if([viewB superview]!=nil)
    NSLog(@"visible");
else
    NSLog(@"not visible");

if([self.childView isDescendantOfView:self.parentView])
{
    // The childView is contained in the parentView.
}

// useful debugging method - send it a view and it will log all subviews
// can be called from the debugger
- (void) viewAllSubviews:(UIView *) topView Indent:(NSString *) indent  {
    for (UIView * theView in [topView subviews]){
        NSLog(@"%@%@", indent, theView);
        if ([theView subviews] != nil)
            [self viewAllSubviews:theView Indent: [NSString stringWithFormat:@"%@ ",indent]];
    }
}

if viewB.superview != nil{
    print("visible")
}
else{
   print("not visible")
}

if selfView.isDescendant(of: self.parentView) {
    print("visible")
}
else{
    print("not visible")
}