- (NSUInteger)currentLocation:(UITextView*)textView{
  NSRange range = textView.selectionRange;
  if (range.location == NSNotFound) {
    return textView.text.length;
  }
  return range.location;
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *view = [super hitTest:point withEvent:event];
    if (view == nil) {
        for (UIView *subView in self.subviews) {
            CGPoint tp = [subView convertPoint:point fromView:self];
            if (CGRectContainsPoint(subView.bounds, tp)) {
                view = subView;
            }
        }
    }
    return view;
}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event{
    //if内的条件应该为，触摸点属于子视图范围
    if (.....){
     return YES;
    }
    return NO;
}