eroth

func doSomethingClosure(_ completed: ((String) -> Void)) {
    completed("We're using closures.")
}

doSomethingClosure { result in
    print("result: \(result)")
}

// prints "result: We're using closures."

eroth

let disposeBag = DisposeBag()

func doSomethingRx() -> Observable<String> {
    return Observable.create { observer in
        observer.onNext("We're using RxSwift!")

        return Disposables.create()
    }
}

eroth

// This can all be done from the parent VC--AddSearchRegionsViewController is child

AddSearchRegionsViewController *addSearchRegionsVC = [[AddSearchRegionsViewController alloc] initWithNibName:@"BaseTableView" bundle:[NSBundle mainBundle]];

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Test" style:UIBarButtonItemStyleBordered target:self action:@selector(didPressBackButtonOnAddSearchRegionsVC)];
addSearchRegionsVC.navigationItem.backBarButtonItem = backButton;
    
[self.navigationController pushViewController:addSearchRegionsVC animated:YES];

-(void)didPressBackButtonOnAddSearchRegionsVC {

eroth

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <fstream>

using namespace std;

struct Legit {
    string city;