Build a custom circular progress bar in UIKit
WHAT IT TESTS: Vector drawing with CAShapeLayer plus strokeEnd animation. OUTLINE: Draw an arc with UIBezierPath, assign it to a CAShapeLayer path, set lineWidth and no fill, animate strokeEnd 0 to 1.
WHAT IT TESTS: Whether you can compose Core Animation layers for resolution-independent drawing. ANSWER OUTLINE: Create a UIBezierPath circular arc and set it as a CAShapeLayer's path. Give the layer strokeColor, lineWidth, and a clear fillColor so only the ring shows. Progress maps to strokeEnd between zero and one; animating it with CABasicAnimation or by setting the value draws the ring filling up. Layer a track layer behind it for the unfilled portion.
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- #ios
- #uikit
- #cashapelayer
- #uibezierpath
- #animation
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