有什么方法可以检查SKSpriteNode是否已从父级移除？

Question

I'm trying to check if this SKSpriteNode has been removed from the screen to implement a piece of code if it has but I can't seem to figure it out.

My code;

if (player.position.y > self.frame.size.height) {
    NSLog(@"out of frame");
    [self runAction:[SKAction sequence:@[
                                         [SKAction waitForDuration:0.5],
                                         [SKAction runBlock:^{

        levelMenu *mainMenu = [[levelMenu alloc] initWithSize:self.size];
        [self.view presentScene:mainMenu transition:[SKTransition fadeWithDuration:0.6]];

    }],
                                         ]]];
}

But this isn't working.

Is there anything I could do to test for when it's been removed from the parent. Ie something along the lines of " If (player hasLeftScene) or (player hasBeenRemovedFromParent) " or something?

I also tried testing for when the player.position.y > 568 (4-inch display) but it didn't work either.

Answer 1

Check for node.parent. It is nil if it has no parent (was removed from one).

if (node.parent) {
// node has parent, was not removed
} else {
// node does not have parent, was removed
}