iOS 输入框被隐藏，设置view整体上移

//开始编辑时 视图上移 如果输入框不被键盘遮挡则不上移。
-(BOOL)textViewShouldBeginEditing:(UITextView *)textView{
    
    //获取相对于 window 的frame
    CGRect textViewRect = [textView convertRect:textView.frame toView:[UIApplication sharedApplication].keyWindow];
    CGFloat rects = (HEIGHT - CGRectGetMaxY(textViewRect)) - 236;

    NSLog(@"aa%f",rects);
    if (rects <= 0) {
        [UIView animateWithDuration:0.3 animations:^{
            CGRect frame = self.superview.frame;
            frame.origin.y = rects;
            self.superview.frame = frame;
        }];
    }
    return YES;
}

//结束编辑时键盘下去 视图下移动画

-(BOOL)textViewShouldEndEditing:(UITextView *)textView{
    [UIView animateWithDuration:0.3 animations:^{
        CGRect frame = self.superview.frame;
        frame.origin.y = 0.0;
        self.superview.frame = frame;
    }];
    return YES;
}