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Add documentation to README to address modal VC issues #60

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Add documentation to README to address modal VC issues #60

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Expand Up @@ -65,6 +65,15 @@ homeHandle.accessoryViewEdgeInsets = UIEdgeInsets(top: 2, left: 4, bottom: 4, ri
colorPicker.addHandle(homeHandle)
```

#### Using in a Modal Presentation
If you are attempting to use this control in a modally presented view controller in iOS 13+, the built in swipe to dismiss behavior will interfere with this control.

To fix this, you have to add the following to the view controller's `viewDidAppear`
```Swift
presentationController?.presentedView?.gestureRecognizers?[0].isEnabled = false
```
Setting the [`isModalInPresentation` property](https://developer.apple.com/documentation/uikit/uiviewcontroller/3229894-ismodalinpresentation) will not fix the incorrect behavior.

## Installation
### Carthage
```bash
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