Sprite doesn't regenerate in Sprite Kit - xcode

Question

I am trying to get the sprite to regenerate itself once it moves off of the screen, but no luck.
#import "MyScene.h"
#implementation MyScene
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
/* Setup your scene here */
self.backgroundColor = [SKColor colorWithRed:0.05 green:0.15 blue:0.2 alpha:1.0];
SKSpriteNode *pole = [SKSpriteNode spriteNodeWithImageNamed:(#"pole")];
bamboo.position = CGPointMake (30, 0);
bamboo.size = CGSizeMake(15, 1136);
[self addChild: pole];
SKSpriteNode *pole2 = [SKSpriteNode spriteNodeWithImageNamed:(#"pole")];
pole2.position = CGPointMake (290, 0);
pole2.size = CGSizeMake(15, 1136);
[self addChild: pole2];
SKSpriteNode *spike = [SKSpriteNode spriteNodeWithImageNamed:(#"spike")];
spike.position = CGPointMake (45, 600);
spike.size = CGSizeMake(15, 75);
SKAction *moveDown = [SKAction moveByX:(0) y:(-10) duration:(.05)];
[spike runAction:[SKAction repeatActionForever:moveDown]];
[self addChild: spike];
}
return self;
}
-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
if (_spike.position.y < 250) {
_spike.position = CGPointMake(45, 600);
}
}
#end
What could be the problem? Xcode does not give me an error, the "spike" node simply moves off the screen and does not reset itself. I have changed the values in the conditional, but the same thing happens. It's like the conditional is being ignored.

Answer 1

What you should do is to check Sprite's position in the update method, you can try this;
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
/* Setup your scene here */
_spike = [SKSpriteNode spriteNodeWithImageNamed:(#"spike")];
_spike.position = CGPointMake (45, 600);
_spike.size = CGSizeMake(15, 75);
SKAction *moveDown = [SKAction moveByX:(0) y:(-10) duration:(.05)];
[_spike runAction:[SKAction repeatActionForever:moveDown]];
[self addChild:_spike];
}
return self;
}
-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
if (_spike.position.y < 250) {
_spike.position = CGPointMake(45, 600);
}
}