How to make UIButton Draggeable? - iphone

Question

I need to drag and drop the uibutton in subview only.
Actually i am taking subview in main view. UIbutton is add in subview. When i drag the button it moves on both view but i need to drag button only in subview. Can anyone help me please.
Thanks in advance.
- (void) drag
{
//subview
UIView *viewscramble = [[UIView alloc] initWithFrame:CGRectMake(0, 90, 320, 50)];
[viewscramble setBackgroundColor:[UIColor redColor]];
[self.view addSubview:viewscramble];
//button
UIButton *btnscramble = [[UIButton alloc] initWithFrame:CGRectMake(5, 0, 50, 50)];
btnscramble.titleLabel.text = #"A";
[btnscramble setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[btnscramble addTarget:self action:#selector(imageMoved:withEvent:) forControlEvents:UIControlEventTouchDragInside];
[btnscramble setBackgroundImage:[UIImage imageNamed:#"box.png"] forState:UIControlStateNormal];
//add button`
[viewscramble addSubview:btnscramble];
[btnscramble release];
}
- (IBAction)imageMoved:(id)sender withEvent:(UIEvent *) event
{
CGPoint point = [[[event allTouches]anyObject] locationInView:viewscramble];
UIControl *control = sender;
control.center = point;
}

Answer 1

i just found the solution of your Question from:- http://www.cocoanetics.com/2010/11/draggable-buttons-labels/
- (void)viewDidLoad
{
[super viewDidLoad];
// create a new button
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:#"Drag me!" forState:UIControlStateNormal];
// add drag listener
[button addTarget:self action:#selector(wasDragged:withEvent:)
forControlEvents:UIControlEventTouchDragInside];
// center and size
button.frame = CGRectMake((self.view.bounds.size.width - 100)/2.0,
(self.view.bounds.size.height - 50)/2.0,
100, 50);
// add it, centered
[self.view addSubview:button];
}
- (void)wasDragged:(UIButton *)button withEvent:(UIEvent *)event
{
// get the touch
UITouch *touch = [[event touchesForView:button] anyObject];
// get delta
CGPoint previousLocation = [touch previousLocationInView:button];
CGPoint location = [touch locationInView:button];
CGFloat delta_x = location.x - previousLocation.x;
CGFloat delta_y = location.y - previousLocation.y;
// move button
button.center = CGPointMake(button.center.x + delta_x,
button.center.y + delta_y);
}
Hope its helpful for you :)

Answer 2

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint pointMoved = [touch locationInView:"SUBVIEWNAME.view"];  
    button.frame = CGRectMake(pointMoved.x, pointMoved.y, 64, 64);
}

Answer 3

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *tap = [touches anyObject];
CGPoint pointToMove = [tap locationInView:yourSubView]; // just assign subview where you want to move the Button
}

Answer 4

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
if([touch view] == YOUR_BUTTON_OBJECT){
CGPoint point = [touch locationInView:YOUR_PARENT_VIEW];
//YOUR_X_LIMIT is your subview end in x direction.
//YOUR_Y_LIMIT is your subview end in y direction.
if(point.x < YOUR_X_LIMIT && point.y < YOUR_Y_LIMIT){
button.center = point;
}else{
// do nothing since touch is outside your limit.
}
}
}

Answer 5

Use UIControlEventTouchDragInside and UIControlEventTouchUpInside events of UIButton like
// add drag listener
[button addTarget:self action:#selector(wasDragged:withEvent:) forControlEvents:UIControlEventTouchDragInside];
// add tap listener
[button addTarget:self action:#selector(wasTapped:) forControlEvents:UIControlEventTouchUpInside];
You can use hbdraggablebutton control..