moving 2 objects at same time - ios

Question

In my current ios project, I have dedicated one side of the screen to one object and the other side of the screen to the other object and i have made it so that if you swipe your finger across one side of the screen on the designated object would move. However, I want to make it so that you can move both objects at the same time in different movement but i cannot figure out how to do so. Below is my current code.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
if (location.x <= 270 ) {
[Person setCenter:CGPointMake(location.x, Person.center.y)];
}
else {
[Person1 setCenter:CGPointMake(location.x, Person1.center.y)];
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
if (location.x <= 270 ) {
[Person setCenter:CGPointMake(location.x, Person.center.y)];
}
else {
[Person1 setCenter:CGPointMake(location.x, Person1.center.y)];
}
}

Answer 1

you should start handling multiple touches that are delivered in the touches set - loop through all the UITouch objects and do your handling.
Edit:
here's your code:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
for(UITouch *touch in [event allTouches]) {
CGPoint location = [touch locationInView:touch.view];
if (location.x <= 270 ) {
[Person setCenter:CGPointMake(location.x, Person.center.y)];
}
else {
[Person1 setCenter:CGPointMake(location.x, Person1.center.y)];
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
for(UITouch *touch in [event allTouches]) {
CGPoint location = [touch locationInView:touch.view];
if (location.x <= 270 ) {
[Person setCenter:CGPointMake(location.x, Person.center.y)];
}
else {
[Person1 setCenter:CGPointMake(location.x, Person1.center.y)];
}
}
}

Answer 2

If you move the -touchesBegan & touchesMoved code into the Person view class rather than the view/or viewController class it is in currently then those views can handle touches independent of each other and simultaneously.
*Edit: More info:
Currently you are handling touches events (in I'm guessing a UIViewController) using the code you pasted above, if you moved that code into your Person class you have created you could make the code simpler and achieve the result you desire.
This will have the effect that the Person will decide if it is being touched and where and will move itself accordingly.
In your Person.m file add this code,
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:self.superview];
[self moveToLocation:location];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:self.superview];
[self moveToLocation:location];
}
-(void)moveToLocation:(CGPoint)location{
CGFloat halfOfPersonWidth = self.bounds.size.width /2.0f;
CGFloat halfOfSuperviewWidth = self.superview.bounds.size.width/2.0f;
// Stop Person from going off left screen edge
if ((location.x - halfOfPersonWidth) <= 0.0f){
return;
} // Stop Person from going off right screen edge
else if ((location.x + halfOfPersonWidth) >= self.superview.bounds.size.width){
return;
}
if (self.center.x < halfOfSuperviewWidth) {
// Person is on the left of the screen and should not move to right side
if ((location.x + halfOfPersonWidth) > halfOfSuperviewWidth) {
return;
}
} else{
// Person is on the right of the screen and should not move to left side
if ((location.x - halfOfPersonWidth) < halfOfSuperviewWidth) {
return;
}
}
// If we have made it this far then we can move the Person
// move to touch location on x axis only
[self setCenter:CGPointMake(location.x, self.center.y)];
}
Now in your View Controller class you can delete the original -touchesBegan & -touchesMoved code that you pasted here, Or just comment it out if you want to be cautious
/* put slash asterisks above the code and asterisks slash below the code to comment out */
If you build and run you should be able to move each Person view around as before but if you put a finger on each Person view at the same time you should be able to move them simultaneously.