How to move from one ViewController to another ViewController without using Storyboard?

Question

iOS

There is a library that in my ViewController runs over its own. There is a button in the library VC. How do I navigate from a library VC to my VC on a button click without using a Storyboard? Function for button:

func didSelectButton(sender: UIBarButtonItem) {
        
    }

Answer 1

I can suggest the following:

-(void) createSecondViewController{
    
    NSLog(@"createSecondViewController is called");
    
    DTSecondViewController* secondViewController=[[DTSecondViewController alloc]initWithGradeAndArray:self.grade mutArr:self.coefficientsValuesArray];// Кастомная
    
    secondViewController.view.backgroundColor     =[UIColor lightGrayColor];
    [self presentViewController:secondViewController animated:YES completion:^{
        NSLog(@"present VC is chacged");
    } ];
}//createSecondViewController

I think you can find a similar method in Swift))