Running slide for character and stop in an endless runner

How implement running slide for character with a gesture in a mobile game?
How to stop the character in an endless runner holding touch the left side of the touch screen?

sorry for my bad english

You can use progess bar from UMG widget to make the slider. Also you can add button to the left side of the widget and set lower opacity to make it transluscent. Connect your logic to the OnClick event.