[Solved] Given this code snippet, what will happen when the button is tapped?func buttonTapped() { let vc = SettingsViewController() navigationController?.pushViewController(vc, animated: true) } | iOS Swift

iOS Swift - Navigation

Given this code snippet, what will happen when the button is tapped?

func buttonTapped() {
  let vc = SettingsViewController()
  navigationController?.pushViewController(vc, animated: true)
}

AThe app will crash because SettingsViewController is not initialized properly.

BNothing will happen because pushViewController is called without a navigation controller.

CThe current screen will be removed and replaced by SettingsViewController.

DThe app will navigate to the SettingsViewController screen with animation.

Step-by-Step Solution

Solution:

Step 1: Analyze the code behavior
The code creates a new SettingsViewController instance and pushes it onto the navigation stack.
Step 2: Understand navigationController optional chaining
If navigationController exists, it will push with animation, moving to the new screen.
Final Answer:
The app will navigate to the SettingsViewController screen with animation. -> Option D
Quick Check:
pushViewController with valid instance = navigate forward [OK]

Quick Trick: pushViewController moves forward if navigationController exists [OK]

Common Mistakes:

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