SKAction: How to Animate Random Repeated Actions

ios, sprite-kit

Solution

No bells or whistles, but I think this should get you on your way:

Edit: Sorry it should be:

SKAction *randomXMovement = [SKAction runBlock:^(void){
    NSInteger xMovement = arc4random() % 20;
    NSInteger leftOrRight = arc4random() % 2;
    if (leftOrRight == 1) {
        xMovement *= -1;
    }
    SKAction *moveX = [SKAction moveByX:xMovement y:0 duration:1.0];
    [aSprite runAction:moveX];
}];

SKAction *wait = [SKAction waitForDuration:1.0];
SKAction *sequence = [SKAction sequence:@[randomXMovement, wait]];
SKAction *repeat = [SKAction repeatActionForever:sequence];
[aSprite runAction: repeat];

Problem

I'd like to run a repeating `SKAction` but with random values on each repeat. I have read this question here that shows one way to do this. However, I want my sprite's movements to be animated, not simply changing its position. One solution I have come up with is to run a sequence of actions, with the final action calling my move method in a recursive fashion: ``` - (void)moveTheBomber { __weak typeof(self) weakSelf = self; float randomX = // determine new "randomX" position SKAction *moveAction = [SKAction moveToX:randomX duration:0.25f]; SKAction *waitAction = [SKAction waitForDuration:0.15 withRange:0.4]; SKAction *completionAction = [SKAction customActionWithDuration:0 actionBlock:^(SKNode *node, CGFloat elapsedTime) { [weakSelf moveTheBomber]; }]; SKAction *sequence = [SKAction sequence:@[moveAction, waitAction, completionAction]]; [self.bomber runAction:sequence]; } ``` Recursively calling this method feels 'icky' to me, but given my limited experience with SpriteKit, seemed like the most obvious way to accomplish this. How can I animate the random movement of a sprite on screen forever?

Original source