P9ViewDragger

You can easily implement dragging view function with P9ViewDragger.

Installation

You can download the latest framework files from our Release page. P9ViewDragger also available through the CocoaPods. You simply add the following line to your Podfile to install. pod ‘P9ViewDragger’

Play

Call trackingView() method as below for dragging, rotating and scaling animations for your UIView.

P9ViewDragger.default().trackingView(yourView, parameters: nil, ready: nil, trackingHandler: nil, completion: nil)

That's all you need to do to drag, rotate and scale for your UIView.

Dragging, Ratating and Scaling features in the P9ViewDragger are enabled by default. You can enable/disable each feature by below.

P9ViewDragger.default().trackingView(someView, parameters: [P9ViewDraggerLockRotateKey:true, P9ViewDraggerLockScaleKey:true], ready: nil, trackingHandler: nil, completion: nil)

Here are reserved parameters you can use.

Parameter Key	value type	description
P9ViewDraggerLockTranslateKey	boolean	enable/disable translate
P9ViewDraggerLockScaleKey	boolean	enable/disable scale
P9ViewDraggerLockRotateKey	boolean	enable/disable rotate
P9ViewDraggerSnapshotImageKey	UIImage	set decoy image view
P9ViewDraggerDecoyViewKey	UIView	set decoy view
P9ViewDraggerRemainDecoyViewOnStageKey	boolean	set false to remove decoy view at the end of the dragging
P9ViewDraggerStartWhenTouchDownKey	boolean	start tracking a view at the touch down event

You can set event handlers for the tracking and completion events in the P9ViewDragger:trackingView() method.

Here is the exmaple below that shows you how to drag your UIView only vertically with it's alpha changes. As you can see in this example, you can be notified at the ready, trackingHandler and completion closers.

P9ViewDragger.default().trackingView(someView, parameters: nil, ready: { [weak self] (trackingView:UIView?) in
    guard let `self` = self else {
        return
    }
    self.someView.alpha = 0.2
}, trackingHandler: { [weak self] (trackingView:UIView?) in
    guard let _ = self, let trackingView = trackingView else {
        return
    }
    var transform = trackingView.transform
    transform.tx = 0
    trackingView.transform = transform
}) { [weak self] (trackingView:UIView?) in
    guard let `self` = self else {
        return
    }
    self.someView.alpha = 1.0
}

You can also use trackingDecoyView() method if you want to move decoy view instead of moving your UIView during the animation.

You don't have to create decoy view by yourself. P9ViewDragger is going to create decoy view for you as a child view of the stageView. If stageView is nil, then defaultStateView in the P9ViewDragger will be used.

P9ViewDragger.default().trackingDecoyView(someView, stageView: stageView, parameters: nil, ready: { [weak self] (trackingView:UIView?) in
    guard let `self` = self else {
        return
    }
    self.someView.alpha = 0.2
}, trackingHandler: nil) { [weak self] (trackingView:UIView?) in
    guard let `self` = self, let trackingView = trackingView else {
        return
    }
    self.someView.alpha = 1.0
    self.someView.transform = trackingView.transform
}

License

MIT License, where applicable. http://en.wikipedia.org/wiki/MIT_License