how to check multiple CGRectIntersectsRect - iphone

Question

based on how to add on touch and detect UIImageView on view so i could move it around and not adding one on top of it?
i got around of checking CGRectIntersectsRect single uiimageview. how will i need to check multiple uiimageview?
CORRECT
WRONG
-(void)initImagesAndGesture
{
UIImage *img = [UIImage imageNamed:#"beer.png"];
imgView1 = [[UIImageView alloc]initWithImage:img];
[imgView1 setFrame:CGRectMake(0, 0, 75, 115)];
[imgView1 setUserInteractionEnabled:YES];
UIPanGestureRecognizer *recognizer1 = [[UIPanGestureRecognizer alloc]initWithTarget:self action:#selector(handlePan1:)];
[imgView1 addGestureRecognizer:recognizer1];
[self.view addSubview:imgView1];
img = [UIImage imageNamed:#"cups.png"];
imgView2 = [[UIImageView alloc]initWithImage:img];
[imgView2 setFrame:CGRectMake(200, 240, 64, 75)];
[imgView2 setUserInteractionEnabled:YES];
recognizer1 = [[UIPanGestureRecognizer alloc]initWithTarget:self action:#selector(handlePan1:)];
[imgView2 addGestureRecognizer:recognizer1];
[self.view addSubview:imgView2];
}
-(void)handlePan1:(UIPanGestureRecognizer *)recognizer
{
if (!(CGRectIntersectsRect(imgView1.frame, imgView2.frame)))
{
CGPoint pre_moveLocation = [recognizer locationInView:recognizer.view];
NSLog(#"previous location %#",NSStringFromCGPoint(pre_moveLocation));
CGPoint translation = [recognizer translationInView:self.view];
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:recognizer.view];
}
else
{
NSLog(#"intersect!");
CGPoint pre_moveLocation = [recognizer locationInView:recognizer.view];
NSLog(#"previous location %#",NSStringFromCGPoint(pre_moveLocation));
recognizer.view.center = CGPointMake(pre_moveLocation.x, pre_moveLocation.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:recognizer.view];
//[imgView2 setFrame:CGRectMake(200, 240, 64, 75)];
//[imgView1 setFrame:CGRectMake(0, 0, 75, 115)];
}
}
-(void)addImgView:(UIPanGestureRecognizer *)recognizer
{
NSLog(#"tappppp");
UIImage *img = [UIImage imageNamed:#"beer.png"];
UIImageView *imgView = [[UIImageView alloc]initWithImage:img];
CGPoint tapLocation = [recognizer locationInView:recognizer.view];
[imgView setCenter:CGPointMake(tapLocation.x,tapLocation.y)];
[imgView setUserInteractionEnabled:YES];
UIPanGestureRecognizer *recognizer1 = [[UIPanGestureRecognizer alloc]initWithTarget:self action:#selector(handlePan1:)];
[imgView addGestureRecognizer:recognizer1];
[self.view addSubview:imgView];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self initImagesAndGesture];
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(addImgView:)];
tapRecognizer.numberOfTapsRequired = 2;
tapRecognizer.numberOfTouchesRequired = 1;
[tapRecognizer setDelegate:self];
self.view.userInteractionEnabled = YES;
[self.view addGestureRecognizer:tapRecognizer];
}

Answer 1

Just iterate through all subviews...
// targetView is the one you are checking...
- (BOOL)isViewIntersectingAnyOtherViews:(UIView*)targetView {
for (UIView *view in self.view.subviews) {
if (view == targetView) continue; // Don't check against your own view
if (CGRectIntersectsRect(view, thisView)) {
return YES;
}
}
return NO;
}