Determine if UIView is visible to the user?

Question

is it possible to determine whether my UIView is visible to the user or not?

My View is added as subview several times into a Tab Bar

Answer 1

try this:

func isDisplayedInScreen() -> Bool
{
 if (self == nil) {
     return false
  }
    let screenRect = UIScreen.main.bounds 
    // 
    let rect = self.convert(self.frame, from: nil)
    if (rect.isEmpty || rect.isNull) {
        return false
    }
    // 若view 隐藏
    if (self.isHidden) {
        return false
    }

    // 
    if (self.superview == nil) {
        return false
    }
    // 
    if (rect.size.equalTo(CGSize.zero)) {
        return  false
    }
    //
    let intersectionRect = rect.intersection(screenRect)
    if (intersectionRect.isEmpty || intersectionRect.isNull) {
        return false
    }
    return true
}