Why does NSArray of UIImageViews follow a certain pattern? - ios

Question

I have an array of 4 UIImageViews A, A2, A3 and A4. I want them to be dragged on to another imageView called answerA. Every time I drag one of them on the answer it should change the image on answerA to a number which tells how many were dragged on it. E.g. If i drag A on answerA then answerA image will change to number 1. If i drag one more A from the array then it will change to number 2. For some reason my array follows a strange pattern. The first one i drag changes to number 1, the second one does nothing, the third one will change to number 2 and the fourth will change it back to number 1. No matter in which order i drag them it will always be in same pattern.
This is my array of 4 imageViews
#property (strong, nonatomic) NSArray *letterA; //initialized in .h
self.letterA = #[A, A2, A3, A4];//initialized in .m
My method to check collision:
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
int intersectionCount = 0;
for (UIImageView *letter in letterA) {
if (CGRectIntersectsRect(letter.frame ,answerA.frame)) {
letter.userInteractionEnabled = NO;
letter.hidden = YES;
intersectionCount++;
}
}
if (intersectionCount == 1) {
UIImage *Pic1 = [UIImage imageNamed:#"number1.png"];
[correctCounterA setImage:Pic1];
}
else if (intersectionCount == 2) {
UIImage *Pic2 = [UIImage imageNamed:#"number2.png"];
[correctCounterA setImage:Pic2];
}
else if (intersectionCount == 3) {
UIImage *Pic3 = [UIImage imageNamed:#"number3.png"];
[correctCounterA setImage:Pic3];
}
else if (intersectionCount == 4) {
UIImage *Pic4 = [UIImage imageNamed:#"number4.png"];
[correctCounterA setImage:Pic4];
}
NOTE: correctCounterA is a small imageView on top of answerA so that only that small section would change the image to numbers.

Answer 1

You need to modified touchesEnded as like below. here you are finding drag image in wrong way. may this help you.
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
for (UIImageView *letter in letterA) {
if (CGRectIntersectsRect(letter.frame ,answerA.frame)) {
letter.userInteractionEnabled = NO;
letter.hidden = YES;
intersectionCount++;
break;
}
}
if (intersectionCount == 1) {
UIImage *Pic1 = [UIImage imageNamed:#"number1.png"];
[correctCounterA setImage:Pic1];
}
else if (intersectionCount == 2) {
UIImage *Pic2 = [UIImage imageNamed:#"number2.png"];
[correctCounterA setImage:Pic2];
}
else if (intersectionCount == 3) {
UIImage *Pic3 = [UIImage imageNamed:#"number3.png"];
[correctCounterA setImage:Pic3];
}
else if (intersectionCount == 4) {
UIImage *Pic4 = [UIImage imageNamed:#"number4.png"];
[correctCounterA setImage:Pic4];
}
}
Edit : According to your requirement, you need to declare intersectionCount in .h file and in viewDidLoad, you need to assign as below.
int intersectionCount = 0;
and Change touchesEnded like as above.