colinfwalsh / theFinalCountdown-ios-0616

The Final Countdown

Let's make a timer app!

The Interface:

Start with some theme music by listening to this amazing cover song.

Here is a picture of the countdown timer app in portrait:

Here is a picture after you hit the Start button.

Your goal is to make a pared down version of this:

• Don't do the tab bar along the bottom
• Don't do the When Timer Ends feature
• For the first iteration, just use regular buttons. That lower grey thing is half of the height of the view.
• Center the start/pause buttons in the lower grey sections
• For right now, when you tap the start button the UIPickerView should be hidden, and the label with a time should be shown. Don't worry about making it work just yet.

Making it Work

• Users should be able to select hours and minutes.
• The Pause button should be disabled by default. When you hit Start, the countdown should start and the Start button should turn into Cancel.
• During the countdown the Pause button will be enabled and should pause, not reset the countdown timer.
• Check out NSTimer in the Apple Documentation, and perhaps NSDateComponents.

Extra Credit

• When you rotate to landscape, have it just show the time label full screen like this:

• In landscape, if the timer is not active, show 00:00:00.
• Make your timer its own class that can be paused, stopped, and resumed and track its own internal state.
• Try using DKCircleButton instead of regular buttons.

View The Final Countdown on Learn.co and start learning to code for free.