Issues in handling touches on subviews(uiviews) in UIScrollView

Question

I have craeted a UIScrollView using code and i have created subviews which i am creating dynamically from the DB that are added to the array of views and to the UIScrollviews.I am using touchesBegan and touchesMoved methods.The subview which i am selecting is not recognized,but the control comes into touchesBegan and touches moved method.I have posted the code below.Please anybody help me to overcome from this issue.

I have created the scrollview through code and i have subviews in an array named "arrayofviews".these subviews are the same views which are in the array.I am able to move these subviews which are from the DB on a normal view,but when i added these views to the scrollview its not working.

I have tried so many solutions which are in the net,but i couldn't get a proper solution.

.m file

- (void)viewDidAppear:(BOOL)animated
{

 scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 374)];
 scrollview.backgroundColor=[UIColor clearColor];
 [scrollview setScrollEnabled:YES];
 [scrollview setContentSize:CGSizeMake(300, 600)];
 scrollview.showsVerticalScrollIndicator = YES;
 scrollview.delaysContentTouches=NO;

    .
 .
 .
 .
    //here i am retrieving the controls from the DB and adding into the "arrayofviews" array which is an NSMutableArray

    //I have added subviews in this part to the scroll like
    [scrollview addSubview:vw1];

    [scrollview addSubview:vw2];

 .
 .
 .

 scrollview.userInteractionEnabled=NO;
 scrollview.scrollEnabled=FALSE;
 [self.view addSubview:scrollview];

 [self.view bringSubviewToFront:scrollview];


}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
 scrollview.userInteractionEnabled=YES;
 [self.nextResponder touchesBegan:touches withEvent:event];
 UITouch *touch = [[event allTouches] anyObject];

 CGPoint touchLocation;
 touchLocation.x=scrollview.contentOffset.x;
 touchLocation.y=scrollview.contentOffset.y;
 for(UIView *vw in arrayOfViews)
 {
  vw.userInteractionEnabled=YES;
  if([touch view]==vw)
  {
   vw.center=touchLocation;
  }
 }

}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event  //method to intiate the touch events
{
 [self.nextResponder touchesMoved:touches withEvent:event]; 
 UITouch *touch = [[event touchesForView:scrollview] anyObject];
 CGPoint touchLocation1;
 touchLocation1.x=scrollview.contentOffset.x;
 touchLocation1.y=scrollview.contentOffset.y;
 for(UIView *vw in arrayOfViews)
 {
  if([touch view]==vw)
  {
   vw.center=touchLocation1;   //statement to move the control
  }
 }

}

Waqas Raja Waqas Raja · Accepted Answer · 2011-01-20T10:53:38

change the line

scrollview.userInteractionEnabled=NO;

to

scrollview.userInteractionEnabled=YES;

reason

userInteractionEnabled tells the device, whether to accept touch events. As you disabled the touch on scrollView then how it could recived touches events...

cheers!!!

Issues in handling touches on subviews(uiviews) in UIScrollView

1 Answers