Follow curve to point with Sprite Kit

curve.m

// Imagine shooting an arrow to a point
CGMutablePathRef path = CGPathCreateMutable();

// This will move an invisible path marker to a starting point
// In my case, the node is a child node of a sprite, so it is the local coords and not the screen coords
CGPathMoveToPoint(path, NULL, 10, 0);

// The 3-8th parameters are x/y coords. The arrow iwll first hit x:100 and y:50.
// It will then raise up a bit as it keeps going and finally drop to the target at x:300 y:0
CGPathAddCurveToPoint(path, NULL,
                      100, 50,
                      200, 75,
                      300, 0);
                      
// Create an action based on this curve. oritentToPath will make the arrows tip point up and down in the correct spots.
// Be careful, it is based off of each sprite having the correct default state. (i.e.: arrows and characters are vertical by default)
SKAction *followCurve = [SKAction followPath:path asOffset:NO orientToPath:YES duration:3.0];

// Run the action on the SKSpriteNode        
[arrow runAction:followCurve]