objective-c-blocks

I am using the CoreLocation's geocoder to get the CLLocation coordinates for multiple map items. The geocoder calls a completion block on completion for each item. How do I create a similar block functionality which is called when all of these containing asynchronous geocoder calls have been completed? (I could use a manual counter. But there must be a more elegant solution) Here's my geocoding function so far. It loops through an array of location items and starts a new geocoding process for each. -(void)geoCodeAllItems { for (EventItem* thisEvent in [[EventItemStore sharedStore] allItems]) {

I'm new to ARC. I want to call a method in a complete block, but I get the warning: Capturing 'self' strongly in this block is likely to lead to a retain cycle. . Code: - (void) handlerComplete { //... } - (void) loadData { ... operation.completeBlock = ^(NSInteger index) { [self handlerComplete]; }; } Any advice? Thanks. Try with - (void) loadData { __weak MyClassType *myClass = self; operation.completeBlock = ^(NSInteger index) { [myClass handlerComplete]; }; } Make a weak reference instead: operation.completeBlock = ^(NSInteger index) { __weak Foo *bar = self; [bar handlerComplete]; }; I

Normally blocks can be of 3 types: NSGlobalBlock, NSStackBlock, NSMallocBlock. Lets take the following example: void (^aBlock)(NSString *someString) = ^(NSString *someString){ NSLog(@"Block was executed. %@", someString); }; NSDictionary *dictionary = [NSDictionary dictionaryWithObject:aBlock forKey:@"aBlock"]; Because aBlock doesn't capture surrounding scope if I do po dictionary I get aBlock = < NSGlobalBlock :0x165dde60> and this is correct If I then do a: NSString *string = @"Test"; void (^aBlock)(NSString *someString) = ^(NSString *someString){ NSLog(@"Block was executed. %@ %@",

This question already has an answer here : Closed 7 years ago . Possible Duplicate: What is (double (^)(int))foofoo I've tried searching for a definition on Google and SO and I found examples in which they are used but not clearly defined. By "block" I mean the caret symbol ( ^ ). I found it on a site where cdecl they described : (double (^)(int, long long )) foo as cast foo into block(int, long long) returning double I've never once seen this symbol used before today. Can anyone clearly describe what a block is and include with it a minimal working example? Thanks. Blocks are a non-standard