How can we move a view vertically upward and downwards? - iphone

Question

I have a tableview in my main view, and I need to move this tableview vertically with touch.
I want to drag this tableview upwards and downwards when touching at any position, and when my finger moves upward or downward the tableview will move according to the touch.
I have lots of controllers in my main view, so i want to touch the tableview only.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
How do I use these delegates in the question above?
Thanks in advance.

Answer 1

YOu just make a class , inherited from UITableview
Make a class Drag
Drag.h should be like this
#interface Drag : UITableView {
CGPoint touchingPoint;
}
and Modify Drag.m File by including following methods
Drag.m
- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
CGPoint pt = [[touches anyObject] locationInView:self];
touchingPoint = pt;
[[self superview] bringSubviewToFront:self];
}
- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
CGPoint pt = [[touches anyObject] locationInView:self];
[UITableView beginAnimations:nil context:nil];
[UITableView setAnimationDuration:0.1];
CGRect newFrame = self.frame;
newFrame.origin.y += pt.y - touchingPoint.y;
[self setFrame:newFrame];
[UITableView commitAnimations];
}
That's it.
Moreover , in Your viewDidLoad method,
put these lines
Drag *objDrag = [[Drag alloc] initWithFrame:CGRectMake(100, 200, 100, 100)];
objDrag.delegate = self;
objDrag.dataSource = self;
[objDrag setUserInteractionEnabled:YES];
[self.view addSubview:objDrag];
Remember: for dragging vertically , you must touch the separators of table otherwise it will consider touch to cell and will scroll instead of dragging.

Answer 2

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event can be used to create table with tapping the view and getting the CGPoint of the view and after then setting the tableview frame with these coordinates.
Note:- It will be better to represent in User Interface if table drag is done with
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event; with this function.