The Bull’s Eye game

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  • Put text on the screen, such as the “Score:” and “Round:” labels. Some of this text changes over time, for example the score, which increases when the player scores points.
  • Put a slider on the screen and make it go between the values 1 and 100.
  • Read the value of the slider after the user presses the Hit Me button.
  • Generate a random number at the start of each round and display it on the screen. This is the target value.
  • Compare the value of the slider to that random number and calculate a score based on how far off the player is. You show this score in the alert popup.
  • Put the Start Over button on the screen. Make it reset the score and put the player back into the first round.
  • Put the app in landscape orientation.
  • Make it look pretty. :-)

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Code

@IBAction func showAlert() {
	let alert = UIAlertController(title: "Hello, World",
			message: "This is my first app!",
			preferredStyle: .Alert)

	let action = UIAlertAction(title: "Awesome", style: .Default,
			handler: nil)

	alert.addAction(action)

	presentViewController(alert, animated: true, completion: nil)
}

Event flow

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