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

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;
}