关闭键盘的方法

方法一：
//1, 关闭键盘

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

方法二：
//2, 关闭键盘

 [[self findFirstResponderBeneathView:self] resignFirstResponder];

- (UIView*)findFirstResponderBeneathView:(UIView*)view 
{
    // Search recursively for first responder
    for ( UIView *childView in view.subviews ) {
        if ( [childView respondsToSelector:@selector(isFirstResponder)] && [childView isFirstResponder] ) 
            return childView;
        UIView *result = [self findFirstResponderBeneathView:childView];
        if ( result ) 
            return result;
    }
    return nil;
}