Sticking image to another image - ios

Question

I currently have some code which creates a UIImageView at a random location which is animated towards the bottom of the screen. When that object collides with another object which is controlled by the user, the collision is detected. However, I do not know how to then make the random image stay on top of of the user controlled image after the collision so that the random image moves together with the user controlled one. This is the code that I have so far:
-(void)spawnMechanism{
timeSinceLastSpawn++;
if(timeSinceLastSpawn >= 3)
{
if( arc4random() % 10 < 7 ){
UIImageView *spawnGood;
spawnGood=[[UIImageView alloc]initWithFrame:CGRectMake(arc4random() % 700, -100, 70,70)];
UIImage *image;
image=[UIImage imageNamed:#"friendly-01"];
[spawnGood setImage:image];
[self.view addSubview:spawnGood];
NSLog(#"spawnGood spawned");
[UIView animateWithDuration:2.0
delay: 0.0
options: UIViewAnimationOptionCurveLinear
animations:^{
CGRect frame1 =[spawnGood frame];
frame1.origin.y =frame1.origin.y+950;
[spawnGood setFrame:frame1];
}
completion:^(BOOL finished){
if(CGRectIntersectsRect(userToken.frame, spawnGood.frame)){
NSLog(#"Good Collision");
}else{
[UIView animateWithDuration:2.0 delay:0.0 options:UIViewAnimationOptionCurveLinear animations:^{
CGRect frame1 =[spawnGood frame];
frame1.origin.y =frame1.origin.y+950;
[spawnGood setFrame:frame1];
}
completion:nil];
};
}
];}
}
}
To control the user image, I have this code:
- (IBAction)right {
/*[UIView animateWithDuration:0.10f
animations:^{
_userToken.frame = CGRectMake(_userToken.frame.origin.x + 80, _userToken.frame.origin.y, _userToken.frame.size.width, _userToken.frame.size.height);
}];
}*/
if(goRight==nil){
goRight=[NSTimer scheduledTimerWithTimeInterval:rate
target:self
selector:#selector(goRight)
userInfo:nil
repeats:YES];
}
[self myDetectCollisionsOnRight];
}
- (IBAction)left{
/*[UIView animateWithDuration:0.10f
animations:^{
_userToken.frame = CGRectMake(_userToken.frame.origin.x - 80, _userToken.frame.origin.y, _userToken.frame.size.width, _userToken.frame.size.height);
}];
}*/
if(goLeft==nil){
goLeft=[NSTimer scheduledTimerWithTimeInterval:rate
target:self
selector:#selector(goLeft)
userInfo:nil
repeats:YES];
}
[self myDetectCollisions];
}
-(IBAction)stopLeft{
[goLeft invalidate];
goLeft=nil;
}
-(IBAction)stopRight{
[goRight invalidate];
goRight=nil;
}
-(void)goLeft{
userToken.center =CGPointMake(userToken.center.x -25, userToken.center.y);
[self myDetectCollisions];
}
-(void)goRight{
userToken.center =CGPointMake(userToken.center.x +25, userToken.center.y);
[self myDetectCollisionsOnRight];
}
Is anyone able to suggest a solution to this?

Answer 1

Try using -addSubview:. I think if it is added to userToken and then userToken is moved, spawnGood will move with it because it is a subview.
if(CGRectIntersectsRect(userToken.frame, spawnGood.frame)){
NSLog(#"Good Collision");
[spawnGood removeFromSuperView]
[userToken addSubview: spawnGood];
//Position the subview where the collision took place here
}