How to check whether a CGPoint is inside a UIImageView?
- by Horace Ho
In touchesBegan:
CGPoint touch_point = [[touches anyObject] locationInView:self.view];
There are tens of UIImageView around, stored in a NSMutableArray images. I'd like to know is there a built-in function to check if a CGPoint (touch_point) is inside one of the images, e.g.:
for (UIImageView *image in images) {
// how to test if touch_point is tapped on a image?
}
Thanks
Follow up:
For unknown reason, pointInside never returns true. Here is the full code.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
touch_point = [touch locationInView:self.view];
for (UIImageView *image in piece_images) {
if ([image pointInside:touch_point withEvent:event]) {
image.hidden = YES;
} else {
image.hidden = NO;
}
NSLog(@"image %.0f %.0f touch %.0f %.0f", image.center.x, image.center.y, touch_point.x, touch_point.y);
}
}
although I can the two points are sometimes identical in the NSLog output ...
I also tried:
if ([image pointInside:touch_point withEvent:nil])
the result is the same. never returns a true.
To eliminate the chance of anything goes with with the images. I tried the following:
if (YES or [image pointInside:touch_point withEvent:event])
all images are hidden ater the first click on screen.
