Under the Bridge

Here’s an excellent display of applied Core Animation techniques:

Moving objects along a bezier path in iOS

The PathMove program allows the user to set up a predetermined set of bezier paths and then trigger a UIImageView object to move from start to end along that path. The program incorporates several options to do things like:

• Select the ending quadrant of the bezier path.
• Mix and match three different predefined bezier path segments for the starting and ending segments of the overall path.
• Allow the object to grow, shrink or remaiin the same size as it moves along the path.
• Rotate the object to match the tangent of the bezier curve as the object moves.
• Pre-Rotate the object by 90 degrees to accommodate how iOS calculates a tangent.
• Annotate the complete bezier path with the size and location of all of the path’s the control points

Read the whole thing, and check out the source at JoalahDesigns / PathMove!

h/t: @romainbriche!