保活一个线程

BOOL __block isAuthalFinsh = NO;

    [BHCreateServiceI(YDContactProtocol) requestContactAuthal:^(BOOL success) {

        

        if (success) {

            

        }

        isAuthalFinsh = YES;

    }];

    while (!isAuthalFinsh) {

        [[NSRunLoop currentRunLoop] runMode:[[NSRunLoop currentRunLoop] currentMode] beforeDate:[NSDate distantFuture]];

    }