issue is running and stopping CFRunLoop - c++

Question

i have situation where i need to wait till one block is get completed and then only move forward with my code for that i use CFRunLooprun and stop this is how do it i will explain more things in comment in my code
[self fatchAllEvent]; // BLOCK IS IN THIS METHOD
NSLog(#"loop will start");
CFRunLoopRun();
NSLog(#"LOOP IS STOOPED");
-(void)fatchAllEvent{
events = [[NSMutableArray alloc]init];
// // Get the appropriate calendar
NSCalendar *calendar = [NSCalendar currentCalendar];
eventStore = [[EKEventStore alloc] init];
if ([eventStore respondsToSelector:#selector(requestAccessToEntityType:completion:)])
{
// __block typeof (self) weakSelf = self; // replace __block with __weak if you are using ARC
dispatch_async(dispatch_get_main_queue(), ^{
[eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error)
{
if (granted)
{
[events removeAllObjects];
NSLog(#" granted");
NSLog(#"User has granted permission!");
// Create the start date components
NSDateComponents *twoYearAgoComponents = [[NSDateComponents alloc] init];
twoYearAgoComponents.year = -2;
NSDate *oneDayAgo = [calendar dateByAddingComponents:twoYearAgoComponents
toDate:[NSDate date]
options:0];
// Create the end date components
NSDateComponents *twoYearFromNowComponents = [[NSDateComponents alloc] init];
twoYearFromNowComponents.year = 2;
NSDate *oneYearFromNow = [calendar dateByAddingComponents:twoYearFromNowComponents
toDate:[NSDate date]
options:0];
// Create the predicate from the event store's instance method
NSPredicate *predicate = [eventStore predicateForEventsWithStartDate:oneDayAgo
endDate:oneYearFromNow
calendars:nil];
// Fetch all events that match the predicate
events =(NSMutableArray*) [eventStore eventsMatchingPredicate:predicate];
NSLog(#"The content of array is%#",events);
}
else
{
NSLog(#"Not granted");
}
NSLog(#"LOOP WILL STOP"); // THIS GETS PRINT
CFRunLoopStop(CFRunLoopGetCurrent()); // BUT LOOP IS NOT STOPPING HERE SO MY APP JUST GET HANGED ;
}];
});
}
else
{
[events removeAllObjects];
NSLog(#"Autometiclly granted permission!");
// Create the start date components
NSDateComponents *twoYearAgoComponents = [[NSDateComponents alloc] init];
twoYearAgoComponents.year = -2;
NSDate *oneDayAgo = [calendar dateByAddingComponents:twoYearAgoComponents
toDate:[NSDate date]
options:0];
// Create the end date components
NSDateComponents *twoYearFromNowComponents = [[NSDateComponents alloc] init];
twoYearFromNowComponents.year = 2;
NSDate *oneYearFromNow = [calendar dateByAddingComponents:twoYearFromNowComponents
toDate:[NSDate date]
options:0];
// Create the predicate from the event store's instance method
NSPredicate *predicate = [eventStore predicateForEventsWithStartDate:oneDayAgo
endDate:oneYearFromNow
calendars:nil];
// Fetch all events that match the predicate
events =(NSMutableArray*) [eventStore eventsMatchingPredicate:predicate];
NSLog(#"The content of array is%#",events);
}
}

Answer 1

You can't do that this way - you have to call your function, and then in the completion block of the async dispatch, at the end, call a function that continues with what you want to do.
In your above code you mix up asynchronous programming with synchronous execution, that won't work.