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Animated Record Button with PaintCode

Here is an example of how to use PaintCode to create an animated button.

The code for this project is available on GitHub.

Background

I wanted to create a record/stop button for a project I’m working on that mirrored the appearance of the record/stop button found in Apple’s iOS Camera Video recorder and Voice Recorder applications.

Voice Recorder

PaintCode Design

PaintCode makes creating simple designs like this very simple.

PaintCode

I have a square canvas in which there are two concentric circles. The outer circle is the button’s frame (white), and the inner circle is the tappable button (red).

Using PaintCode’s expressions I have two parameters:

  • isPressed, a boolean, controls the color used to draw the inner circle
  • isRecording, a fraction (0.0->1.0) controls the transition of the inner circle from a circle to a smaller rounded square

The Code

When the button is tapped, isPressed is set to true until the tap ends. When the tap ends, the value of isRecording is animated from 0.0 -> 1.0 or 1.0 to 0.0 depending on the state of the button. That’s it.

Here is the result:

RecordButton


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