Swift iOS - Detect Touch Drag Enter UIView from outside UIView -

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how event touch, anywhere on screen, draged , enters specific uiview?

how can it, in simple way, in swift ios?

an example of want achieve shown below:

enter image description here

override method of controller 

override func touchesmoved(touches: set<uitouch>, withevent event: uievent?) {      }

than check if touch inside of views rect using function cgrectcontainspoint


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