如何以编程方式创建与协议和代理一起使用的segue（swift 3 xcode）

Question

I'm trying to send information between classes and ViewControllers. I've looked at protocols and delegates as a way of achieving this but, it seems I need a segue between the viewcontrollers to access the delegate. I'm not using a storyboard so I can't create a segue, as such I have two questions:

1. Can I create a segue programmatically between two view controllers? If so, how do I do that?

2. Additionally, if I have two classes in the same viewController and I would like to access data from one to the other, is using protocols and delegates the best method to achieve this or is NSNotificationcenter a better option?

Answer 1

If you need set a delegate between another class if the segue is not used, You can create an instance of the secondViewController and with this instance you call call delegate refer this Code:

In Swift

if you are Presenting it modely,

let VC = SecondViewContoller()
    VC.delegate = self
    present(VC, animated: true, completion: nil)

if you are pushing,

let VC = MeaasgesController()
    VC.delegate = self
    self.navigationController?.pushViewController(VC, animated: true)

In Objective-C

if you are Presenting it modely,

SecondViewContoller *VC = [[SecondViewContoller alloc] init];
VC.delegate = self;
[self presentViewController:VC animated:YES completion:nil];

if you are pushing,

SecondViewContoller *VC = [[SecondViewContoller alloc] init];
VC.delegate = self;
[self.navigationController pushViewController:VC animated:YES];