tableview占整个屏幕，数据只有一条的时候，点击空白地方，关闭键盘的方法

UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapView:)];
//tap 手势一共两个属性，一个是设置轻拍次数，一个是设置点击手指个数
tap1.numberOfTapsRequired = 1;
tap1.numberOfTouchesRequired = 1;
tap1.delegate = self;
[self.view addGestureRecognizer:tap1];

- (void)tapView:(UITapGestureRecognizer *)sender{

[self.searchV endEditing:YES];

}

#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
for (UIView * cell in self.tableView.visibleCells) {
if ([touch.view isDescendantOfView:cell]) {
return NO;
}
}

return YES;
}