textView键盘遮挡问题

-(void)textViewDidBeginEditing:(UITextView *)textView

{

    Text.textColor = [UIColor blackColor];

    CGRect Frame = CGRectMake (8 ,63, 305, 238);

    [Text setFrame: Frame];

//    self.navigationItem.rightBarButtonItem = BARBUTTONDONE(@"Done", @selector(DoneAction:));

}

- (void)textViewDidChange:(UITextView *)textView{

    CGRect Frame = CGRectMake (8 ,63, 305, 160);

    [Text setFrame: Frame];

}

- (void)textViewDidEndEditing:(UITextView *)textView{

    CGRect Frame = CGRectMake (8 ,63, 305, 238);

    [Text setFrame: Frame];

    [Text setContentOffset:CGPointMake(0, 0)];

}