How to wrap an asynchronous method that takes a block and turn it synchronous in Objective-C

Question

I want to wrap an async API that look like this:

[someObject completeTaskWithCompletionHandler:^(NSString *result) {

}];

into a synchronous m

Answer 1

dispatch_semaphore_wait blocks the main queue in your example. You can dispatch the async task to a different queue:

__block NSString *returnResult;
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0UL);
dispatch_async(queue,^{
     result = [someObject completeTaskSynchronously];
});

Or use some other system, like NSRunLoop:

   __block finished = NO;
   [self completeTaskWithCompletionHandler:^(NSString *result) {
       resultResult = result;
       finished = YES;
   }];
    while (!finished) {
        // wait 1 second for the task to finish (you are wasting time waiting here)
        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:1]];
    }

Answer 2

I think the better solution will be NSRunLoop as given below. It's simple and working fine.

- (NSString *)getValue {

    __block BOOL _completed = NO;
    __block NSString *mValue = nil;

    [self doSomethingWithCompletionHandler:^(id __nullable value, NSError * __nullable error) {
        mValue = value;
        _completed = YES;
    }];

    while (!_completed) {
        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
    }

    return mValue;
}

Answer 3

You can try to use NSOperations for this doing your things asynchronously.

Answer 4

Using an NSRunLoop is the easiest to do here.

__block NSString* result = nil;
[self completeTaskWithCompletionHandler:^(NSString *resultstring) {
    result = resultstring;
}];
while (!result) {
    [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
}