Move UIView within parent view using pangesture - ios

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?

Answer 1

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
}
}
}

Answer 2

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;
}
}