How to stop NSOperationQueue during dispatch_async

I think I found a solution. Here’s the updated code:

NSArray *array = [NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10", nil];

NSOperationQueue *myQueue = [NSOperationQueue new];
myQueue.maxConcurrentOperationCount =1;


for (NSString *string in array) {
    [myQueue addOperationWithBlock:^{
        [myQueue setSuspended:YES];
        NSLog(@"run: %@", string);
        dispatch_async(dispatch_get_main_queue(), ^{
            if (![string isEqualToString:@"1"]) {
                [myQueue setSuspended:NO];
            }
        });
    }];
}