在屏幕上随机移动两个或多个对象

Question

I am trying to animate UIImageview to move randomly around the screen. For one UIImageView it is working fine. But for two or more objects it is not working. Can anyone help me?

-(void)animationLoop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {          
    [UIView beginAnimations:nil context:nil];          
    [UIView setAnimationDuration:1];             
    CGFloat x = (CGFloat) (arc4random() % (int) self.view.bounds.size.width);        
    CGFloat y = (CGFloat) (arc4random() % (int) self.view.bounds.size.height);           
    CGPoint squarePostion = CGPointMake(x, y);         
    image.center = squarePostion;     
    [UIView setAnimationDelegate:self];       
    [UIView setAnimationDidStopSelector:@selector(animationLoop:finished:context:)];
    [UIView commitAnimations];    
} 

Thanks in advance

Answer 1

Initially when you want to start the animation, start the animation as below.

NSNumber *number1 = [NSNumber numberWithInt:0];
[UIView beginAnimations:nil context:number1];          
[UIView setAnimationDuration:2.0];             
CGFloat x = (CGFloat) (arc4random() % (int) self.view.bounds.size.width);        
CGFloat y = (CGFloat) (arc4random() % (int) self.view.bounds.size.height);           
CGPoint squarePostion = CGPointMake(x, y);         
imgView1.center = squarePostion;     
[UIView setAnimationDelegate:self];   
[UIView setAnimationDidStopSelector:@selector(animationLoop:finished:context:)];
[UIView commitAnimations];    


number1 = [NSNumber numberWithInt:1];
[UIView beginAnimations:nil context:number1];          
[UIView setAnimationDuration:2.0];             
x = (CGFloat) (arc4random() % (int) self.view.bounds.size.width);        
y = (CGFloat) (arc4random() % (int) self.view.bounds.size.height);           
squarePostion = CGPointMake(x, y);         
imgView2.center = squarePostion;     
[UIView setAnimationDelegate:self];       
[UIView setAnimationDidStopSelector:@selector(animationLoop:finished:context:)];
[UIView commitAnimations];    

And your animationLoop:finished:context: method should be as follows.

-(void)animationLoop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {          
    [UIView beginAnimations:nil context:context];          
    [UIView setAnimationDuration:2.0];             
    CGFloat x = (CGFloat) (arc4random() % (int) self.view.bounds.size.width);        
    CGFloat y = (CGFloat) (arc4random() % (int) self.view.bounds.size.height);           
    CGPoint squarePostion = CGPointMake(x, y);   

    int i = [(NSNumber*)context intValue];
    if( i == 0 )
    {
        imgView1.center = squarePostion;    
    }
    else
    {
        imgView2.center = squarePostion;    
    }
    [UIView setAnimationDelegate:self];       
    [UIView setAnimationDidStopSelector:@selector(animationLoop:finished:context:)];
    [UIView commitAnimations];    
} 

Make the changes as mentioned above and try it. You would get what you required.