Move UIView within parent view using pangesture

Question

I want to move a view with in the parent view I am using UIPanGestureRecognizer to move view. I am using below code.

-(void)move:(UIPanGestureRecognizer *)recognizer {
    CGPoint touchLocation = [recognizer locationInView:self.customeView];

    self.view.center = touchLocation;
}

I want to use locationInView to move view instead of translationInView. Can anyone help me how to move the view with in the parentview using locationInView?

Is the problem translating the draggable view's coordinates from the subview to the parent view? Or getting it to move at all? — Kyle Clegg, Dec 08 '16 at 06:26
I have a problem using translationInView so for that I am using locationInView. — Uttam, Dec 08 '16 at 06:52

score 7 · Answer 1 · answered Dec 08 '16 at 06:26

You are on the right track with the UIPanGestureRecognizer. You are likely missing the began and end gesture state handling. Here is a full solution I just put together in sample project (Swift) with a panView as a subclass of the view controller's root view.

class ViewController: UIViewController {

    @IBOutlet weak var panView: UIView!

    // records the view's center for use as an offset while dragging
    var viewCenter: CGPoint!

    override func viewDidLoad() {
        super.viewDidLoad()
        panView.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(self.dragView)))
    }

    func dragView(gesture: UIPanGestureRecognizer) {
        let target = gesture.view!

        switch gesture.state {
        case .began, .ended:
            viewCenter = target.center
        case .changed:
            let translation = gesture.translation(in: self.view)
            target.center = CGPoint(x: viewCenter!.x + translation.x, y: viewCenter!.y + translation.y)
        default: break
        }
    }

}

Thank you for your response @Kyle Clegg, but I want to use locationInView inside UIPanGestureRecognizer method. but you are using translation in view in above code — Uttam, Dec 08 '16 at 06:51

score 2 · Accepted Answer · answered Dec 08 '16 at 07:24

You can try this

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIView *panView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //self.panView = self.panView -> self.view . self.panView is direct child of self.view

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    [self.panView addGestureRecognizer:panRecognizer];


    // Do any additional setup after loading the view, typically from a nib.
}

-(void)move:(UIPanGestureRecognizer *)recognizer {
    CGPoint centerPoint = [recognizer locationInView:self.view];
    self.panView.center = centerPoint;
}
}

how to restrict pan view should be move only in another view (with certain frame ) — Raviteja Mathangi, May 09 '19 at 18:50

Move UIView within parent view using pangesture

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