Dragging a UIView

uipangesturerecognizer_on_a_single_uiview.rb

# Example: UIPanGestureRecognizer on a single UIView

class FooViewController < UIViewController
  def loadView
    # View
    self.view = UIView.alloc.init

    # Block
    blockFrame = CGRectMake(100,100,100,100)
    block = UIView.alloc.initWithFrame(blockFrame)
    block.backgroundColor = UIColor.redColor
    view.addSubview(@block)

    # Pan gesture recognizer
    gestureRecognizer = UIPanGestureRecognizer.alloc.initWithTarget(self, action: 'dragBlock:')
    gestureRecognizer.maximumNumberOfTouches = 1
    block.addGestureRecognizer(gestureRecognizer)
  end

  def dragBlock(gestureRecognizer)
    targetView = gestureRecognizer.view
    translatedPoint = gestureRecognizer.translationInView(targetView)
    movedPoint = CGPointMake(targetView.center.x + translatedPoint.x, targetView.center.y + translatedPoint.y)
    targetView.center = movedPoint
    gestureRecognizer.setTranslation(CGPointZero, inView: targetView)
  end
end