iOS点击空白区域隐藏键盘

- (void)setupForDismissKeyboard

{

　　NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];

　　UITapGestureRecognizer *singleTagGR = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAnyWhereToDismissKeyboard:)];

　　__weak UIViewController *weakSelf = self;

　　NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];

　　[nc addObserverForName:UIKeyboardWillShowNotification object:nil queue:mainQueue usingBlock:^(NSNotification *note){[weakSelf.view addGestureRecognizer:singleTapGR];}];

　　[nc addObserverForName:UIKeyboardWillShowNotification object:nil queue:mainQueue usingBlock:^(NSNotification *note){[weakSelf.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];

　　[[NSNotificationCenter defaultCenter] postNotificationName:UIKeyboardWillHideNotification object:nil];

}