How to make a sprite jump inside update loop in Cocos2D - ios

Question

I have a ball sprite that falls from the top and a boy underneath it. When the ball hits the boy's head I want it to follow a parabolic path. I tried using CCJumpTo as follows but I cannot get it to work. I'm calling the action inside the update loop. Am I not allowed to do that? Cant I call CCJumpTo inside the update loop?
- (void) jump
{
if(!method_called)
{
method_called=TRUE;
CCActionInterval *jump1 = [CCJumpTo actionWithDuration:3 position:CGPointMake(400, 400) height:150 jumps:1];
[_ball runAction:jump1];
NSLog(#"something");
}
else
{
NSLog(#"do nothing");
}
}
- (void)update:(ccTime)dt
{
time ++;
if ( dpad.leftJoystick.velocity.x > 0 && x < 2000 ) {
x = x + 10;
} else if ( dpad.leftJoystick.velocity.x < 0 && x > 0 ) {
x = x - 10;
}
if (x > 10 && x < 2000)
_boy.position = ccp(x, 100);
_ball.position = ccp(ball_x, ball_y);
ball_y = _ball.position.y - (speed * rebound);
_boy.anchorPoint = ccp(0, 0);
CGRect boyBox = CGRectMake(_boy.position.x, _boy.position.y, [_boy boundingBox].size.width, [_boy boundingBox].size.height);
_ball.anchorPoint = ccp(0, 0);
CGRect ballBox = CGRectMake(_ball.position.x, _ball.position.y, [_ball boundingBox].size.width, [_ball boundingBox].size.height);
if (CGRectIntersectsRect(boyBox, ballBox) && flag == 0)
{
rebound = -rebound;
flag = 1;
topFlag = 0;
[_ball stopAllActions];
[self jump];
}
if (_ball.position.y > 700 && topFlag == 0)
{
rebound = -rebound;
flag = 0;
topFlag = 1;
}
}
Thanks in advance.
EDIT:
Here's my init method
-(id) init
{
// always call "super" init
// Apple recommends to re-assign "self" with the "super's" return value
if( (self=[super init]) ) {
CGSize winSize = [[CCDirector sharedDirector] winSize];
self.ball = [CCSprite spriteWithFile:#"ball.png"
rect:CGRectMake(0, 0, 50, 50)];
self.ball.position = ccp(275, 999);
[self addChild:self.ball];
x = 0;
ball_y = 650;
ball_x = 300;
rebound = 1;
flag = 0;
topFlag = 0;
speed = 5;
time = 0;
[[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:
#"boy.plist"];
CCSpriteBatchNode *spriteSheet = [CCSpriteBatchNode batchNodeWithFile:#"boy.png"];
//spriteSheet.scaleX = 0.5;
//spriteSheet.scaleY = 0.5;
NSMutableArray *walkAnimFrames = [NSMutableArray array];
for(int i = 1; i <= 8; ++i) {
[walkAnimFrames addObject:[[CCSpriteFrameCache sharedSpriteFrameCache] spriteFrameByName:[NSString stringWithFormat:#"boy%d.png", i]]];
CCAnimation *walkAnim = [CCAnimation animationWithFrames:walkAnimFrames delay:.1f];
self.boy = [CCSprite spriteWithSpriteFrameName:#"boy1.png"];
_boy.position = ccp(100000, 100000);
self.walkAction = [CCRepeatForever actionWithAction:[CCAnimate actionWithAnimation:walkAnim]];
[CCAnimate actionWithAnimation:walkAnim restoreOriginalFrame:NO];
[_boy runAction:_walkAction];
_boy.flipX = YES;
[spriteSheet addChild:_boy];
dpad = [[MyJoystick alloc] init];
[self addChild:dpad z:10];
[self schedule:#selector(update:)];
}
[self addChild:spriteSheet];
}
return self;
}

Answer 1

Keep your action code inside a method and call it from update method using a boolean variable so that it would be called once only. Something like this:
take a boolean variable method_called in .h file:
-(void)update:(ccTime)dt
{
_boy.anchorPoint = ccp(0, 0);
CGRect boyBox = CGRectMake(_boy.position.x, _boy.position.y, [_boy boundingBox].size.width, [_boy boundingBox].size.height);
_ball.anchorPoint = ccp(0, 0);
CGRect ballBox = CGRectMake(_ball.position.x, _ball.position.y, [_ball boundingBox].size.width, [_ball boundingBox].size.height);
if (CGRectIntersectsRect(boyBox, ballBox) && flag == 0)
{
flag = 1; topFlag = 0;
[self callJumpAction];
}
}
-(void)callJumpAction
{
if(!method_called)
{
method_called=true;
CCActionInterval *jump1 = [CCJumpTo actionWithDuration:3 position:CGPointMake(400, 400) height:150 jumps:1];
[_ball runAction:jump1];
}
else
{
NSLog(#"do nothing");
}
}
Hope this will help.