手写输入法输入 [UIKBBlurredKeyView candidateList]

有用户反应了app在用手写输入法输入的时候，出现了闪退，经过追踪查看，崩溃信息-[UIKBBlurredKeyView candidateList]: unrecognized selector sent to instance 0x177cc850。这个页面由于使用了UIScrollview的category中重写了三个方法：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [[self nextResponder] touchesBegan:touches withEvent:event];
    [super touchesBegan:touches withEvent:event];
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    [[self nextResponder] touchesMoved:touches withEvent:event];
    [super touchesMoved:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [[self nextResponder] touchesEnded:touches withEvent:event];
    [super touchesEnded:touches withEvent:event];
}

我们这三个方法主要是在UIScrollview上处理收键盘的操作，让手势向下传递，于是，对系统的手写键盘造成了影响。解决方法如下：

1.在UIScrollView上面加一个UIView,通过在view上面的手势来改变键盘

UITapGestureRecognizer *tapGr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard:)];
tapGr.cancelsTouchesInView = NO;
[backView addGestureRecognizer:tapGr];

2.在UITableView上改变键盘

UITapGestureRecognizer *tapGr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard:)];
//不加会屏蔽到TableView的点击事件等
tapGr.cancelsTouchesInView = NO;
[tableView addGestureRecognizer:tapGr];