how to drag dynamically created UIImageview in obj c (xcode) - ios

Question

i have gone through the many tutorials to drag an image on screen using touchesmoved method
but most of them are not for dynamically created imageviews
in my project i created 5 UIImageview programatically,
now i want that user can drag them on screen>> i also follow this answer
Question but all in vain , no success so far>
the code for creating the dynamically imageview is
for (int i = 0; i < index ; i++)
{
UIImageView *imageView1 = [[UIImageView alloc] initWithImage:
[UIImageimageNamed:image_name]];
self.imageView1.userInteractionEnabled = YES;
imageView1.frame = CGRectMake(xvalue, yvalue, 80.0f, 80.0f);
self.view.userInteractionEnabled = YES;
[self.view addSubview:imageView1];
}
Thanks in advance for good replies

Answer 1

I'm a little confused with how you are creating UIImageViews because you are using a for-loop but a static name. So you might have 15 UIImageViews with the name "imageView1".
But anyways, this shouldn't matter at all if you are using the code in the question you linked to. Perhaps you put the lines in out of order... this is the proper order. (If it doesn't work let me know, along with the errors you get)
//-(void)ViewDidLoad? {???? is this your function??
int xvalue = 0;//?? not sure where you declared these
int yvalue = 0;//?? not sure where you declared these
for (int i = 0; i < index ; i++) {
UIImageView *imageView1 = [[UIImageView alloc] initWithImage:
[UIImageimageNamed:image_name]];
self.imageView1.userInteractionEnabled = YES;
imageView1.frame = CGRectMake(xvalue, yvalue, 80.0f, 80.0f);
self.view.userInteractionEnabled = YES;
[self.view addSubview:imageView1];
}
self.elements=[myElements getElements];
imagesElements = [[NSMutableArray alloc]init];
for(ElemetsList *item in self.elements) {
UIImageView *oneelement = [[UIImageView alloc] initWithImage:[UIImage imageNamed:item.imgElement]];
oneelement.frame = CGRectMake(item.positionX, item.positionY, item.width, item.height);
oneelement.userInteractionEnabled=YES;
[imagesElements addObject:oneelement];
}
for(UIImageView *img in imagesElements) {
[self.view addSubview:img];
}
//}? End Function, whatever it may be...?
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
for(UIImageView *img in imagesElements)
{
if([self view] == img)
{
CGPoint location = [touch locationInView:self.view];
img.center=location;
}
}
}
If you just want to hard-code in the moving for one image try this:
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
imageView1.center=[touch locationInView:self.view];
}

Answer 2

There are plenty of ways to address this issue. You can add UIPanGestureRecognizer to each UIImageView at the time its creation, or you can use touchesBegan:, touchesMoved: on self (assuming it's a UIViewController) and traverse each UIImageView to see if its frame contains the point of the touch.