectContext save:&amp;error]){ NSLog(@"Error saving. %@, %@", error, [error userInfo]); [self handleFreeGoods:itemAlreadyOnOrder]; }else if (buttonIndex == ADD){ duplicateItemDisposition = ADD; } } </code></pre> <p>Now I read something on here about using an NSCondition in a background thread, but I have no idea what that means. I looked up NSCondition, and it was less than enlightening. </p> <p>Any ideas on how to pause the execution?</p>
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    1. USAlan Carter
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    1. COAre you performing some work on an NSOperation or some other method of background execution? What is it you're trying to 'pause'?
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    2. COI am not. I am basically just trying to get the code to wait for a response from UIAlertView before continuing on. I am not using any background execution or multi-threading.
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      1. USAlan Carter
 

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