[UIKBBlurredKeyView candidateList]: unrecognized selector sent to instance

错误

app 在线上有个崩溃的问题, crash原因为-[UIKBBlurredKeyView candidateList]: unrecognized selector sent to instance. 

原因

然后发现是在手写输入的时候会crash，原因是在UIScrollview的category中重写了三个方法如下：

-(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];
}

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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];

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2.在UITableView上改变键盘

UITapGestureRecognizer *tapGr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard:)];
//记得加这句，不然会屏蔽到TableView的点击事件等
tapGr.cancelsTouchesInView = NO;
[tableView addGestureRecognizer:tapGr];

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