点击键盘周边退出键盘

#pragma mark 点击键盘周边退出键盘

[self setUpForDismissKeyboard];//退出键盘

- (void)setUpForDismissKeyboard {

    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];

    UITapGestureRecognizer *singleTapGR =

    [[UITapGestureRecognizer alloc] initWithTarget:self

                                            action:@selector(tapAnywhereToDismissKeyboard:)];

    NSOperationQueue *mainQuene =[NSOperationQueue mainQueue];

    [nc addObserverForName:UIKeyboardWillShowNotification

                    object:nil

                     queue:mainQuene

                usingBlock:^(NSNotification *note){

                    [self.view addGestureRecognizer:singleTapGR];

                }];

    [nc addObserverForName:UIKeyboardWillHideNotification

                    object:nil

                     queue:mainQuene

                usingBlock:^(NSNotification *note){

                    [self.view removeGestureRecognizer:singleTapGR];

                }];

}

- (void)tapAnywhereToDismissKeyboard:(UIGestureRecognizer *)gestureRecognizer {

    //此method会将self.view里所有的subview的first responder都resign掉

    [self.view endEditing:YES];

}