SPClockView

1. Can set the time zone or choose from a list of time zone
2. Automatically detects the day or night and changes the background of the clock
3. Doesn't use NSTimer to schedule the time, so it won't be blocked by any other UI operations.
4. Swipe to delete the added clock
5. Displays the name of the timezone and time in digital format
6. Digital clock to display the name in format: HH:mm:ss

   pod 'SPClockView'