触摸空白收起键盘，不影响tableview的响应

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 1.//    触摸空白收起键盘

    self.view.userInteractionEnabled = YES;

    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(fingerTapped:)];

//  加上这句不会影响你 tableview 上的 action (button,cell selected...)

    singleTap.cancelsTouchesInView = NO;

    [self.view addGestureRecognizer:singleTap];

-(void)fingerTapped:(UITapGestureRecognizer *)gestureRecognizer

{

    [self.view endEditing:YES];

    

}